From b1f6a16ff580d97026f2947e029923952d82016b Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Fri, 13 Jan 2023 15:25:59 +0100
Subject: [PATCH 01/18] create device communication api

Signed-off-by: g.dimitropoulos <g.dimitropoulos@sotec.eu>
---
 device-communication/.dockerignore            |   5 +
 device-communication/.gitignore               |  40 +++
 device-communication/.mvn/wrapper/.gitignore  |   1 +
 .../.mvn/wrapper/MavenWrapperDownloader.java  | 121 +++++++
 .../.mvn/wrapper/maven-wrapper.properties     |  18 +
 device-communication/README.md                |  54 +++
 device-communication/mvnw                     | 316 +++++++++++++++++
 device-communication/mvnw.cmd                 | 188 +++++++++++
 device-communication/pom.xml                  | 210 ++++++++++++
 .../src/main/docker/Dockerfile.jvm            |  93 +++++
 .../src/main/docker/Dockerfile.legacy-jar     |  89 +++++
 .../src/main/docker/Dockerfile.native         |  27 ++
 .../src/main/docker/Dockerfile.native-micro   |  30 ++
 .../hono/communication/api/Application.java   |  54 +++
 .../api/DeviceCommunicationHttpServer.java    | 169 ++++++++++
 .../api/config/DeviceCommandConstants.java    |  26 ++
 .../api/config/DeviceConfigsConstants.java    |  30 ++
 .../api/config/EndpointConstants.java         |  25 ++
 .../api/entity/DeviceCommandRequest.java      |  83 +++++
 .../api/entity/DeviceConfig.java              | 129 +++++++
 .../api/entity/DeviceConfigEntity.java        | 136 ++++++++
 .../api/entity/DeviceConfigRequest.java       |  83 +++++
 .../ListDeviceConfigVersionsResponse.java     |  73 ++++
 .../api/handler/DeviceCommandsHandler.java    |  49 +++
 .../api/handler/DeviceConfigsHandler.java     |  78 +++++
 .../api/mapper/DeviceConfigMapper.java        |  48 +++
 .../repository/DeviceConfigsRepository.java   |  34 ++
 .../DeviceConfigsRepositoryImpl.java          | 202 +++++++++++
 .../api/service/DatabaseService.java          |  28 ++
 .../api/service/DatabaseServiceImpl.java      |  66 ++++
 .../api/service/DeviceCommandService.java     |  26 ++
 .../api/service/DeviceCommandServiceImpl.java |  41 +++
 .../api/service/DeviceConfigService.java      |  33 ++
 .../api/service/DeviceConfigServiceImpl.java  |  84 +++++
 .../VertxHttpHandlerManagerService.java       |  44 +++
 .../core/app/AbstractServiceApplication.java  | 160 +++++++++
 .../core/app/ApplicationConfig.java           |  62 ++++
 .../core/app/DatabaseConfig.java              |  84 +++++
 .../communication/core/app/ServerConfig.java  |  48 +++
 .../core/http/AbstractVertxHttpServer.java    |  35 ++
 .../core/http/HttpEndpointHandler.java        |  32 ++
 .../communication/core/http/HttpServer.java   |  34 ++
 .../core/http/HttpServiceBase.java            |  34 ++
 .../communication/core/utils/DbUtils.java     |  50 +++
 .../core/utils/ResponseUtils.java             | 104 ++++++
 .../api/hono-device-communication-v1.yaml     | 206 ++++++++++++
 .../src/main/resources/application.yaml       |  37 ++
 .../resources/db/migration/V1.0__create.sql   |  11 +
 .../communication/api/ApplicationTest.java    |  56 ++++
 .../DeviceCommunicationHttpServerTest.java    | 317 ++++++++++++++++++
 .../handler/DeviceCommandsHandlerTest.java    |  89 +++++
 .../api/handler/DeviceConfigsHandlerTest.java | 238 +++++++++++++
 .../api/service/DatabaseServiceImplTest.java  |  81 +++++
 .../service/DeviceConfigServiceImplTest.java  | 121 +++++++
 .../src/test/resources/application.yaml       |  16 +
 55 files changed, 4548 insertions(+)
 create mode 100644 device-communication/.dockerignore
 create mode 100644 device-communication/.gitignore
 create mode 100644 device-communication/.mvn/wrapper/.gitignore
 create mode 100644 device-communication/.mvn/wrapper/MavenWrapperDownloader.java
 create mode 100644 device-communication/.mvn/wrapper/maven-wrapper.properties
 create mode 100644 device-communication/README.md
 create mode 100644 device-communication/mvnw
 create mode 100644 device-communication/mvnw.cmd
 create mode 100644 device-communication/pom.xml
 create mode 100644 device-communication/src/main/docker/Dockerfile.jvm
 create mode 100644 device-communication/src/main/docker/Dockerfile.legacy-jar
 create mode 100644 device-communication/src/main/docker/Dockerfile.native
 create mode 100644 device-communication/src/main/docker/Dockerfile.native-micro
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpEndpointHandler.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
 create mode 100644 device-communication/src/main/resources/api/hono-device-communication-v1.yaml
 create mode 100644 device-communication/src/main/resources/application.yaml
 create mode 100644 device-communication/src/main/resources/db/migration/V1.0__create.sql
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
 create mode 100644 device-communication/src/test/resources/application.yaml

diff --git a/device-communication/.dockerignore b/device-communication/.dockerignore
new file mode 100644
index 00000000..94810d00
--- /dev/null
+++ b/device-communication/.dockerignore
@@ -0,0 +1,5 @@
+*
+!target/*-runner
+!target/*-runner.jar
+!target/lib/*
+!target/quarkus-app/*
\ No newline at end of file
diff --git a/device-communication/.gitignore b/device-communication/.gitignore
new file mode 100644
index 00000000..693002a0
--- /dev/null
+++ b/device-communication/.gitignore
@@ -0,0 +1,40 @@
+#Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+release.properties
+.flattened-pom.xml
+
+# Eclipse
+.project
+.classpath
+.settings/
+bin/
+
+# IntelliJ
+.idea
+*.ipr
+*.iml
+*.iws
+
+# NetBeans
+nb-configuration.xml
+
+# Visual Studio Code
+.vscode
+.factorypath
+
+# OSX
+.DS_Store
+
+# Vim
+*.swp
+*.swo
+
+# patch
+*.orig
+*.rej
+
+# Local environment
+.env
diff --git a/device-communication/.mvn/wrapper/.gitignore b/device-communication/.mvn/wrapper/.gitignore
new file mode 100644
index 00000000..e72f5e8b
--- /dev/null
+++ b/device-communication/.mvn/wrapper/.gitignore
@@ -0,0 +1 @@
+maven-wrapper.jar
diff --git a/device-communication/.mvn/wrapper/MavenWrapperDownloader.java b/device-communication/.mvn/wrapper/MavenWrapperDownloader.java
new file mode 100644
index 00000000..05212d56
--- /dev/null
+++ b/device-communication/.mvn/wrapper/MavenWrapperDownloader.java
@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+    private static final String WRAPPER_VERSION = "3.1.1";
+
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL =
+            "https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/" + WRAPPER_VERSION
+                    + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to use instead of the
+     * default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH = ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH = ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main(String args[]) {
+        System.out.println("- Downloader started");
+        File baseDirectory = new File(args[0]);
+        System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if (mavenWrapperPropertyFile.exists()) {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try {
+                mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties();
+                mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+            } catch (IOException e) {
+                System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            } finally {
+                try {
+                    if (mavenWrapperPropertyFileInputStream != null) {
+                        mavenWrapperPropertyFileInputStream.close();
+                    }
+                } catch (IOException e) {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println("- Downloading from: " + url);
+
+        File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+        if (!outputFile.getParentFile().exists()) {
+            if (!outputFile.getParentFile().mkdirs()) {
+                System.out.println("- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath()
+                        + "'");
+            }
+        }
+        System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+        try {
+            downloadFileFromURL(url, outputFile);
+            System.out.println("Done");
+            System.exit(0);
+        } catch (Throwable e) {
+            System.out.println("- Error downloading");
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void downloadFileFromURL(String urlString, File destination)
+            throws Exception {
+        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+            String username = System.getenv("MVNW_USERNAME");
+            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+            Authenticator.setDefault(new Authenticator() {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication() {
+                    return new PasswordAuthentication(username, password);
+                }
+            });
+        }
+        URL website = new URL(urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel(website.openStream());
+        FileOutputStream fos = new FileOutputStream(destination);
+        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        fos.close();
+        rbc.close();
+    }
+
+}
diff --git a/device-communication/.mvn/wrapper/maven-wrapper.properties b/device-communication/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 00000000..61a2ef15
--- /dev/null
+++ b/device-communication/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.6/apache-maven-3.8.6-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar
diff --git a/device-communication/README.md b/device-communication/README.md
new file mode 100644
index 00000000..ce13e7f2
--- /dev/null
+++ b/device-communication/README.md
@@ -0,0 +1,54 @@
+# device-communication Project
+
+This project uses Quarkus, the Supersonic Subatomic Java Framework.
+
+If you want to learn more about Quarkus, please visit its website: https://quarkus.io/ .
+
+## Running the application in dev mode
+
+You can run your application in dev mode that enables live coding using:
+
+```shell script
+./mvnw compile quarkus:dev
+```
+
+> **_NOTE:_**  Quarkus now ships with a Dev UI, which is available in dev mode only at http://localhost:8080/q/dev/.
+
+## Packaging and running the application
+
+The application can be packaged using:
+
+```shell script
+./mvnw package
+```
+
+It produces the `quarkus-run.jar` file in the `target/quarkus-app/` directory.
+Be aware that it’s not an _über-jar_ as the dependencies are copied into the `target/quarkus-app/lib/` directory.
+
+The application is now runnable using `java -jar target/quarkus-app/quarkus-run.jar`.
+
+If you want to build an _über-jar_, execute the following command:
+
+```shell script
+./mvnw package -Dquarkus.package.type=uber-jar
+```
+
+The application, packaged as an _über-jar_, is now runnable using `java -jar target/*-runner.jar`.
+
+## Creating a native executable
+
+You can create a native executable using:
+
+```shell script
+./mvnw package -Pnative
+```
+
+Or, if you don't have GraalVM installed, you can run the native executable build in a container using:
+
+```shell script
+./mvnw package -Pnative -Dquarkus.native.container-build=true
+```
+
+You can then execute your native executable with: `./target/device-communication-1.0-SNAPSHOT-runner`
+
+If you want to learn more about building native executables, please consult https://quarkus.io/guides/maven-tooling.
diff --git a/device-communication/mvnw b/device-communication/mvnw
new file mode 100644
index 00000000..eaa3d308
--- /dev/null
+++ b/device-communication/mvnw
@@ -0,0 +1,316 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
diff --git a/device-communication/mvnw.cmd b/device-communication/mvnw.cmd
new file mode 100644
index 00000000..abb7c324
--- /dev/null
+++ b/device-communication/mvnw.cmd
@@ -0,0 +1,188 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%
diff --git a/device-communication/pom.xml b/device-communication/pom.xml
new file mode 100644
index 00000000..3bbf3801
--- /dev/null
+++ b/device-communication/pom.xml
@@ -0,0 +1,210 @@
+<?xml version="1.0"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
+         xmlns="http://maven.apache.org/POM/4.0.0">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.eclipse.hono</groupId>
+    <artifactId>device-communication</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <properties>
+        <compiler-plugin.version>3.10.1</compiler-plugin.version>
+        <maven.compiler.release>17</maven.compiler.release>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
+        <quarkus.platform.group-id>io.quarkus.platform</quarkus.platform.group-id>
+        <quarkus.platform.version>2.15.3.Final</quarkus.platform.version>
+        <skipITs>true</skipITs>
+        <surefire-plugin.version>3.0.0-M7</surefire-plugin.version>
+        <org.mapstruct.version>1.5.3.Final</org.mapstruct.version>
+    </properties>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>${quarkus.platform.group-id}</groupId>
+                <artifactId>${quarkus.platform.artifact-id}</artifactId>
+                <version>${quarkus.platform.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+    <dependencies>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-arc</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-junit5</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-vertx</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-web-openapi</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-web-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-config-yaml</artifactId>
+        </dependency>
+
+        <!-- Flyway specific dependencies -->
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-flyway</artifactId>
+        </dependency>
+
+        <!-- JDBC driver dependencies -->
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-jdbc-postgresql</artifactId>
+        </dependency>
+
+
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-pg-client</artifactId>
+            <version>4.3.7</version>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.persistence</groupId>
+            <artifactId>jakarta.persistence-api</artifactId>
+            <version>2.2.3</version>
+        </dependency>
+        <dependency>
+            <groupId>com.ongres.scram</groupId>
+            <artifactId>client</artifactId>
+            <version>2.1</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/io.vertx/vertx-sql-client-templates -->
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-sql-client-templates</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mapstruct</groupId>
+            <artifactId>mapstruct</artifactId>
+            <version>${org.mapstruct.version}</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${compiler-plugin.version}</version>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.mapstruct</groupId>
+                            <artifactId>mapstruct-processor</artifactId>
+                            <version>${org.mapstruct.version}</version>
+                        </path>
+
+                        <path>
+                            <groupId>io.quarkus</groupId>
+                            <artifactId>quarkus-extension-processor</artifactId>
+                            <version>${quarkus.platform.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>${quarkus.platform.group-id}</groupId>
+                <artifactId>quarkus-maven-plugin</artifactId>
+                <version>${quarkus.platform.version}</version>
+                <extensions>true</extensions>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>build</goal>
+                            <goal>generate-code</goal>
+                            <goal>generate-code-tests</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${compiler-plugin.version}</version>
+                <configuration>
+                    <compilerArgs>
+                        <arg>-parameters</arg>
+                    </compilerArgs>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${surefire-plugin.version}</version>
+                <configuration>
+
+                    <systemPropertyVariables>
+                        <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
+                        <maven.home>${maven.home}</maven.home>
+                    </systemPropertyVariables>
+
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <version>${surefire-plugin.version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>integration-test</goal>
+                            <goal>verify</goal>
+                        </goals>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <native.image.path>${project.build.directory}/${project.build.finalName}-runner
+                                </native.image.path>
+                                <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
+                                <maven.home>${maven.home}</maven.home>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+    <profiles>
+        <profile>
+            <id>native</id>
+            <activation>
+                <property>
+                    <name>native</name>
+                </property>
+            </activation>
+            <properties>
+                <skipITs>false</skipITs>
+                <quarkus.package.type>native</quarkus.package.type>
+            </properties>
+        </profile>
+    </profiles>
+</project>
diff --git a/device-communication/src/main/docker/Dockerfile.jvm b/device-communication/src/main/docker/Dockerfile.jvm
new file mode 100644
index 00000000..c5a55161
--- /dev/null
+++ b/device-communication/src/main/docker/Dockerfile.jvm
@@ -0,0 +1,93 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in JVM mode
+#
+# Before building the container image run:
+#
+# ./mvnw package
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.jvm -t quarkus/device-communication-jvm .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/device-communication-jvm
+#
+# If you want to include the debug port into your docker image
+# you will have to expose the debug port (default 5005) like this :  EXPOSE 8080 5005
+#
+# Then run the container using :
+#
+# docker run -i --rm -p 8080:8080 quarkus/device-communication-jvm
+#
+# This image uses the `run-java.sh` script to run the application.
+# This scripts computes the command line to execute your Java application, and
+# includes memory/GC tuning.
+# You can configure the behavior using the following environment properties:
+# - JAVA_OPTS: JVM options passed to the `java` command (example: "-verbose:class")
+# - JAVA_OPTS_APPEND: User specified Java options to be appended to generated options
+#   in JAVA_OPTS (example: "-Dsome.property=foo")
+# - JAVA_MAX_MEM_RATIO: Is used when no `-Xmx` option is given in JAVA_OPTS. This is
+#   used to calculate a default maximal heap memory based on a containers restriction.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xmx` is set to a ratio
+#   of the container available memory as set here. The default is `50` which means 50%
+#   of the available memory is used as an upper boundary. You can skip this mechanism by
+#   setting this value to `0` in which case no `-Xmx` option is added.
+# - JAVA_INITIAL_MEM_RATIO: Is used when no `-Xms` option is given in JAVA_OPTS. This
+#   is used to calculate a default initial heap memory based on the maximum heap memory.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xms` is set to a ratio
+#   of the `-Xmx` memory as set here. The default is `25` which means 25% of the `-Xmx`
+#   is used as the initial heap size. You can skip this mechanism by setting this value
+#   to `0` in which case no `-Xms` option is added (example: "25")
+# - JAVA_MAX_INITIAL_MEM: Is used when no `-Xms` option is given in JAVA_OPTS.
+#   This is used to calculate the maximum value of the initial heap memory. If used in
+#   a container without any memory constraints for the container then this option has
+#   no effect. If there is a memory constraint then `-Xms` is limited to the value set
+#   here. The default is 4096MB which means the calculated value of `-Xms` never will
+#   be greater than 4096MB. The value of this variable is expressed in MB (example: "4096")
+# - JAVA_DIAGNOSTICS: Set this to get some diagnostics information to standard output
+#   when things are happening. This option, if set to true, will set
+#  `-XX:+UnlockDiagnosticVMOptions`. Disabled by default (example: "true").
+# - JAVA_DEBUG: If set remote debugging will be switched on. Disabled by default (example:
+#    true").
+# - JAVA_DEBUG_PORT: Port used for remote debugging. Defaults to 5005 (example: "8787").
+# - CONTAINER_CORE_LIMIT: A calculated core limit as described in
+#   https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt. (example: "2")
+# - CONTAINER_MAX_MEMORY: Memory limit given to the container (example: "1024").
+# - GC_MIN_HEAP_FREE_RATIO: Minimum percentage of heap free after GC to avoid expansion.
+#   (example: "20")
+# - GC_MAX_HEAP_FREE_RATIO: Maximum percentage of heap free after GC to avoid shrinking.
+#   (example: "40")
+# - GC_TIME_RATIO: Specifies the ratio of the time spent outside the garbage collection.
+#   (example: "4")
+# - GC_ADAPTIVE_SIZE_POLICY_WEIGHT: The weighting given to the current GC time versus
+#   previous GC times. (example: "90")
+# - GC_METASPACE_SIZE: The initial metaspace size. (example: "20")
+# - GC_MAX_METASPACE_SIZE: The maximum metaspace size. (example: "100")
+# - GC_CONTAINER_OPTIONS: Specify Java GC to use. The value of this variable should
+#   contain the necessary JRE command-line options to specify the required GC, which
+#   will override the default of `-XX:+UseParallelGC` (example: -XX:+UseG1GC).
+# - HTTPS_PROXY: The location of the https proxy. (example: "myuser@127.0.0.1:8080")
+# - HTTP_PROXY: The location of the http proxy. (example: "myuser@127.0.0.1:8080")
+# - NO_PROXY: A comma separated lists of hosts, IP addresses or domains that can be
+#   accessed directly. (example: "foo.example.com,bar.example.com")
+#
+###
+FROM registry.access.redhat.com/ubi8/openjdk-17:1.14
+
+ENV LANGUAGE='en_US:en'
+
+
+# We make four distinct layers so if there are application changes the library layers can be re-used
+COPY --chown=185 target/quarkus-app/lib/ /deployments/lib/
+COPY --chown=185 target/quarkus-app/*.jar /deployments/
+COPY --chown=185 target/quarkus-app/app/ /deployments/app/
+COPY --chown=185 target/quarkus-app/quarkus/ /deployments/quarkus/
+
+EXPOSE 8080
+USER 185
+ENV JAVA_OPTS="-Dquarkus.http.host=0.0.0.0 -Djava.util.logging.manager=org.jboss.logmanager.LogManager"
+ENV JAVA_APP_JAR="/deployments/quarkus-run.jar"
+
diff --git a/device-communication/src/main/docker/Dockerfile.legacy-jar b/device-communication/src/main/docker/Dockerfile.legacy-jar
new file mode 100644
index 00000000..e1a0c7e6
--- /dev/null
+++ b/device-communication/src/main/docker/Dockerfile.legacy-jar
@@ -0,0 +1,89 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in JVM mode
+#
+# Before building the container image run:
+#
+# ./mvnw package -Dquarkus.package.type=legacy-jar
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.legacy-jar -t quarkus/device-communication-legacy-jar .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/device-communication-legacy-jar
+#
+# If you want to include the debug port into your docker image
+# you will have to expose the debug port (default 5005) like this :  EXPOSE 8080 5005
+#
+# Then run the container using :
+#
+# docker run -i --rm -p 8080:8080 quarkus/device-communication-legacy-jar
+#
+# This image uses the `run-java.sh` script to run the application.
+# This scripts computes the command line to execute your Java application, and
+# includes memory/GC tuning.
+# You can configure the behavior using the following environment properties:
+# - JAVA_OPTS: JVM options passed to the `java` command (example: "-verbose:class")
+# - JAVA_OPTS_APPEND: User specified Java options to be appended to generated options
+#   in JAVA_OPTS (example: "-Dsome.property=foo")
+# - JAVA_MAX_MEM_RATIO: Is used when no `-Xmx` option is given in JAVA_OPTS. This is
+#   used to calculate a default maximal heap memory based on a containers restriction.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xmx` is set to a ratio
+#   of the container available memory as set here. The default is `50` which means 50%
+#   of the available memory is used as an upper boundary. You can skip this mechanism by
+#   setting this value to `0` in which case no `-Xmx` option is added.
+# - JAVA_INITIAL_MEM_RATIO: Is used when no `-Xms` option is given in JAVA_OPTS. This
+#   is used to calculate a default initial heap memory based on the maximum heap memory.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xms` is set to a ratio
+#   of the `-Xmx` memory as set here. The default is `25` which means 25% of the `-Xmx`
+#   is used as the initial heap size. You can skip this mechanism by setting this value
+#   to `0` in which case no `-Xms` option is added (example: "25")
+# - JAVA_MAX_INITIAL_MEM: Is used when no `-Xms` option is given in JAVA_OPTS.
+#   This is used to calculate the maximum value of the initial heap memory. If used in
+#   a container without any memory constraints for the container then this option has
+#   no effect. If there is a memory constraint then `-Xms` is limited to the value set
+#   here. The default is 4096MB which means the calculated value of `-Xms` never will
+#   be greater than 4096MB. The value of this variable is expressed in MB (example: "4096")
+# - JAVA_DIAGNOSTICS: Set this to get some diagnostics information to standard output
+#   when things are happening. This option, if set to true, will set
+#  `-XX:+UnlockDiagnosticVMOptions`. Disabled by default (example: "true").
+# - JAVA_DEBUG: If set remote debugging will be switched on. Disabled by default (example:
+#    true").
+# - JAVA_DEBUG_PORT: Port used for remote debugging. Defaults to 5005 (example: "8787").
+# - CONTAINER_CORE_LIMIT: A calculated core limit as described in
+#   https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt. (example: "2")
+# - CONTAINER_MAX_MEMORY: Memory limit given to the container (example: "1024").
+# - GC_MIN_HEAP_FREE_RATIO: Minimum percentage of heap free after GC to avoid expansion.
+#   (example: "20")
+# - GC_MAX_HEAP_FREE_RATIO: Maximum percentage of heap free after GC to avoid shrinking.
+#   (example: "40")
+# - GC_TIME_RATIO: Specifies the ratio of the time spent outside the garbage collection.
+#   (example: "4")
+# - GC_ADAPTIVE_SIZE_POLICY_WEIGHT: The weighting given to the current GC time versus
+#   previous GC times. (example: "90")
+# - GC_METASPACE_SIZE: The initial metaspace size. (example: "20")
+# - GC_MAX_METASPACE_SIZE: The maximum metaspace size. (example: "100")
+# - GC_CONTAINER_OPTIONS: Specify Java GC to use. The value of this variable should
+#   contain the necessary JRE command-line options to specify the required GC, which
+#   will override the default of `-XX:+UseParallelGC` (example: -XX:+UseG1GC).
+# - HTTPS_PROXY: The location of the https proxy. (example: "myuser@127.0.0.1:8080")
+# - HTTP_PROXY: The location of the http proxy. (example: "myuser@127.0.0.1:8080")
+# - NO_PROXY: A comma separated lists of hosts, IP addresses or domains that can be
+#   accessed directly. (example: "foo.example.com,bar.example.com")
+#
+###
+FROM registry.access.redhat.com/ubi8/openjdk-17:1.14
+
+ENV LANGUAGE='en_US:en'
+
+
+COPY target/lib/* /deployments/lib/
+COPY target/*-runner.jar /deployments/quarkus-run.jar
+
+EXPOSE 8080
+USER 185
+ENV JAVA_OPTS="-Dquarkus.http.host=0.0.0.0 -Djava.util.logging.manager=org.jboss.logmanager.LogManager"
+ENV JAVA_APP_JAR="/deployments/quarkus-run.jar"
diff --git a/device-communication/src/main/docker/Dockerfile.native b/device-communication/src/main/docker/Dockerfile.native
new file mode 100644
index 00000000..9dd59a05
--- /dev/null
+++ b/device-communication/src/main/docker/Dockerfile.native
@@ -0,0 +1,27 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in native (no JVM) mode.
+#
+# Before building the container image run:
+#
+# ./mvnw package -Pnative
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.native -t quarkus/device-communication .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/device-communication
+#
+###
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.6
+WORKDIR /work/
+RUN chown 1001 /work \
+    && chmod "g+rwX" /work \
+    && chown 1001:root /work
+COPY --chown=1001:root target/*-runner /work/application
+
+EXPOSE 8080
+USER 1001
+
+CMD ["./application", "-Dquarkus.http.host=0.0.0.0"]
diff --git a/device-communication/src/main/docker/Dockerfile.native-micro b/device-communication/src/main/docker/Dockerfile.native-micro
new file mode 100644
index 00000000..44595bbb
--- /dev/null
+++ b/device-communication/src/main/docker/Dockerfile.native-micro
@@ -0,0 +1,30 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in native (no JVM) mode.
+# It uses a micro base image, tuned for Quarkus native executables.
+# It reduces the size of the resulting container image.
+# Check https://quarkus.io/guides/quarkus-runtime-base-image for further information about this image.
+#
+# Before building the container image run:
+#
+# ./mvnw package -Pnative
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.native-micro -t quarkus/device-communication .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/device-communication
+#
+###
+FROM quay.io/quarkus/quarkus-micro-image:1.0
+WORKDIR /work/
+RUN chown 1001 /work \
+    && chmod "g+rwX" /work \
+    && chown 1001:root /work
+COPY --chown=1001:root target/*-runner /work/application
+
+EXPOSE 8080
+USER 1001
+
+CMD ["./application", "-Dquarkus.http.host=0.0.0.0"]
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java
new file mode 100644
index 00000000..6fbbd88f
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java
@@ -0,0 +1,54 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api;
+
+import io.vertx.core.Vertx;
+import org.eclipse.hono.communication.core.app.AbstractServiceApplication;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.http.HttpServer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Device Communication application
+ */
+public class Application extends AbstractServiceApplication {
+
+    private final Logger log = LoggerFactory.getLogger(AbstractServiceApplication.class);
+    private final HttpServer server;
+
+    public Application(Vertx vertx,
+                       ApplicationConfig appConfigs,
+                       HttpServer server) {
+        super(vertx, appConfigs);
+        this.server = server;
+    }
+
+    @Override
+    public void doStart() {
+        log.info("Starting HTTP server...");
+        server.start();
+    }
+
+    @Override
+    public void doStop() {
+        log.info("Stopping HTTP server...");
+        server.stop();
+    }
+
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
new file mode 100644
index 00000000..95086423
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -0,0 +1,169 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api;
+
+import io.netty.handler.codec.http.HttpHeaderNames;
+import io.quarkus.runtime.Quarkus;
+import io.vertx.core.Vertx;
+import io.vertx.core.http.HttpMethod;
+import io.vertx.core.http.HttpServerOptions;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import io.vertx.ext.web.validation.BadRequestException;
+import org.eclipse.hono.communication.api.service.DatabaseService;
+import org.eclipse.hono.communication.api.service.VertxHttpHandlerManagerService;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.http.AbstractVertxHttpServer;
+import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
+import org.eclipse.hono.communication.core.http.HttpServer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.inject.Singleton;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Vertx HTTP Server for the device communication api
+ */
+@Singleton
+public class DeviceCommunicationHttpServer extends AbstractVertxHttpServer implements HttpServer {
+    private final Logger log = LoggerFactory.getLogger(DeviceCommunicationHttpServer.class);
+    private final String serverStartedMsg = "HTTP Server is listening at http://{}:{}";
+    private final String serverFailedMsg = "HTTP Server failed to start: {}";
+    private final VertxHttpHandlerManagerService httpHandlerManager;
+
+    private final DatabaseService db;
+    private List<HttpEndpointHandler> httpEndpointHandlers;
+
+
+    public DeviceCommunicationHttpServer(ApplicationConfig appConfigs,
+                                         Vertx vertx,
+                                         VertxHttpHandlerManagerService httpHandlerManager,
+                                         DatabaseService databaseService) {
+        super(appConfigs, vertx);
+        this.httpHandlerManager = httpHandlerManager;
+        this.httpEndpointHandlers = new ArrayList<>();
+        this.db = databaseService;
+    }
+
+
+    @Override
+    public void start() {
+        this.httpEndpointHandlers = httpHandlerManager.getAvailableHandlerServices();
+        RouterBuilder.create(this.vertx, appConfigs.getServerConfig().getOpenApiFilePath())
+                .onSuccess(routerBuilder ->
+                {
+
+                    Router apiRouter = this.createRouterWithEndpoints(routerBuilder, httpEndpointHandlers);
+                    this.startVertxServer(apiRouter);
+                })
+                .onFailure(error -> {
+                    if (error != null) {
+                        log.error(error.getMessage());
+                    } else {
+                        log.error("Can not create Router");
+                    }
+
+                });
+
+        // Wait until application is stopped
+        Quarkus.waitForExit();
+
+    }
+
+    /**
+     * Creates the Router object and adds endpoints and handlers
+     *
+     * @param routerBuilder        Vertx RouterBuilder object
+     * @param httpEndpointHandlers All available http endpoint handlers
+     * @return The created Router object
+     */
+    Router createRouterWithEndpoints(RouterBuilder routerBuilder, List<HttpEndpointHandler> httpEndpointHandlers) {
+        for (HttpEndpointHandler handlerService : httpEndpointHandlers) {
+            handlerService.addRoutes(routerBuilder);
+        }
+
+        return routerBuilder.createRouter();
+    }
+
+    /**
+     * Starts the server and blocks until application is stopped
+     *
+     * @param router The Router object
+     */
+    void startVertxServer(Router router) {
+        var serverConfigs = appConfigs.getServerConfig();
+        var serverOptions = new HttpServerOptions()
+                .setPort(serverConfigs.getServerPort())
+                .setHost(serverConfigs.getServerUrl());
+
+        var serverCreationFuture = vertx
+                .createHttpServer(serverOptions)
+                .requestHandler(router)
+                .listen();
+
+        serverCreationFuture
+                .onSuccess(server -> log.info(this.serverStartedMsg, serverConfigs.getServerUrl()
+                        , serverConfigs.getServerPort()))
+                .onFailure(error -> log.info(this.serverFailedMsg, error.getMessage()));
+    }
+
+    /**
+     * Adds status code 400 and sets the error message for the routingContext response.
+     *
+     * @param routingContext the routing context object
+     * @Throws: NullPointerException – if routingContext is {@code null}.
+     */
+    void addDefault400ExceptionHandler(RoutingContext routingContext) {
+        Objects.requireNonNull(routingContext);
+        String errorMsg = ((BadRequestException) routingContext.failure()).toJson().toString();
+        log.error(errorMsg);
+        routingContext.response().setStatusCode(400).end(errorMsg);
+    }
+
+    /**
+     * Adds status code 404 and sets the error message for the routingContext response.
+     *
+     * @param routingContext the routing context object
+     * @Throws: NullPointerException – if routingContext is {@code null}.
+     */
+    void addDefault404ExceptionHandler(RoutingContext routingContext) {
+        Objects.requireNonNull(routingContext);
+        if (!routingContext.response().ended()) {
+            routingContext.response().setStatusCode(404);
+
+            if (!routingContext.request().method().equals(HttpMethod.HEAD)) {
+                routingContext.response()
+                        .putHeader(HttpHeaderNames.CONTENT_TYPE, "text/html; charset=utf-8")
+                        .end("<html><body><h1>Resource not found</h1></body></html>");
+            } else {
+                routingContext.response().end();
+            }
+        }
+    }
+
+
+    @Override
+    public void stop() {
+        // stop server custom functionality
+        db.close();
+
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java
new file mode 100644
index 00000000..2e1f3c2f
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java
@@ -0,0 +1,26 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.config;
+
+/**
+ * Device commands constant values
+ */
+public class DeviceCommandConstants {
+
+    // Open api operationIds
+    public final static String POST_DEVICE_COMMAND_OP_ID = "postCommand";
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
new file mode 100644
index 00000000..b12e3ddf
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
@@ -0,0 +1,30 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.config;
+
+/**
+ * Device configs constant values
+ */
+public class DeviceConfigsConstants {
+
+    // Open api operationIds
+    public final static String POST_MODIFY_DEVICE_CONFIG_OP_ID = "modifyCloudToDeviceConfig";
+    public final static String LIST_CONFIG_VERSIONS_OP_ID = "listConfigVersions";
+    public final static String TENANT_PATH_PARAMETER = "tenantid";
+    public final static String DEVICE_PATH_PARAMETER = "deviceid";
+    public final static String NUM_VERSION_QUERY_PARAMS = "numVersions";
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java
new file mode 100644
index 00000000..15d04f4c
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java
@@ -0,0 +1,25 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.config;
+
+/**
+ * Class for sharing api constant values
+ */
+public class EndpointConstants {
+
+    // Device
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java
new file mode 100644
index 00000000..23b12f65
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java
@@ -0,0 +1,83 @@
+package org.eclipse.hono.communication.api.entity;
+
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Command json object structure
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class DeviceCommandRequest   {
+  
+  private String binaryData;
+  private String subfolder;
+
+  public DeviceCommandRequest () {
+
+  }
+
+  public DeviceCommandRequest (String binaryData, String subfolder) {
+    this.binaryData = binaryData;
+    this.subfolder = subfolder;
+  }
+
+    
+  @JsonProperty("binaryData")
+  public String getBinaryData() {
+    return binaryData;
+  }
+  public void setBinaryData(String binaryData) {
+    this.binaryData = binaryData;
+  }
+
+    
+  @JsonProperty("subfolder")
+  public String getSubfolder() {
+    return subfolder;
+  }
+  public void setSubfolder(String subfolder) {
+    this.subfolder = subfolder;
+  }
+
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    DeviceCommandRequest deviceCommandRequest = (DeviceCommandRequest) o;
+    return Objects.equals(binaryData, deviceCommandRequest.binaryData) &&
+        Objects.equals(subfolder, deviceCommandRequest.subfolder);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(binaryData, subfolder);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class DeviceCommandRequest {\n");
+    
+    sb.append("    binaryData: ").append(toIndentedString(binaryData)).append("\n");
+    sb.append("    subfolder: ").append(toIndentedString(subfolder)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java
new file mode 100644
index 00000000..fa2590af
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java
@@ -0,0 +1,129 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.entity;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.Objects;
+
+/**
+ * The device configuration.
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class DeviceConfig {
+
+    private String version;
+    private String cloudUpdateTime;
+    private String deviceAckTime;
+    private String binaryData;
+
+    public DeviceConfig() {
+
+    }
+
+    public DeviceConfig(String version, String cloudUpdateTime, String deviceAckTime, String binaryData) {
+        this.version = version;
+        this.cloudUpdateTime = cloudUpdateTime;
+        this.deviceAckTime = deviceAckTime;
+        this.binaryData = binaryData;
+    }
+
+
+    @JsonProperty("version")
+    public String getVersion() {
+        return version;
+    }
+
+    public void setVersion(String version) {
+        this.version = version;
+    }
+
+
+    @JsonProperty("cloudUpdateTime")
+    public String getCloudUpdateTime() {
+        return cloudUpdateTime;
+    }
+
+    public void setCloudUpdateTime(String cloudUpdateTime) {
+        this.cloudUpdateTime = cloudUpdateTime;
+    }
+
+
+    @JsonProperty("deviceAckTime")
+    public String getDeviceAckTime() {
+        return deviceAckTime;
+    }
+
+    public void setDeviceAckTime(String deviceAckTime) {
+        this.deviceAckTime = deviceAckTime;
+    }
+
+
+    @JsonProperty("binaryData")
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DeviceConfig deviceConfig = (DeviceConfig) o;
+        return Objects.equals(version, deviceConfig.version) &&
+                Objects.equals(cloudUpdateTime, deviceConfig.cloudUpdateTime) &&
+                Objects.equals(deviceAckTime, deviceConfig.deviceAckTime) &&
+                Objects.equals(binaryData, deviceConfig.binaryData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(version, cloudUpdateTime, deviceAckTime, binaryData);
+    }
+
+    @Override
+    public String toString() {
+
+        String sb = "class DeviceConfig {\n" +
+                "    version: " + toIndentedString(version) + "\n" +
+                "    cloudUpdateTime: " + toIndentedString(cloudUpdateTime) + "\n" +
+                "    deviceAckTime: " + toIndentedString(deviceAckTime) + "\n" +
+                "    binaryData: " + toIndentedString(binaryData) + "\n" +
+                "}";
+        return sb;
+    }
+
+    /**
+     * Convert the given object to string with each line indented by 4 spaces
+     * (except the first line).
+     */
+    private String toIndentedString(Object o) {
+        if (o == null) {
+            return "null";
+        }
+        return o.toString().replace("\n", "\n    ");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java
new file mode 100644
index 00000000..3008d5e7
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java
@@ -0,0 +1,136 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.entity;
+
+import java.util.Objects;
+
+/**
+ * The device configuration entity object.
+ **/
+public class DeviceConfigEntity {
+
+
+    private int version;
+    private String tenantId;
+    private String deviceId;
+
+    private String cloudUpdateTime;
+    private String deviceAckTime;
+    private String binaryData;
+
+    public DeviceConfigEntity(int version,
+                              String tenantId,
+                              String deviceId,
+                              String cloudUpdateTime,
+                              String deviceAckTime,
+                              String binaryData) {
+        this.version = version;
+        this.tenantId = tenantId;
+        this.deviceId = deviceId;
+        this.cloudUpdateTime = cloudUpdateTime;
+        this.deviceAckTime = deviceAckTime;
+        this.binaryData = binaryData;
+    }
+
+    public DeviceConfigEntity(String tenantId, String deviceId, DeviceConfig deviceConfig) {
+        this.version = Integer.parseInt(deviceConfig.getVersion());
+        this.cloudUpdateTime = deviceConfig.getCloudUpdateTime();
+        this.deviceAckTime = deviceConfig.getDeviceAckTime();
+        this.binaryData = deviceConfig.getBinaryData();
+    }
+
+    public DeviceConfigEntity() {
+    }
+
+
+    public int getVersion() {
+        return version;
+    }
+
+    public void setVersion(int version) {
+        this.version = version;
+    }
+
+    public String getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(String tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public String getDeviceId() {
+        return deviceId;
+    }
+
+    public void setDeviceId(String deviceId) {
+        this.deviceId = deviceId;
+    }
+
+
+    public String getCloudUpdateTime() {
+        return cloudUpdateTime;
+    }
+
+    public void setCloudUpdateTime(String cloudUpdateTime) {
+        this.cloudUpdateTime = cloudUpdateTime;
+    }
+
+    public String getDeviceAckTime() {
+        return deviceAckTime;
+    }
+
+    public void setDeviceAckTime(String deviceAckTime) {
+        this.deviceAckTime = deviceAckTime;
+    }
+
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @Override
+    public String toString() {
+        return "DeviceConfigEntity{" +
+                "version=" + version +
+                ", tenantId='" + tenantId + '\'' +
+                ", deviceId='" + deviceId + '\'' +
+                ", cloudUpdateTime='" + cloudUpdateTime + '\'' +
+                ", deviceAckTime='" + deviceAckTime + '\'' +
+                ", binaryData='" + binaryData + '\'' +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DeviceConfigEntity that = (DeviceConfigEntity) o;
+        return version == that.version && tenantId.equals(that.tenantId) && deviceId.equals(that.deviceId) && cloudUpdateTime.equals(that.cloudUpdateTime) && Objects.equals(deviceAckTime, that.deviceAckTime) && binaryData.equals(that.binaryData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(version, tenantId, deviceId, cloudUpdateTime, deviceAckTime, binaryData);
+    }
+
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java
new file mode 100644
index 00000000..c1913b0d
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java
@@ -0,0 +1,83 @@
+package org.eclipse.hono.communication.api.entity;
+
+import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Request body for modifying device configs
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class DeviceConfigRequest   {
+  
+  private String versionToUpdate;
+  private String binaryData;
+
+  public DeviceConfigRequest () {
+
+  }
+
+  public DeviceConfigRequest (String versionToUpdate, String binaryData) {
+    this.versionToUpdate = versionToUpdate;
+    this.binaryData = binaryData;
+  }
+
+    
+  @JsonProperty("versionToUpdate")
+  public String getVersionToUpdate() {
+    return versionToUpdate;
+  }
+  public void setVersionToUpdate(String versionToUpdate) {
+    this.versionToUpdate = versionToUpdate;
+  }
+
+    
+  @JsonProperty("binaryData")
+  public String getBinaryData() {
+    return binaryData;
+  }
+  public void setBinaryData(String binaryData) {
+    this.binaryData = binaryData;
+  }
+
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    DeviceConfigRequest deviceConfigRequest = (DeviceConfigRequest) o;
+    return Objects.equals(versionToUpdate, deviceConfigRequest.versionToUpdate) &&
+        Objects.equals(binaryData, deviceConfigRequest.binaryData);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(versionToUpdate, binaryData);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class DeviceConfigRequest {\n");
+    
+    sb.append("    versionToUpdate: ").append(toIndentedString(versionToUpdate)).append("\n");
+    sb.append("    binaryData: ").append(toIndentedString(binaryData)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java
new file mode 100644
index 00000000..892d4001
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java
@@ -0,0 +1,73 @@
+package org.eclipse.hono.communication.api.entity;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * A list of a device config versions
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class ListDeviceConfigVersionsResponse {
+
+    private List<DeviceConfig> deviceConfigs = new ArrayList<>();
+
+    public ListDeviceConfigVersionsResponse() {
+
+    }
+
+    public ListDeviceConfigVersionsResponse(List<DeviceConfig> deviceConfigs) {
+        this.deviceConfigs = deviceConfigs;
+    }
+
+
+    @JsonProperty("deviceConfigs")
+    public List<DeviceConfig> getDeviceConfigs() {
+        return deviceConfigs;
+    }
+
+    public void setDeviceConfigs(List<DeviceConfig> deviceConfigs) {
+        this.deviceConfigs = deviceConfigs;
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = (ListDeviceConfigVersionsResponse) o;
+        return Objects.equals(deviceConfigs, listDeviceConfigVersionsResponse.deviceConfigs);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(deviceConfigs);
+    }
+
+    @Override
+    public String toString() {
+
+        String sb = "class ListDeviceConfigVersionsResponse {\n" +
+                "    deviceConfigs: " + toIndentedString(deviceConfigs) + "\n" +
+                "}";
+        return sb;
+    }
+
+    /**
+     * Convert the given object to string with each line indented by 4 spaces
+     * (except the first line).
+     */
+    private String toIndentedString(Object o) {
+        if (o == null) {
+            return "null";
+        }
+        return o.toString().replace("\n", "\n    ");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
new file mode 100644
index 00000000..ef6e1f44
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
@@ -0,0 +1,49 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.handler;
+
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import org.eclipse.hono.communication.api.config.DeviceCommandConstants;
+import org.eclipse.hono.communication.api.service.DeviceCommandService;
+import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
+
+import javax.enterprise.context.ApplicationScoped;
+
+/**
+ * Handler for device command endpoints
+ */
+@ApplicationScoped
+public class DeviceCommandsHandler implements HttpEndpointHandler {
+
+    private final DeviceCommandService commandService;
+
+    public DeviceCommandsHandler(DeviceCommandService commandService) {
+        this.commandService = commandService;
+    }
+
+    @Override
+    public void addRoutes(RouterBuilder routerBuilder) {
+        routerBuilder.operation(DeviceCommandConstants.POST_DEVICE_COMMAND_OP_ID)
+                .handler(this::handlePostCommand);
+    }
+
+    public void handlePostCommand(RoutingContext routingContext) {
+        commandService.postCommand(routingContext);
+        // publish command and send response
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
new file mode 100644
index 00000000..b20b1021
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
@@ -0,0 +1,78 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.handler;
+
+import io.vertx.codegen.annotations.Nullable;
+import io.vertx.core.Future;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.service.DeviceConfigService;
+import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
+import org.eclipse.hono.communication.core.utils.ResponseUtils;
+
+import javax.enterprise.context.ApplicationScoped;
+
+/**
+ * Handler for device config endpoints
+ */
+@ApplicationScoped
+public class DeviceConfigsHandler implements HttpEndpointHandler {
+
+    private final String QUERY_PARAMS_NUM_VERSION = "numVersions";
+
+    private final DeviceConfigService configService;
+
+    public DeviceConfigsHandler(DeviceConfigService configService) {
+        this.configService = configService;
+    }
+
+
+    @Override
+    public void addRoutes(RouterBuilder routerBuilder) {
+        routerBuilder.operation(DeviceConfigsConstants.LIST_CONFIG_VERSIONS_OP_ID)
+                .handler(this::handleListConfigVersions);
+        routerBuilder.operation(DeviceConfigsConstants.POST_MODIFY_DEVICE_CONFIG_OP_ID)
+                .handler(this::handleModifyCloudToDeviceConfig);
+    }
+
+    public Future<@Nullable DeviceConfigEntity> handleModifyCloudToDeviceConfig(RoutingContext routingContext) {
+        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+
+        final DeviceConfigRequest deviceConfig = routingContext.body()
+                .asJsonObject()
+                .mapTo(DeviceConfigRequest.class);
+
+        return configService.modifyCloudToDeviceConfig(deviceConfig, deviceId, tenantId)
+                .onSuccess(result -> ResponseUtils.successResponse(routingContext, result))
+                .onFailure(err -> ResponseUtils.errorResponse(routingContext, err));
+    }
+
+    public Future<ListDeviceConfigVersionsResponse> handleListConfigVersions(RoutingContext routingContext) {
+        var limit = Integer.parseInt(routingContext.queryParams().get(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS));
+        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+
+        return configService.listAll(deviceId, tenantId, limit)
+                .onSuccess(result -> ResponseUtils.successResponse(routingContext, result))
+                .onFailure(err -> ResponseUtils.errorResponse(routingContext, err));
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
new file mode 100644
index 00000000..cc009ad5
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
@@ -0,0 +1,48 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.mapper;
+
+import org.eclipse.hono.communication.api.entity.DeviceConfig;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.NullValuePropertyMappingStrategy;
+
+import java.time.Instant;
+
+@Mapper(componentModel = "cdi",
+        nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
+public interface DeviceConfigMapper {
+
+    DeviceConfigEntity deviceConfigToEntity(DeviceConfig deviceConfig);
+
+
+    DeviceConfig entityToDeviceConfig(DeviceConfigEntity entity);
+
+    @Mapping(target = "version", source = "request.versionToUpdate")
+    @Mapping(target = "cloudUpdateTime", expression = "java(getDateTime())")
+    DeviceConfig configRequestToDeviceConfig(DeviceConfigRequest request);
+
+    @Mapping(target = "version", source = "request.versionToUpdate")
+    @Mapping(target = "cloudUpdateTime", expression = "java(getDateTime())")
+    DeviceConfigEntity configRequestToDeviceConfigEntity(DeviceConfigRequest request);
+
+    default String getDateTime() {
+        return Instant.now().toString();
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
new file mode 100644
index 00000000..34c0bec0
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
@@ -0,0 +1,34 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.repository;
+
+import io.vertx.core.Future;
+import io.vertx.sqlclient.SqlConnection;
+import org.eclipse.hono.communication.api.entity.DeviceConfig;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+
+import java.util.List;
+
+/**
+ * Device config repository interface
+ */
+public interface DeviceConfigsRepository {
+
+    Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit);
+
+    Future<DeviceConfigEntity> createOrUpdate(SqlConnection sqlConnection, DeviceConfigEntity entity);
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
new file mode 100644
index 00000000..777be10d
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
@@ -0,0 +1,202 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.repository;
+
+import io.vertx.core.Future;
+import io.vertx.core.impl.logging.Logger;
+import io.vertx.core.impl.logging.LoggerFactory;
+import io.vertx.sqlclient.RowIterator;
+import io.vertx.sqlclient.SqlConnection;
+import io.vertx.sqlclient.templates.RowMapper;
+import io.vertx.sqlclient.templates.SqlTemplate;
+import org.eclipse.hono.communication.api.entity.DeviceConfig;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
+
+import javax.enterprise.context.ApplicationScoped;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Repository class for making CRUD operations for device config entities
+ */
+@ApplicationScoped
+public class DeviceConfigsRepositoryImpl implements DeviceConfigsRepository {
+    private final static String SQL_INSERT = "INSERT INTO \"deviceConfig\" (version, \"tenantId\", \"deviceId\", \"cloudUpdateTime\", \"deviceAckTime\", \"binaryData\") " +
+            "VALUES (#{version}, #{tenantId}, #{deviceId}, #{cloudUpdateTime}, #{deviceAckTime}, #{binaryData}) RETURNING version";
+    private final static String SQL_UPDATE = "UPDATE \"deviceConfig\" SET \"cloudUpdateTime\" = #{cloudUpdateTime}, \"deviceAckTime\" = #{deviceAckTime}, " +
+            "\"binaryData\" = #{binaryData} WHERE version = #{version} and \"tenantId\" = #{tenantId} and \"deviceId\" = #{deviceId}";
+    private final static String SQL_LIST = "SELECT version, \"cloudUpdateTime\", COALESCE(\"deviceAckTime\",'') AS  \"deviceAckTime\", \"binaryData\" " +
+            "FROM \"deviceConfig\" WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId} ORDER BY version DESC LIMIT #{limit}";
+    private final static String SQL_FIND_MAX_VERSION = "SELECT COALESCE(max(version), 0) AS version from \"deviceConfig\" " +
+            "WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId}";
+    private final Logger log = LoggerFactory.getLogger(DeviceConfigsRepositoryImpl.class);
+    private final DatabaseConfig databaseConfig;
+    private String SQL_COUNT_DEVICES_WITH_PK_FILTER = "SELECT COUNT(*) as total FROM %s where %s = #{tenantId} and %s = #{deviceId}";
+
+    public DeviceConfigsRepositoryImpl(DatabaseConfig databaseConfig) {
+        this.databaseConfig = databaseConfig;
+
+        SQL_COUNT_DEVICES_WITH_PK_FILTER = String.format(SQL_COUNT_DEVICES_WITH_PK_FILTER,
+                databaseConfig.getDeviceRegistrationTableName(),
+                databaseConfig.getDeviceRegistrationTenantIdColumn(),
+                databaseConfig.getDeviceRegistrationDeviceIdColumn());
+    }
+
+
+    private Future<Integer> countDevices(SqlConnection sqlConnection, String deviceId, String tenantId) {
+        final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("total");
+        return SqlTemplate
+                .forQuery(sqlConnection, SQL_COUNT_DEVICES_WITH_PK_FILTER)
+                .mapTo(ROW_MAPPER)
+                .execute(Map.of("deviceId", deviceId, "tenantId", tenantId)).map(rowSet -> {
+                    final RowIterator<Integer> iterator = rowSet.iterator();
+                    return iterator.next();
+                });
+
+    }
+
+    /**
+     * Lists all config versions for a specific device. Result is order by version desc
+     *
+     * @param sqlConnection The sql connection instance
+     * @param deviceId      The device id
+     * @param tenantId      The tenant id
+     * @param limit         The number of config to show
+     * @return A Future with a List of DeviceConfigs
+     */
+    public Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit) {
+        return SqlTemplate
+                .forQuery(sqlConnection, SQL_LIST)
+                .mapTo(DeviceConfig.class)
+                .execute(Map.of("limit", limit, "deviceId", deviceId, "tenantId", tenantId))
+                .map(rowSet -> {
+                    final List<DeviceConfig> configs = new ArrayList<>();
+                    rowSet.forEach(configs::add);
+                    return configs;
+                })
+                .onSuccess(success -> log.info(
+                        String.format("Listing all configs for device %s and tenant %s",
+                                deviceId, tenantId)))
+                .onFailure(throwable -> log.error("Error: {}", throwable));
+    }
+
+    /**
+     * Updates an entity for a given version
+     *
+     * @param sqlConnection The sql connection instance
+     * @param entity        The instance to insert
+     * @return A Future of the created DeviceConfigEntity
+     */
+    private Future<DeviceConfigEntity> update(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+
+        return SqlTemplate
+                .forQuery(sqlConnection, SQL_UPDATE)
+                .mapFrom(DeviceConfigEntity.class)
+                .execute(entity)
+                .map(rowSet -> {
+                    if (rowSet.rowCount() > 0) {
+                        return entity;
+                    } else {
+                        throw new IllegalStateException(String.format("Device config version doesn't exist: %s", entity));
+                    }
+                })
+                .onSuccess(success -> log.info(String.format("Device config updated successfully: %s", success.toString())))
+                .onFailure(throwable -> log.error("Error: {}", throwable));
+    }
+
+    /**
+     * Increases the version number and creates a new entity.
+     *
+     * @param sqlConnection The sql connection instance
+     * @param entity        The instance to insert
+     * @return A Future of the created DeviceConfigEntity
+     */
+    private Future<DeviceConfigEntity> create(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+        final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("version");
+
+        return SqlTemplate
+                .forQuery(sqlConnection, SQL_FIND_MAX_VERSION)
+                .mapFrom(DeviceConfigEntity.class)
+                .mapTo(ROW_MAPPER)
+                .execute(entity)
+                .map(rowSet -> {
+                    final RowIterator<Integer> iterator = rowSet.iterator();
+                    return iterator.hasNext() ? iterator.next() + 1 : 1;
+                }).compose(maxResults -> {
+                            entity.setVersion(maxResults);
+                            return insertEntity(sqlConnection, entity);
+                        }
+                )
+                .onSuccess(success -> log.info(String.format("Device configs created successfully: %s", success.toString())))
+                .onFailure(throwable -> log.error("Error: {}", throwable));
+    }
+
+    /**
+     * Inserts an entity to Database
+     *
+     * @param sqlConnection The sql connection instance
+     * @param entity        The instance to insert
+     * @return A Future of the created DeviceConfigEntity
+     */
+    private Future<DeviceConfigEntity> insertEntity(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+        return SqlTemplate
+                .forUpdate(sqlConnection, SQL_INSERT)
+                .mapFrom(DeviceConfigEntity.class)
+                .mapTo(DeviceConfigEntity.class)
+                .execute(entity)
+                .map(rowSet -> {
+                    final RowIterator<DeviceConfigEntity> iterator = rowSet.iterator();
+                    if (iterator.hasNext()) {
+                        entity.setVersion(iterator.next().getVersion());
+                        return entity;
+                    } else {
+                        throw new IllegalStateException(String.format("Can't create device config: %s", entity));
+                    }
+                });
+    }
+
+
+    /**
+     * Creates a new config if version is 0 else updates the current config
+     *
+     * @param sqlConnection The sql connection instance
+     * @param entity        The instance to insert
+     * @return A Future of the created DeviceConfigEntity
+     */
+    public Future<DeviceConfigEntity> createOrUpdate(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+        return countDevices(sqlConnection, entity.getDeviceId(), entity.getTenantId())
+                .compose(
+                        counter -> {
+                            if (counter < 1) {
+                                throw new IllegalStateException(String.format("Device with id %s and tenant id %s doesn't exist",
+                                        entity.getDeviceId(),
+                                        entity.getTenantId()));
+                            } else {
+
+                                if (entity.getVersion() == 0) {
+                                    return create(sqlConnection, entity);
+                                } else if (entity.getVersion() > 0) {
+                                    return update(sqlConnection, entity);
+                                } else {
+                                    throw new IllegalStateException("Config version must be >= 0");
+                                }
+                            }
+                        });
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java
new file mode 100644
index 00000000..09f293d4
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java
@@ -0,0 +1,28 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.pgclient.PgPool;
+
+/**
+ * Database service interface
+ */
+public interface DatabaseService {
+    PgPool getDbClient();
+
+    void close();
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
new file mode 100644
index 00000000..a899e8c5
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
@@ -0,0 +1,66 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.core.Vertx;
+import io.vertx.core.impl.logging.Logger;
+import io.vertx.core.impl.logging.LoggerFactory;
+import io.vertx.pgclient.PgPool;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.utils.DbUtils;
+
+import javax.enterprise.context.ApplicationScoped;
+
+
+/**
+ * Service for database
+ */
+@ApplicationScoped
+public class DatabaseServiceImpl implements DatabaseService {
+
+    private final Logger log = LoggerFactory.getLogger(DatabaseServiceImpl.class);
+    private final ApplicationConfig appConfigs;
+    private final Vertx vertx;
+    private final PgPool dbClient;
+
+    public DatabaseServiceImpl(ApplicationConfig appConfigs, Vertx vertx) {
+        this.appConfigs = appConfigs;
+        this.vertx = vertx;
+        this.dbClient = DbUtils.createDbClient(vertx, appConfigs);
+        log.debug("Database connection is open.");
+    }
+
+    /**
+     * Gets the database client instance.
+     *
+     * @return The database client
+     */
+    public PgPool getDbClient() {
+        return dbClient;
+    }
+
+    /**
+     * Close database connection
+     */
+    public void close() {
+        if (this.dbClient != null) {
+            this.dbClient.close();
+            log.debug("Database connection is closed.");
+        }
+    }
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java
new file mode 100644
index 00000000..4716b0a0
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java
@@ -0,0 +1,26 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.ext.web.RoutingContext;
+
+/**
+ * Device commands interface
+ */
+public interface DeviceCommandService {
+    void postCommand(RoutingContext routingContext);
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
new file mode 100644
index 00000000..23f939fe
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
@@ -0,0 +1,41 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.ext.web.RoutingContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.enterprise.context.ApplicationScoped;
+
+/**
+ * Service for device commands
+ */
+@ApplicationScoped
+public class DeviceCommandServiceImpl implements DeviceCommandService {
+    private final Logger log = LoggerFactory.getLogger(DeviceCommandServiceImpl.class);
+
+
+    /**
+     * Handles device post commands
+     *
+     * @param routingContext The routing context
+     */
+    public void postCommand(RoutingContext routingContext) {
+        log.info("postCommand received");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
new file mode 100644
index 00000000..e9072881
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
@@ -0,0 +1,33 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.codegen.annotations.Nullable;
+import io.vertx.core.Future;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+
+/**
+ * Device config interface
+ */
+public interface DeviceConfigService {
+
+    Future<@Nullable DeviceConfigEntity> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId);
+
+    Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit);
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
new file mode 100644
index 00000000..9beeac2e
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
@@ -0,0 +1,84 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+
+import io.vertx.codegen.annotations.Nullable;
+import io.vertx.core.Future;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.mapper.DeviceConfigMapper;
+import org.eclipse.hono.communication.api.repository.DeviceConfigsRepository;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.enterprise.context.ApplicationScoped;
+
+
+/**
+ * Service for device commands
+ */
+
+@ApplicationScoped
+public class DeviceConfigServiceImpl implements DeviceConfigService {
+    private final Logger log = LoggerFactory.getLogger(DeviceConfigServiceImpl.class);
+
+    private final DeviceConfigsRepository repository;
+    private final DatabaseService db;
+    private final DeviceConfigMapper mapper;
+
+    public DeviceConfigServiceImpl(DeviceConfigsRepository repository,
+                                   DatabaseService db,
+                                   DeviceConfigMapper mapper) {
+
+        this.repository = repository;
+        this.db = db;
+        this.mapper = mapper;
+    }
+
+    public Future<@Nullable DeviceConfigEntity> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId) {
+
+        var entity = mapper.configRequestToDeviceConfigEntity(deviceConfig);
+        entity.setDeviceId(deviceId);
+        entity.setTenantId(tenantId);
+
+        return db.getDbClient().withTransaction(
+                        sqlConnection -> {
+                            return repository.createOrUpdate(sqlConnection, entity);
+                        })
+                .onSuccess(success -> log.info(success.toString()))
+                .onFailure(error -> log.error(error.getMessage()));
+    }
+
+    public Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit) {
+        return db.getDbClient().withTransaction(
+                        sqlConnection -> {
+                            return repository.listAll(sqlConnection, deviceId, tenantId, limit)
+                                    .map(
+                                            result -> {
+                                                var listConfig = new ListDeviceConfigVersionsResponse();
+                                                listConfig.setDeviceConfigs(result);
+                                                return listConfig;
+                                            }
+                                    );
+                        }
+                )
+                .onSuccess(success -> log.info(success.getDeviceConfigs().toString()))
+                .onFailure(error -> log.error(error.getMessage()));
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java
new file mode 100644
index 00000000..d062701e
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java
@@ -0,0 +1,44 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import org.eclipse.hono.communication.api.handler.DeviceCommandsHandler;
+import org.eclipse.hono.communication.api.handler.DeviceConfigsHandler;
+import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
+
+import javax.enterprise.context.ApplicationScoped;
+import java.util.List;
+
+/**
+ * Provides and Manages available HTTP vertx handlers
+ */
+@ApplicationScoped
+public class VertxHttpHandlerManagerService {
+    /**
+     * Available vertx endpoints handler services
+     */
+    private final List<HttpEndpointHandler> availableHandlerServices;
+
+
+    public VertxHttpHandlerManagerService(DeviceConfigsHandler configHandler, DeviceCommandsHandler commandHandler) {
+        this.availableHandlerServices = List.of(configHandler, commandHandler);
+    }
+
+    public List<HttpEndpointHandler> getAvailableHandlerServices() {
+        return availableHandlerServices;
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
new file mode 100644
index 00000000..dd894ea0
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
@@ -0,0 +1,160 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.app;
+
+import io.quarkus.runtime.ShutdownEvent;
+import io.quarkus.runtime.StartupEvent;
+import io.vertx.core.Closeable;
+import io.vertx.core.Vertx;
+import io.vertx.core.impl.VertxInternal;
+import io.vertx.core.impl.cpu.CpuCoreSensor;
+import io.vertx.core.json.impl.JsonUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.enterprise.event.Observes;
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+/**
+ * Abstract Service application class
+ */
+public abstract class AbstractServiceApplication {
+
+    private final Logger log = LoggerFactory.getLogger(AbstractServiceApplication.class);
+
+    /**
+     * The vert.x instance managed by Quarkus.
+     */
+    protected Vertx vertx;
+    /**
+     * YAML file application configurations properties
+     */
+    protected ApplicationConfig appConfigs;
+    private Closeable addedVertxCloseHook;
+
+
+    public AbstractServiceApplication(final Vertx vertx,
+                                      ApplicationConfig appConfigs) {
+        this.vertx = vertx;
+        this.appConfigs = appConfigs;
+    }
+
+    /**
+     * Logs information about the JVM.
+     */
+    protected void logJvmDetails() {
+        if (log.isInfoEnabled()) {
+
+            final String base64Encoder = Base64.getEncoder() == JsonUtil.BASE64_ENCODER ? "legacy" : "URL safe";
+
+            log.info("""
+                            running on Java VM [version: {}, name: {}, vendor: {}, max memory: {}MiB, processors: {}] \
+                            with vert.x using {} Base64 encoder\
+                            """,
+                    System.getProperty("java.version"),
+                    System.getProperty("java.vm.name"),
+                    System.getProperty("java.vm.vendor"),
+                    Runtime.getRuntime().maxMemory() >> 20,
+                    CpuCoreSensor.availableProcessors(),
+                    base64Encoder);
+        }
+    }
+
+    /**
+     * Registers a close hook that will be notified when the Vertx instance is being closed
+     */
+    private void registerVertxCloseHook() {
+        if (vertx instanceof VertxInternal vertxInternal) {
+            final Closeable closeHook = completion -> {
+                final var stackTrace = Thread.currentThread().getStackTrace();
+                final String s = Arrays.stream(stackTrace)
+                        .skip(2)
+                        .map(element -> "\tat %s.%s(%s:%d)".formatted(
+                                element.getClassName(),
+                                element.getMethodName(),
+                                element.getFileName(),
+                                element.getLineNumber()))
+                        .collect(Collectors.joining(System.lineSeparator()));
+                log.warn("managed vert.x instance has been closed unexpectedly{}{}", System.lineSeparator(), s);
+                completion.complete();
+            };
+            vertxInternal.addCloseHook(closeHook);
+            addedVertxCloseHook = closeHook;
+        } else {
+            log.debug("Vertx instance is not a VertxInternal, skipping close hook registration");
+        }
+    }
+
+    /**
+     * Starts this component.
+     * <p>
+     * This implementation
+     * <ol>
+     * <li>logs the VM details,</li>
+     * <li>invokes {@link #doStart()}.</li>
+     * </ol>
+     *
+     * @param ev The event indicating shutdown.
+     */
+    public void onStart(final @Observes StartupEvent ev) {
+
+        logJvmDetails();
+        registerVertxCloseHook();
+        log.info("Starting component {}...", appConfigs.componentName);
+        doStart();
+    }
+
+    /**
+     * Invoked during start up.
+     * <p>
+     * Subclasses should override this method in order to initialize
+     * the component.
+     */
+    protected void doStart() {
+        // do nothing
+    }
+
+    protected void doStop() {
+        // do nothing
+    }
+
+
+    /**
+     * Stops this component.
+     *
+     * @param ev The event indicating shutdown.
+     */
+    public void onStop(final @Observes ShutdownEvent ev) {
+        doStop();
+        log.info("shutting down {}", appConfigs.componentName);
+        if (addedVertxCloseHook != null && vertx instanceof VertxInternal vertxInternal) {
+            vertxInternal.removeCloseHook(addedVertxCloseHook);
+        }
+        final CompletableFuture<Void> shutdown = new CompletableFuture<>();
+        vertx.close(attempt -> {
+            if (attempt.succeeded()) {
+                shutdown.complete(null);
+            } else {
+                shutdown.completeExceptionally(attempt.cause());
+            }
+        });
+        shutdown.join();
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java
new file mode 100644
index 00000000..5fc2fde0
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java
@@ -0,0 +1,62 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.app;
+
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+
+import javax.inject.Singleton;
+
+
+/**
+ * Application configurations
+ */
+@Singleton
+public class ApplicationConfig {
+
+    private final ServerConfig serverConfig;
+    private final DatabaseConfig databaseConfig;
+
+    // Application
+    @ConfigProperty(name = "app.name")
+    String componentName;
+
+
+    @ConfigProperty(name = "app.version")
+    String version;
+
+    public ApplicationConfig(ServerConfig serverConfig, DatabaseConfig databaseConfig) {
+        this.serverConfig = serverConfig;
+        this.databaseConfig = databaseConfig;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public String getComponentName() {
+        return componentName;
+    }
+
+
+    public ServerConfig getServerConfig() {
+        return serverConfig;
+    }
+
+    public DatabaseConfig getDatabaseConfig() {
+        return databaseConfig;
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
new file mode 100644
index 00000000..97e7756a
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
@@ -0,0 +1,84 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.app;
+
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+
+import javax.inject.Singleton;
+
+/**
+ * Database configurations
+ */
+@Singleton
+public class DatabaseConfig {
+
+    // Datasource properties
+    @ConfigProperty(name = "quarkus.datasource.port")
+    int port;
+    @ConfigProperty(name = "quarkus.datasource.host")
+    String host;
+    @ConfigProperty(name = "quarkus.datasource.username")
+    String userName;
+    @ConfigProperty(name = "quarkus.datasource.password")
+    String password;
+    @ConfigProperty(name = "quarkus.datasource.name")
+    String name;
+    @ConfigProperty(name = "quarkus.datasource.pool-max-size")
+    int poolMaxSize;
+    @ConfigProperty(name = "quarkus.device-registration.table")
+    String deviceRegistrationTableName;
+    @ConfigProperty(name = "quarkus.device-registration.tenant-id-column")
+    String deviceRegistrationTenantIdColumn;
+    @ConfigProperty(name = "quarkus.device-registration.device-id-column")
+    String deviceRegistrationDeviceIdColumn;
+
+    public String getDeviceRegistrationTableName() {
+        return deviceRegistrationTableName;
+    }
+
+    public String getDeviceRegistrationTenantIdColumn() {
+        return deviceRegistrationTenantIdColumn;
+    }
+
+    public String getDeviceRegistrationDeviceIdColumn() {
+        return deviceRegistrationDeviceIdColumn;
+    }
+
+    public int getPoolMaxSize() {
+        return poolMaxSize;
+    }
+
+    public int getPort() {
+        return port;
+    }
+
+    public String getHost() {
+        return host;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String getName() {
+        return name;
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
new file mode 100644
index 00000000..54903a13
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
@@ -0,0 +1,48 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.app;
+
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+
+import javax.inject.Singleton;
+
+/**
+ * Server configurations
+ */
+@Singleton
+public class ServerConfig {
+
+    // Vertx server properties
+    @ConfigProperty(name = "vertx.openapi.file")
+    String openApiFilePath;
+    @ConfigProperty(name = "vertx.server.url")
+    String serverUrl;
+    @ConfigProperty(name = "vertx.server.port", defaultValue = "8080")
+    int serverPort;
+
+    public String getOpenApiFilePath() {
+        return openApiFilePath;
+    }
+
+    public String getServerUrl() {
+        return serverUrl;
+    }
+
+    public int getServerPort() {
+        return serverPort;
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java
new file mode 100644
index 00000000..a0441fef
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java
@@ -0,0 +1,35 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.http;
+
+import io.vertx.core.Vertx;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+
+/**
+ * Abstract class for creating HTTP server in quarkus
+ * using the managed vertx api
+ */
+public abstract class AbstractVertxHttpServer {
+    protected final ApplicationConfig appConfigs;
+    protected final Vertx vertx;
+
+
+    public AbstractVertxHttpServer(ApplicationConfig appConfigs, Vertx vertx) {
+        this.appConfigs = appConfigs;
+        this.vertx = vertx;
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpEndpointHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpEndpointHandler.java
new file mode 100644
index 00000000..8eba4df6
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpEndpointHandler.java
@@ -0,0 +1,32 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.http;
+
+import io.vertx.ext.web.openapi.RouterBuilder;
+
+/**
+ * An vertx endpoint that handles HTTP requests.
+ */
+public interface HttpEndpointHandler {
+    /**
+     * Adds custom routes for handling requests that this endpoint can handle.
+     *
+     * @param router The router to add the routes to.
+     */
+    void addRoutes(RouterBuilder router);
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java
new file mode 100644
index 00000000..cbfce4c4
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java
@@ -0,0 +1,34 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.http;
+
+/**
+ * HTTP server service
+ */
+public interface HttpServer {
+
+    /**
+     * Starts the http server
+     */
+    void start();
+
+    /**
+     * Stops the http server
+     */
+    void stop();
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
new file mode 100644
index 00000000..8202b152
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
@@ -0,0 +1,34 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.http;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Base HTTP service class
+ */
+public class HttpServiceBase {
+
+    protected final Logger log = LoggerFactory.getLogger(getClass());
+    private final Map<String, HttpEndpointHandler> endpoints = new HashMap<>();
+
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
new file mode 100644
index 00000000..c3eb514f
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
@@ -0,0 +1,50 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.utils;
+
+import io.vertx.core.Vertx;
+import io.vertx.pgclient.PgConnectOptions;
+import io.vertx.pgclient.PgPool;
+import io.vertx.sqlclient.PoolOptions;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+
+/**
+ * Database utilities class
+ */
+public class DbUtils {
+
+    /**
+     * Build DB client that is used to manage a pool of connections
+     *
+     * @param vertx Vertx context
+     * @return PostgreSQL pool
+     */
+    public static PgPool createDbClient(Vertx vertx, ApplicationConfig appConfigs) {
+        var dbConfigs = appConfigs.getDatabaseConfig();
+        final PgConnectOptions connectOptions = new PgConnectOptions()
+                .setHost(dbConfigs.getHost())
+                .setPort(dbConfigs.getPort())
+                .setDatabase(dbConfigs.getName())
+                .setUser(dbConfigs.getUserName())
+                .setPassword(dbConfigs.getPassword());
+
+        final PoolOptions poolOptions = new PoolOptions().setMaxSize(dbConfigs.getPoolMaxSize());
+
+        return PgPool.pool(vertx, connectOptions, poolOptions);
+    }
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
new file mode 100644
index 00000000..2af8a2a8
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
@@ -0,0 +1,104 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.core.utils;
+
+import io.vertx.core.json.Json;
+import io.vertx.core.json.JsonObject;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.validation.BadRequestException;
+
+import java.util.NoSuchElementException;
+
+/**
+ * HTTP Response utilities class
+ */
+public abstract class ResponseUtils {
+    private static final String CONTENT_TYPE_HEADER = "Content-Type";
+    private static final String APPLICATION_JSON_TYPE = "application/json";
+
+
+    public static void successResponse(RoutingContext rc,
+                                       Object response) {
+        rc.response()
+                .setStatusCode(200)
+                .putHeader(CONTENT_TYPE_HEADER, APPLICATION_JSON_TYPE)
+                .end(Json.encodePrettily(response));
+    }
+
+    /**
+     * Build success response using 201 Created as its status code and response as its body
+     *
+     * @param rc       Routing context
+     * @param response Response body
+     */
+    public static void createdResponse(RoutingContext rc,
+                                       Object response) {
+        rc.response()
+                .setStatusCode(201)
+                .putHeader(CONTENT_TYPE_HEADER, APPLICATION_JSON_TYPE)
+                .end(Json.encodePrettily(response));
+    }
+
+    /**
+     * Build success response using 204 No Content as its status code and no body
+     *
+     * @param rc Routing context
+     */
+    public static void noContentResponse(RoutingContext rc) {
+        rc.response()
+                .setStatusCode(204)
+                .end();
+    }
+
+    /**
+     * Build error response using 400 Bad Request, 404 Not Found or 500 Internal Server Error
+     * as its status code and throwable as its body
+     *
+     * @param rc    Routing context
+     * @param error Throwable exception
+     */
+    public static void errorResponse(RoutingContext rc, Throwable error) {
+        final int status;
+        final String message;
+
+
+        if (error instanceof IllegalArgumentException
+                || error instanceof IllegalStateException
+                || error instanceof NullPointerException
+                || error instanceof BadRequestException) {
+            
+            // Bad Request
+            status = 400;
+            message = error.getMessage();
+        } else if (error instanceof NoSuchElementException) {
+            // Not Found
+            status = 404;
+            message = error.getMessage();
+        } else {
+            // Internal Server Error
+            status = 500;
+            message = "Internal Server Error";
+        }
+
+        rc.response()
+                .setStatusCode(status)
+                .putHeader(CONTENT_TYPE_HEADER, APPLICATION_JSON_TYPE)
+                .end(new JsonObject().put("error", message).encodePrettily());
+    }
+
+
+}
diff --git a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
new file mode 100644
index 00000000..5b94daa4
--- /dev/null
+++ b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
@@ -0,0 +1,206 @@
+---
+openapi: 3.0.2
+info:
+  title: Hono Device Communication
+  version: 1.0.0
+  description: Device commands and configs API.
+paths:
+  /commands/{tenantid}/{deviceid}:
+    summary: Device commands
+    description: Commands for a specific device
+    post:
+      requestBody:
+        description: CommandRequest object as JSON
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/DeviceCommandRequest'
+        required: true
+      tags:
+        - COMMANDS
+      responses:
+        "200":
+          description: Command was sent successfully
+        "400":
+          description: Command can not be send to device
+      operationId: postCommand
+      summary: Send a command to device.
+    parameters:
+      - name: tenantid
+        description: Unique registry ID
+        schema:
+          type: string
+        in: path
+        required: true
+      - name: deviceid
+        description: Unique device ID
+        schema:
+          type: string
+        in: path
+        required: true
+  /configs/{tenantid}/{deviceid}:
+    summary: Device configs
+    description: Configs for a specific device
+    get:
+      tags:
+        - CONFIGS
+      parameters:
+        - name: numVersions
+          description: "The number of versions to list. Versions are listed in decreasing
+          order of the version number. The maximum number of versions retained is
+          10. If this value is zero, it will return all the versions available."
+          schema:
+            type: integer
+          in: query
+          required: true
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ListDeviceConfigVersionsResponse'
+          description: Lists the device config versions
+      operationId: listConfigVersions
+      summary: List a device config versions
+      description: "Lists the last few versions of the device configuration in descending
+        order (i.e.: newest first)."
+    post:
+      requestBody:
+        description: DeviceConfigRequest object as JSON
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/DeviceConfigRequest'
+            examples:
+              Device-configs-example:
+                value:
+                  versionToUpdate: some text
+                  binaryData: some text
+        required: true
+      tags:
+        - CONFIGS
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/DeviceConfig'
+          description: Device config updated successfully
+        "400":
+          description: Validation error
+        "500":
+          description: Internal error
+      operationId: modifyCloudToDeviceConfig
+      summary: Modify cloud to device config
+      description: Modifies the configuration for a specific device and Returns the
+        modified configuration version and its metadata.
+    parameters:
+      - name: tenantid
+        description: Unique registry id
+        schema:
+          type: string
+        in: path
+        required: true
+      - name: deviceid
+        description: Unique device id
+        schema:
+          type: string
+        in: path
+        required: true
+components:
+  schemas:
+    DeviceCommandRequest:
+      title: Root Type for Command
+      description: Command json object structure
+      required:
+        - binaryData
+      type: object
+      properties:
+        binaryData:
+          description: "The command data to send to the device in base64-encoded string\
+            \ format.\r\n\r\n"
+          type: string
+        subfolder:
+          description: "Optional subfolder for the command. If empty, the command
+            will be delivered to the /devices/{device-id}/commands topic, otherwise
+            it will be delivered to the /devices/{device-id}/commands/{subfolder}
+            topic. Multi-level subfolders are allowed. This field must not have
+            more than 256 characters, and must not contain any MQTT wildcards 
+            (\"+\" or \"#\") or null characters."
+          type: string
+      example:
+        binaryData: A base64-encoded string
+        subfolder: Optional subfolder for the command
+    DeviceConfigRequest:
+      description: Request body for modifying device configs
+      required:
+        - versionToUpdate
+        - binaryData
+      type: object
+      properties:
+        versionToUpdate:
+          description: "string (int64 format)\r\n\r\nThe version number to update.
+            If this value is zero, it will not check the version number of the server
+            and will always update the current version; otherwise, this update will
+            fail if the version number found on the server does not match this version
+            number. This is used to support multiple simultaneous updates without
+            losing data."
+          type: string
+        binaryData:
+          description: "string (bytes format)\r\n\r\nThe configuration data for the
+            device in string base64-encoded format.\r\n"
+          type: string
+    ListDeviceConfigVersionsResponse:
+      title: Root Type for ListDeviceConfigVersionsResponse
+      description: A list of a device config versions
+      type: object
+      properties:
+        deviceConfigs:
+          description: List of DeviceConfig objects
+          type: array
+          items:
+            $ref: '#/components/schemas/DeviceConfig'
+      example:
+        deviceConfigs:
+          - object: DeviceConfigResponse
+    DeviceConfig:
+      title: Root Type for DeviceConfigResponse
+      description: The device configuration.
+      type: object
+      properties:
+        version:
+          description: "String (int64 format) [Output only] The version
+            of this update. The version number is assigned by the server, and is
+            always greater than 0 after device creation. The version must be 0 on
+            the devices.create request if a config is specified; the response of
+            devices.create will always have a value of 1."
+          type: string
+        cloudUpdateTime:
+          description: "String (Timestamp format) [Output only] The time at
+            which this configuration version was updated in Cloud IoT Core. This
+            timestamp is set by the server. Timestamp in 
+            RFC3339 UTC \"Zulu\" format, accurate to nanoseconds. 
+            Example: \"2014-10-02T15:01:23.045123456Z\"."
+          type: string
+        deviceAckTime:
+          description: "string (Timestamp format) [Output only] The time at
+            which Cloud IoT Core received the acknowledgment from the device, indicating
+            that the device has received this configuration version. If this field
+            is not present, the device has not yet acknowledged that it received
+            this version. Note that when the config was sent to the device, many
+            config versions may have been available in Cloud IoT Core while the
+            device was disconnected, and on connection, only the latest version
+            is sent to the device. Some versions may never be sent to the device,
+            and therefore are never acknowledged. This timestamp is set by Cloud
+            IoT Core. Timestamp in RFC3339 UTC \"Zulu\" format, accurate
+            to nanoseconds. Example: \"2014-10-02T15:01:23.045123456Z\"."
+          type: string
+        binaryData:
+          description: "string (bytes format) The device configuration data
+            in string base64-encoded format."
+          type: string
+      example:
+        version: string
+        cloudUpdateTime: string
+        deviceAckTime: string
+        binaryData: string
diff --git a/device-communication/src/main/resources/application.yaml b/device-communication/src/main/resources/application.yaml
new file mode 100644
index 00000000..f1618822
--- /dev/null
+++ b/device-communication/src/main/resources/application.yaml
@@ -0,0 +1,37 @@
+app:
+  name: "Device Communication"
+  version: "v1"
+vertx:
+  openapi:
+    file: "/api/hono-device-communication-v1.yaml"
+  server:
+    url: "localhost"
+    port: 8081
+
+quarkus:
+  flyway:
+    migrate-at-start: true
+  # Device registration table configs. Used for validating devices
+  device-registration:
+    table: "device_registration"
+    tenant-id-column: "tenant_id"
+    device-id-column: "device_id"
+  datasource:
+    pool-max-size: 5
+    name: "hono"
+    host: "localhost"
+    port: 5432
+    username: "postgres"
+    password: "mysecretpassword"
+    db-kind: "postgresql"
+    jdbc:
+      url: "jdbc:postgresql://localhost:5432/hono"
+
+
+"%dev":
+  app:
+    name: "Device Communication"
+  vertx:
+    server:
+      url: "localhost"
+      port: "8081"
\ No newline at end of file
diff --git a/device-communication/src/main/resources/db/migration/V1.0__create.sql b/device-communication/src/main/resources/db/migration/V1.0__create.sql
new file mode 100644
index 00000000..69fb9487
--- /dev/null
+++ b/device-communication/src/main/resources/db/migration/V1.0__create.sql
@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS public."deviceConfig"
+(
+    version           INT          not null,
+    "tenantId"        VARCHAR(100) not null,
+    "deviceId"        VARCHAR(100) not null,
+    "cloudUpdateTime" VARCHAR(100) not null,
+    "deviceAckTime"   VARCHAR(100),
+    "binaryData"      VARCHAR      not null,
+
+    PRIMARY KEY (version, "tenantId", "deviceId")
+)
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java
new file mode 100644
index 00000000..53425a75
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java
@@ -0,0 +1,56 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api;
+
+import io.vertx.core.Vertx;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.http.HttpServer;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.mockito.Mockito.*;
+
+class ApplicationTest {
+
+    private HttpServer httpServerMock;
+    private Application application;
+
+    @BeforeEach
+    void setUp() {
+        httpServerMock = mock(HttpServer.class);
+        Vertx vertxMock = mock(Vertx.class);
+        ApplicationConfig appConfigs = mock(ApplicationConfig.class);
+        application = new Application(vertxMock, appConfigs, httpServerMock);
+
+        verifyNoMoreInteractions(httpServerMock, appConfigs, vertxMock);
+    }
+
+    @AfterEach
+    void tearDown() {
+    }
+
+    @Test
+    void doStart() {
+        doNothing().when(httpServerMock).start();
+
+        application.doStart();
+
+        verify(httpServerMock, times(1)).start();
+
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
new file mode 100644
index 00000000..d30d376b
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
@@ -0,0 +1,317 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api;
+
+
+import io.netty.handler.codec.http.HttpHeaderNames;
+import io.quarkus.runtime.Quarkus;
+import io.vertx.core.Future;
+import io.vertx.core.Vertx;
+import io.vertx.core.http.*;
+import io.vertx.core.json.JsonObject;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import io.vertx.ext.web.validation.BadRequestException;
+import org.eclipse.hono.communication.api.handler.DeviceCommandsHandler;
+import org.eclipse.hono.communication.api.service.DatabaseService;
+import org.eclipse.hono.communication.api.service.DatabaseServiceImpl;
+import org.eclipse.hono.communication.api.service.VertxHttpHandlerManagerService;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.app.ServerConfig;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
+
+import java.util.List;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+class DeviceCommunicationHttpServerTest {
+
+
+    private ApplicationConfig appConfigsMock;
+    private VertxHttpHandlerManagerService handlerServiceMock;
+    private Vertx vertxMock;
+    private Router routerMock;
+    private RouterBuilder routerBuilderMock;
+    private HttpServer httpServerMock;
+    private DeviceCommunicationHttpServer deviceCommunicationHttpServer;
+    private RoutingContext routingContextMock;
+    private HttpServerResponse httpServerResponseMock;
+    private HttpServerRequest httpServerRequestMock;
+    private BadRequestException badRequestExceptionMock;
+    private JsonObject jsonObjMock;
+
+    private DatabaseService dbMock;
+    private ServerConfig serverConfigMock;
+
+    @BeforeEach
+    void setUp() {
+        handlerServiceMock = mock(VertxHttpHandlerManagerService.class);
+        vertxMock = mock(Vertx.class);
+        routerMock = mock(Router.class);
+        routerBuilderMock = mock(RouterBuilder.class);
+        appConfigsMock = mock(ApplicationConfig.class);
+        serverConfigMock = mock(ServerConfig.class);
+        httpServerMock = mock(HttpServer.class);
+        routingContextMock = mock(RoutingContext.class);
+        httpServerResponseMock = mock(HttpServerResponse.class);
+        httpServerRequestMock = mock(HttpServerRequest.class);
+        badRequestExceptionMock = mock(BadRequestException.class);
+        jsonObjMock = mock(JsonObject.class);
+        dbMock = mock(DatabaseServiceImpl.class);
+        deviceCommunicationHttpServer = new DeviceCommunicationHttpServer(appConfigsMock, vertxMock, handlerServiceMock, dbMock);
+
+    }
+
+
+    @AfterEach
+    void tearDown() {
+        Mockito.verifyNoMoreInteractions(handlerServiceMock,
+                vertxMock,
+                routerMock,
+                routerBuilderMock,
+                appConfigsMock,
+                httpServerMock,
+                routingContextMock,
+                httpServerResponseMock,
+                httpServerRequestMock,
+                badRequestExceptionMock,
+                jsonObjMock,
+                dbMock,
+                serverConfigMock);
+    }
+
+
+    @Test
+    void startSucceeded() {
+        var mockedCommandService = mock(DeviceCommandsHandler.class);
+        Mockito.verifyNoMoreInteractions(mockedCommandService);
+        doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
+        try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
+            mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
+                    .thenReturn(Future.succeededFuture(routerBuilderMock));
+            mockedRouterBuilderStatic.verifyNoMoreInteractions();
+            when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
+            when(handlerServiceMock.getAvailableHandlerServices()).thenReturn(List.of(mockedCommandService));
+            when(routerBuilderMock.createRouter()).thenReturn(routerMock);
+            when(routerMock.errorHandler(anyInt(), any())).thenReturn(routerMock);
+            when(vertxMock.createHttpServer(any(HttpServerOptions.class))).thenReturn(httpServerMock);
+            when(httpServerMock.requestHandler(routerMock)).thenReturn(httpServerMock);
+            when(httpServerMock.listen()).thenReturn(Future.succeededFuture(httpServerMock));
+            when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
+
+            try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
+
+                this.deviceCommunicationHttpServer.start();
+
+                mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
+
+                verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
+                verify(routerBuilderMock, times(1)).createRouter();
+
+                verify(vertxMock, times(1)).createHttpServer(any(HttpServerOptions.class));
+                verify(httpServerMock, times(1)).requestHandler(routerMock);
+                verify(httpServerMock, times(1)).listen();
+                verify(appConfigsMock, times(2)).getServerConfig();
+                verify(serverConfigMock, times(2)).getServerUrl();
+                verify(serverConfigMock, times(2)).getServerPort();
+                verify(mockedCommandService, times(1)).addRoutes(routerBuilderMock);
+                verify(serverConfigMock, times(1)).getOpenApiFilePath();
+                quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
+                quarkusMockedStatic.verifyNoMoreInteractions();
+
+            }
+
+        }
+
+
+    }
+
+    @Test
+    void createRouterFailed() {
+        var mockedCommandService = mock(DeviceCommandsHandler.class);
+        Mockito.verifyNoMoreInteractions(mockedCommandService);
+        doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
+        try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
+            mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
+                    .thenReturn(Future.failedFuture(new RuntimeException()));
+            when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
+            mockedRouterBuilderStatic.verifyNoMoreInteractions();
+            when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
+
+            try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
+                this.deviceCommunicationHttpServer.start();
+
+                verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
+                verify(appConfigsMock, times(1)).getServerConfig();
+                verify(serverConfigMock, times(1)).getOpenApiFilePath();
+                quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
+                quarkusMockedStatic.verifyNoMoreInteractions();
+            }
+
+        }
+    }
+
+
+    @Test
+    void createServerFailed() {
+        var mockedCommandService = mock(DeviceCommandsHandler.class);
+        Mockito.verifyNoMoreInteractions(mockedCommandService);
+        doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
+        try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
+            mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
+                    .thenReturn(Future.succeededFuture(routerBuilderMock));
+            mockedRouterBuilderStatic.verifyNoMoreInteractions();
+            when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
+            when(handlerServiceMock.getAvailableHandlerServices()).thenReturn(List.of());
+            when(routerBuilderMock.createRouter()).thenReturn(routerMock);
+            when(routerMock.errorHandler(anyInt(), any())).thenReturn(routerMock);
+            when(vertxMock.createHttpServer(any(HttpServerOptions.class))).thenReturn(httpServerMock);
+            when(httpServerMock.requestHandler(routerMock)).thenReturn(httpServerMock);
+            when(httpServerMock.listen()).thenReturn(Future.failedFuture(new Throwable()));
+            when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
+
+            try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
+
+                this.deviceCommunicationHttpServer.start();
+
+                mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
+
+                verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
+                verify(routerBuilderMock, times(1)).createRouter();
+                verify(vertxMock, times(1)).createHttpServer(any(HttpServerOptions.class));
+                verify(httpServerMock, times(1)).requestHandler(routerMock);
+                verify(httpServerMock, times(1)).listen();
+                verify(appConfigsMock, times(2)).getServerConfig();
+                verify(serverConfigMock, times(1)).getOpenApiFilePath();
+                verify(serverConfigMock, times(1)).getServerPort();
+                verify(serverConfigMock, times(1)).getServerUrl();
+                quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
+                quarkusMockedStatic.verifyNoMoreInteractions();
+            }
+
+        }
+    }
+
+
+    @Test
+    void addDefault400ExceptionHandler() {
+        var errorMsg = "This is an error message";
+        int code = 400;
+
+        when(routingContextMock.failure()).thenReturn(badRequestExceptionMock);
+        when(badRequestExceptionMock.toJson()).thenReturn(jsonObjMock);
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.setStatusCode(code)).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.end()).thenReturn(Future.succeededFuture());
+        when(jsonObjMock.toString()).thenReturn(errorMsg);
+
+        deviceCommunicationHttpServer.addDefault400ExceptionHandler(routingContextMock);
+
+        verify(routingContextMock, times(1)).response();
+        verify(routingContextMock, times(1)).failure();
+        verify(badRequestExceptionMock, times(1)).toJson();
+        verify(httpServerResponseMock, times(1)).setStatusCode(code);
+        verify(httpServerResponseMock, times(1)).end(errorMsg);
+
+    }
+
+    @Test
+    void addDefault404ExceptionHandlerPutsHeader() {
+
+        var errorMsg = "This is an error message";
+        int code = 404;
+
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.putHeader(eq(HttpHeaderNames.CONTENT_TYPE),
+                anyString())).thenReturn(httpServerResponseMock);
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(routingContextMock.request()).thenReturn(httpServerRequestMock);
+        when(httpServerResponseMock.ended()).thenReturn(Boolean.FALSE);
+        when(routingContextMock.failure()).thenReturn(badRequestExceptionMock);
+        when(badRequestExceptionMock.toJson()).thenReturn(jsonObjMock);
+        when(httpServerRequestMock.method()).thenReturn(HttpMethod.GET);
+        when(httpServerResponseMock.setStatusCode(code)).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.end()).thenReturn(Future.succeededFuture());
+        when(jsonObjMock.toString()).thenReturn(errorMsg);
+
+        deviceCommunicationHttpServer.addDefault404ExceptionHandler(routingContextMock);
+
+        verify(routingContextMock, times(3)).response();
+        verify(routingContextMock, times(1)).request();
+        verify(httpServerResponseMock, times(1)).setStatusCode(code);
+        verify(httpServerResponseMock, times(1)).putHeader(eq(HttpHeaderNames.CONTENT_TYPE),
+                anyString());
+        verify(httpServerResponseMock, times(1)).end(anyString());
+        verify(httpServerResponseMock, times(1)).ended();
+        verify(httpServerRequestMock, times(1)).method();
+
+    }
+
+    @Test
+    void addDefault404ExceptionHandlerResponseEnded() {
+
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.ended()).thenReturn(Boolean.TRUE);
+
+        deviceCommunicationHttpServer.addDefault404ExceptionHandler(routingContextMock);
+
+        verify(routingContextMock, times(1)).response();
+        verify(httpServerResponseMock, times(1)).ended();
+
+    }
+
+    @Test
+    void addDefault404ExceptionHandlerMethodEqualsHead() {
+
+        var errorMsg = "This is an error message";
+        int code = 404;
+
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.ended()).thenReturn(Boolean.FALSE);
+        when(routingContextMock.failure()).thenReturn(badRequestExceptionMock);
+        when(badRequestExceptionMock.toJson()).thenReturn(jsonObjMock);
+
+        when(routingContextMock.request()).thenReturn(httpServerRequestMock);
+        when(httpServerRequestMock.method()).thenReturn(HttpMethod.HEAD);
+        when(httpServerResponseMock.setStatusCode(code)).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.end()).thenReturn(Future.succeededFuture());
+        when(jsonObjMock.toString()).thenReturn(errorMsg);
+
+        deviceCommunicationHttpServer.addDefault404ExceptionHandler(routingContextMock);
+
+        verify(routingContextMock, times(3)).response();
+        verify(routingContextMock, times(1)).request();
+        verify(httpServerResponseMock, times(1)).setStatusCode(code);
+
+        verify(httpServerResponseMock, times(1)).end();
+        verify(httpServerResponseMock, times(1)).ended();
+        verify(httpServerRequestMock, times(1)).method();
+    }
+
+    @Test
+    void stop() {
+        doNothing().when(dbMock).close();
+        deviceCommunicationHttpServer.stop();
+        verify(dbMock).close();
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java
new file mode 100644
index 00000000..ee96c36a
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java
@@ -0,0 +1,89 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.handler;
+
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.Operation;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import org.eclipse.hono.communication.api.config.DeviceCommandConstants;
+import org.eclipse.hono.communication.api.service.DeviceCommandService;
+import org.eclipse.hono.communication.api.service.DeviceCommandServiceImpl;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+class DeviceCommandsHandlerTest {
+
+    private final DeviceCommandService commandServiceMock;
+    private final RouterBuilder routerBuilderMock;
+    private final RoutingContext routingContextMock;
+    private final Operation operationMock;
+    private final DeviceCommandsHandler deviceCommandsHandler;
+
+    public DeviceCommandsHandlerTest() {
+        operationMock = mock(Operation.class);
+        commandServiceMock = mock(DeviceCommandServiceImpl.class);
+        routerBuilderMock = mock(RouterBuilder.class);
+        routingContextMock = mock(RoutingContext.class);
+        deviceCommandsHandler = new DeviceCommandsHandler(commandServiceMock);
+    }
+
+    @AfterEach
+    void tearDown() {
+        verifyNoMoreInteractions(
+                commandServiceMock,
+                routerBuilderMock,
+                routingContextMock,
+                operationMock);
+    }
+
+    @BeforeEach
+    void setUp() {
+        verifyNoMoreInteractions(
+                commandServiceMock,
+                routerBuilderMock,
+                routingContextMock,
+                operationMock);
+
+    }
+
+    @Test
+    void addRoutes() {
+        when(routerBuilderMock.operation(anyString())).thenReturn(operationMock);
+        when(operationMock.handler(any())).thenReturn(operationMock);
+
+        deviceCommandsHandler.addRoutes(routerBuilderMock);
+
+        verify(routerBuilderMock, times(1)).operation(DeviceCommandConstants.POST_DEVICE_COMMAND_OP_ID);
+        verify(operationMock, times(1)).handler(any());
+
+    }
+
+    @Test
+    void handlePostCommand() {
+        doNothing().when(commandServiceMock).postCommand(routingContextMock);
+
+        deviceCommandsHandler.handlePostCommand(routingContextMock);
+
+        verify(commandServiceMock, times(1)).postCommand(routingContextMock);
+    }
+
+
+}
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
new file mode 100644
index 00000000..94d2640f
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
@@ -0,0 +1,238 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.handler;
+
+import io.vertx.core.Future;
+import io.vertx.core.MultiMap;
+import io.vertx.core.http.HttpServerResponse;
+import io.vertx.core.json.Json;
+import io.vertx.core.json.JsonObject;
+import io.vertx.ext.web.RequestBody;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.Operation;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
+import org.eclipse.hono.communication.api.entity.DeviceConfig;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.service.DeviceConfigService;
+import org.eclipse.hono.communication.api.service.DeviceConfigServiceImpl;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+class DeviceConfigsHandlerTest {
+
+    private final DeviceConfigService configServiceMock;
+    private final RouterBuilder routerBuilderMock;
+    private final RoutingContext routingContextMock;
+    private final Operation operationMock;
+    private final RequestBody requestBodyMock;
+    private final DeviceConfigsHandler deviceConfigsHandler;
+    private final JsonObject jsonObjMock;
+    private final HttpServerResponse httpServerResponseMock;
+    private final IllegalArgumentException illegalArgumentExceptionMock;
+
+    private final String tenantID = "tenant_ID";
+    private final String deviceID = "device_ID";
+    private final String errorMsg = "test_error";
+    DeviceConfigRequest deviceConfigRequest = new DeviceConfigRequest("1", "binary_data");
+    DeviceConfigEntity deviceConfigEntity = new DeviceConfigEntity();
+    DeviceConfig deviceConfig = new DeviceConfig();
+
+    public DeviceConfigsHandlerTest() {
+        operationMock = mock(Operation.class);
+        configServiceMock = mock(DeviceConfigServiceImpl.class);
+        routerBuilderMock = mock(RouterBuilder.class);
+        routingContextMock = mock(RoutingContext.class);
+        requestBodyMock = mock(RequestBody.class);
+        jsonObjMock = mock(JsonObject.class);
+        httpServerResponseMock = mock(HttpServerResponse.class);
+        illegalArgumentExceptionMock = mock(IllegalArgumentException.class);
+        deviceConfigsHandler = new DeviceConfigsHandler(configServiceMock);
+
+        deviceConfigEntity.setVersion(1);
+        deviceConfigEntity.setTenantId(tenantID);
+        deviceConfigEntity.setDeviceId(deviceID);
+
+        deviceConfig.setVersion("");
+
+    }
+
+    @BeforeEach
+    void setUp() {
+
+    }
+
+    @AfterEach
+    void tearDown() {
+        verifyNoMoreInteractions(
+                configServiceMock,
+                routerBuilderMock,
+                routingContextMock,
+                operationMock,
+                requestBodyMock,
+                jsonObjMock,
+                httpServerResponseMock,
+                illegalArgumentExceptionMock);
+    }
+
+    @Test
+    void addRoutes() {
+        when(routerBuilderMock.operation(anyString())).thenReturn(operationMock);
+        when(operationMock.handler(any())).thenReturn(operationMock);
+
+        deviceConfigsHandler.addRoutes(routerBuilderMock);
+
+        verify(routerBuilderMock, times(1)).operation(DeviceConfigsConstants.LIST_CONFIG_VERSIONS_OP_ID);
+        verify(routerBuilderMock, times(1)).operation(DeviceConfigsConstants.POST_MODIFY_DEVICE_CONFIG_OP_ID);
+        verify(operationMock, times(2)).handler(any());
+    }
+
+    @Test
+    void handleModifyCloudToDeviceConfig_success() {
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.body()).thenReturn(requestBodyMock);
+        when(requestBodyMock.asJsonObject()).thenReturn(jsonObjMock);
+        when(jsonObjMock.mapTo(DeviceConfigRequest.class)).thenReturn(deviceConfigRequest);
+        when(configServiceMock.modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID)).thenReturn(Future.succeededFuture(deviceConfigEntity));
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.setStatusCode(anyInt())).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.putHeader("Content-Type",
+                "application/json")).thenReturn(httpServerResponseMock);
+
+        var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
+
+        verify(configServiceMock).modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).body();
+        verify(requestBodyMock, times(1)).asJsonObject();
+        verify(jsonObjMock, times(1)).mapTo(DeviceConfigRequest.class);
+        verifySuccessResponse(results, deviceConfigEntity);
+
+    }
+
+
+    @Test
+    void handleModifyCloudToDeviceConfig_failure() {
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.body()).thenReturn(requestBodyMock);
+        when(requestBodyMock.asJsonObject()).thenReturn(jsonObjMock);
+        when(jsonObjMock.mapTo(DeviceConfigRequest.class)).thenReturn(deviceConfigRequest);
+        when(illegalArgumentExceptionMock.getMessage()).thenReturn(errorMsg);
+        when(configServiceMock.modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID)).thenReturn(Future.failedFuture(illegalArgumentExceptionMock));
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.setStatusCode(anyInt())).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.putHeader("Content-Type",
+                "application/json")).thenReturn(httpServerResponseMock);
+
+        var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
+
+        verify(configServiceMock).modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).body();
+        verify(requestBodyMock, times(1)).asJsonObject();
+        verify(jsonObjMock, times(1)).mapTo(DeviceConfigRequest.class);
+
+        verifyErrorResponse(results);
+
+
+    }
+
+    @Test
+    void handleListConfigVersions_success() {
+        ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = new ListDeviceConfigVersionsResponse(List.of(deviceConfig));
+        MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
+        when(routingContextMock.queryParams()).thenReturn(queryParams);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.setStatusCode(anyInt())).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.putHeader("Content-Type",
+                "application/json")).thenReturn(httpServerResponseMock);
+        when(configServiceMock.listAll(deviceID, tenantID, 10)).thenReturn(Future.succeededFuture(listDeviceConfigVersionsResponse));
+
+        var results = deviceConfigsHandler.handleListConfigVersions(routingContextMock);
+
+        verify(configServiceMock, times(1)).listAll(deviceID, tenantID, 10);
+        verify(routingContextMock, times(1)).queryParams();
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+
+        verifySuccessResponse(results, listDeviceConfigVersionsResponse);
+
+    }
+
+
+    @Test
+    void handleListConfigVersions_failed() {
+        MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
+        when(routingContextMock.queryParams()).thenReturn(queryParams);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.response()).thenReturn(httpServerResponseMock);
+        when(httpServerResponseMock.setStatusCode(anyInt())).thenReturn(httpServerResponseMock);
+        when(illegalArgumentExceptionMock.getMessage()).thenReturn(errorMsg);
+        when(httpServerResponseMock.putHeader("Content-Type",
+                "application/json")).thenReturn(httpServerResponseMock);
+        when(configServiceMock.listAll(deviceID, tenantID, 10)).thenReturn(Future.failedFuture(illegalArgumentExceptionMock));
+
+        var results = deviceConfigsHandler.handleListConfigVersions(routingContextMock);
+
+        verify(configServiceMock, times(1)).listAll(deviceID, tenantID, 10);
+        verify(routingContextMock, times(1)).queryParams();
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verifyErrorResponse(results);
+
+
+    }
+
+
+    void verifyErrorResponse(Future results) {
+        verify(routingContextMock, times(1)).response();
+        verify(httpServerResponseMock).setStatusCode(400);
+        verify(illegalArgumentExceptionMock).getMessage();
+        verify(httpServerResponseMock).putHeader("Content-Type",
+                "application/json");
+        verify(httpServerResponseMock).end(new JsonObject().put("error", errorMsg).encodePrettily());
+        Assertions.assertTrue(results.failed());
+    }
+
+    void verifySuccessResponse(Future results, Object responseObj) {
+        verify(routingContextMock, times(1)).response();
+        verify(httpServerResponseMock).setStatusCode(200);
+        verify(httpServerResponseMock).putHeader("Content-Type",
+                "application/json");
+        verify(httpServerResponseMock).end(Json.encodePrettily(responseObj));
+        Assertions.assertTrue(results.succeeded());
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
new file mode 100644
index 00000000..8fffb4a0
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
@@ -0,0 +1,81 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.core.Vertx;
+import io.vertx.pgclient.PgPool;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.utils.DbUtils;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
+
+import static org.mockito.Mockito.*;
+
+class DatabaseServiceImplTest {
+
+    private final Vertx vertxMock;
+    private final ApplicationConfig applicationConfigMock;
+
+    private final PgPool pgPoolMock;
+    private DatabaseService databaseService;
+
+    public DatabaseServiceImplTest() {
+        vertxMock = mock(Vertx.class);
+        applicationConfigMock = mock(ApplicationConfig.class);
+        pgPoolMock = mock(PgPool.class);
+
+
+    }
+
+    @AfterEach
+    void tearDown() {
+        verifyNoMoreInteractions(vertxMock, applicationConfigMock, pgPoolMock);
+
+    }
+
+
+    @Test
+    void getDbClient() {
+        try (MockedStatic<DbUtils> dbUtilsMockedStatic = mockStatic(DbUtils.class)) {
+            dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock)).thenReturn(pgPoolMock);
+            databaseService = new DatabaseServiceImpl(applicationConfigMock, vertxMock);
+
+            var client = databaseService.getDbClient();
+
+            Assertions.assertSame(client, pgPoolMock);
+
+            dbUtilsMockedStatic.verify(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock), times(1));
+            dbUtilsMockedStatic.verifyNoMoreInteractions();
+        }
+    }
+
+    @Test
+    void close() {
+
+        try (MockedStatic<DbUtils> dbUtilsMockedStatic = mockStatic(DbUtils.class)) {
+            dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock)).thenReturn(pgPoolMock);
+            databaseService = new DatabaseServiceImpl(applicationConfigMock, vertxMock);
+
+            databaseService.close();
+            verify(pgPoolMock, times(1)).close();
+            dbUtilsMockedStatic.verify(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock), times(1));
+            dbUtilsMockedStatic.verifyNoMoreInteractions();
+        }
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
new file mode 100644
index 00000000..8ecbf615
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
@@ -0,0 +1,121 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.core.Future;
+import io.vertx.pgclient.PgPool;
+import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.mapper.DeviceConfigMapper;
+import org.eclipse.hono.communication.api.repository.DeviceConfigsRepository;
+import org.eclipse.hono.communication.api.repository.DeviceConfigsRepositoryImpl;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import static org.mockito.Mockito.*;
+
+class DeviceConfigServiceImplTest {
+
+    private final DeviceConfigsRepository repositoryMock;
+    private final DatabaseService dbMock;
+    private final PgPool poolMock;
+    private final DeviceConfigMapper mapperMock;
+    private final DeviceConfigService deviceConfigService;
+
+    private final String tenantId = "tenant_ID";
+    private final String deviceId = "device_ID";
+
+    public DeviceConfigServiceImplTest() {
+        this.repositoryMock = mock(DeviceConfigsRepositoryImpl.class);
+        this.dbMock = mock(DatabaseServiceImpl.class);
+        this.mapperMock = mock(DeviceConfigMapper.class);
+        poolMock = mock(PgPool.class);
+        deviceConfigService = new DeviceConfigServiceImpl(repositoryMock, dbMock, mapperMock);
+    }
+
+
+    @AfterEach
+    void tearDown() {
+        verifyNoMoreInteractions(repositoryMock, mapperMock, dbMock);
+    }
+
+    @Test
+    void modifyCloudToDeviceConfig_success() {
+        var deviceConfigRequest = new DeviceConfigRequest();
+        var deviceConfigEntity = new DeviceConfigEntity();
+        when(mapperMock.configRequestToDeviceConfigEntity(deviceConfigRequest)).thenReturn(deviceConfigEntity);
+        when(dbMock.getDbClient()).thenReturn(poolMock);
+        when(poolMock.withTransaction(any())).thenReturn(Future.succeededFuture(deviceConfigEntity));
+
+
+        var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
+
+        verify(mapperMock, times(1)).configRequestToDeviceConfigEntity(deviceConfigRequest);
+        verify(dbMock, times(1)).getDbClient();
+        verify(poolMock, times(1)).withTransaction(any());
+        Assertions.assertTrue(results.succeeded());
+    }
+
+    @Test
+    void modifyCloudToDeviceConfig_failure() {
+        var deviceConfigRequest = new DeviceConfigRequest();
+        var deviceConfigEntity = new DeviceConfigEntity();
+        when(mapperMock.configRequestToDeviceConfigEntity(deviceConfigRequest)).thenReturn(deviceConfigEntity);
+        when(dbMock.getDbClient()).thenReturn(poolMock);
+        when(poolMock.withTransaction(any())).thenReturn(Future.failedFuture(new Throwable("test_error")));
+
+
+        var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
+
+        verify(mapperMock, times(1)).configRequestToDeviceConfigEntity(deviceConfigRequest);
+        verify(dbMock, times(1)).getDbClient();
+        verify(poolMock, times(1)).withTransaction(any());
+        Assertions.assertTrue(results.failed());
+    }
+
+    @Test
+    void listAll_success() {
+        var deviceConfigVersions = new ListDeviceConfigVersionsResponse();
+        when(dbMock.getDbClient()).thenReturn(poolMock);
+        when(poolMock.withTransaction(any())).thenReturn(Future.succeededFuture(deviceConfigVersions));
+
+        var results = deviceConfigService.listAll(deviceId, tenantId, 10);
+
+        verify(dbMock, times(1)).getDbClient();
+        verify(poolMock, times(1)).withTransaction(any());
+        Assertions.assertTrue(results.succeeded());
+
+
+    }
+
+
+    @Test
+    void listAll_failed() {
+        when(dbMock.getDbClient()).thenReturn(poolMock);
+        when(poolMock.withTransaction(any())).thenReturn(Future.failedFuture(new Throwable("test_error")));
+
+        var results = deviceConfigService.listAll(deviceId, tenantId, 10);
+
+        verify(dbMock, times(1)).getDbClient();
+        verify(poolMock, times(1)).withTransaction(any());
+        Assertions.assertTrue(results.failed());
+
+
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/test/resources/application.yaml b/device-communication/src/test/resources/application.yaml
new file mode 100644
index 00000000..a2f4cbaf
--- /dev/null
+++ b/device-communication/src/test/resources/application.yaml
@@ -0,0 +1,16 @@
+app:
+  name: "Device Communication"
+vertx:
+  openapi:
+    file: "/api/hono-device-communication-v1.yaml"
+  server:
+    url: "localhost"
+    port: 8081
+
+"%test":
+  app:
+    name: "Device Communication"
+  vertx:
+    server:
+      url: "localhost"
+      port: "8081"
\ No newline at end of file

From f0253064ee44dc90c405bdbcc7801465b3c1685e Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Fri, 10 Feb 2023 13:34:43 +0100
Subject: [PATCH 02/18] update README.md and add database functionality

---
 README.md                                     |  10 +-
 device-communication/.dockerignore            |   3 +-
 device-communication/README.md                | 116 ++++++++---
 device-communication/img.png                  | Bin 0 -> 110144 bytes
 device-communication/pom.xml                  |  79 ++++----
 .../src/main/docker/Dockerfile.legacy-jar     |   6 +-
 .../api/DeviceCommunicationHttpServer.java    |  72 ++++++-
 .../api/config/DeviceConfigsConstants.java    |   3 +
 .../api/data/DeviceCommandRequest.java        |  84 ++++++++
 .../communication/api/data/DeviceConfig.java  | 128 ++++++++++++
 .../api/data/DeviceConfigEntity.java          | 116 +++++++++++
 .../api/data/DeviceConfigRequest.java         |  84 ++++++++
 .../api/data/DeviceConfigResponse.java        |  84 ++++++++
 .../ListDeviceConfigVersionsResponse.java     |  72 +++++++
 .../api/handler/DeviceConfigsHandler.java     |  15 +-
 .../api/mapper/DeviceConfigMapper.java        |  13 +-
 .../repository/DeviceConfigsRepository.java   |   6 +-
 .../DeviceConfigsRepositoryImpl.java          | 140 ++++++-------
 .../api/service/DatabaseSchemaCreator.java    |  24 +++
 .../service/DatabaseSchemaCreatorImpl.java    |  76 +++++++
 .../api/service/DatabaseServiceImpl.java      |  16 +-
 .../api/service/DeviceConfigService.java      |   9 +-
 .../api/service/DeviceConfigServiceImpl.java  |  43 ++--
 .../core/app/DatabaseConfig.java              |  18 +-
 .../communication/core/app/ServerConfig.java  |  22 ++
 .../communication/core/utils/DbUtils.java     |  25 ++-
 .../api/hono-device-communication-v1.yaml     |  58 ++++--
 .../src/main/resources/application.yaml       |  55 +++--
 .../db/create_device_config_table.sql         |  28 +++
 .../DeviceCommunicationHttpServerTest.java    | 191 ++++++++++++------
 .../api/handler/DeviceConfigsHandlerTest.java |  13 +-
 .../DatabaseSchemaCreatorImplTest.java        |  91 +++++++++
 .../api/service/DatabaseServiceImplTest.java  |  20 +-
 .../service/DeviceConfigServiceImplTest.java  |  14 +-
 34 files changed, 1380 insertions(+), 354 deletions(-)
 create mode 100644 device-communication/img.png
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java
 create mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java
 create mode 100644 device-communication/src/main/resources/db/create_device_config_table.sql
 create mode 100644 device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java

diff --git a/README.md b/README.md
index 3a7347db..ed9bff77 100644
--- a/README.md
+++ b/README.md
@@ -8,8 +8,14 @@ Eclipse Hono Extras provides additional resources for [Eclipse Hono&trade;](http
 
 ## Hono Protocol Gateways
 
-See the [protocol-gateway](protocol-gateway) directory for a template and an example implementation for a [Hono protocol gateway](https://www.eclipse.org/hono/docs/concepts/connecting-devices/#connecting-via-a-protocol-gateway).
+See the [protocol-gateway](protocol-gateway) directory for a template and an example implementation for
+a [Hono protocol gateway](https://www.eclipse.org/hono/docs/concepts/connecting-devices/#connecting-via-a-protocol-gateway).
 
 ## Device registry migration
 
-See the [device-registry-migration](device-registry-migration) directory for example migration scripts from one device registry type to another.
+See the [device-registry-migration](device-registry-migration) directory for example migration scripts from one device
+registry type to another.
+
+## Device communication API
+
+See the [device-communication](device-communication) directory for api specifications and implementation.
diff --git a/device-communication/.dockerignore b/device-communication/.dockerignore
index 94810d00..1e5989c0 100644
--- a/device-communication/.dockerignore
+++ b/device-communication/.dockerignore
@@ -2,4 +2,5 @@
 !target/*-runner
 !target/*-runner.jar
 !target/lib/*
-!target/quarkus-app/*
\ No newline at end of file
+!target/quarkus-app/*
+!src/main/resources/*
\ No newline at end of file
diff --git a/device-communication/README.md b/device-communication/README.md
index ce13e7f2..f036816d 100644
--- a/device-communication/README.md
+++ b/device-communication/README.md
@@ -1,54 +1,104 @@
-# device-communication Project
+# Device Communication API
 
-This project uses Quarkus, the Supersonic Subatomic Java Framework.
+Device communication API enables users and applications to send configurations and commands to devices via HTTP
+endpoints.
 
-If you want to learn more about Quarkus, please visit its website: https://quarkus.io/ .
+![img.png](img.png)
 
-## Running the application in dev mode
+### Application
 
-You can run your application in dev mode that enables live coding using:
+The application is reactive and uses Quarkus Framework for the application and Vertx tools for the HTTP server.
 
-```shell script
-./mvnw compile quarkus:dev
-```
+### Hono internal communication
 
-> **_NOTE:_**  Quarkus now ships with a Dev UI, which is available in dev mode only at http://localhost:8080/q/dev/.
+API uses [Googles PubSub](https://cloud.google.com/pubsub/docs/overview?hl=de) service to communicate with the command
+router.
 
-## Packaging and running the application
+## API endpoints
 
-The application can be packaged using:
+#### commands/{tenantId}/{deviceId}
 
-```shell script
-./mvnw package
-```
+- POST : post a command for a specific device
 
-It produces the `quarkus-run.jar` file in the `target/quarkus-app/` directory.
-Be aware that it’s not an _über-jar_ as the dependencies are copied into the `target/quarkus-app/lib/` directory.
+<p>
 
-The application is now runnable using `java -jar target/quarkus-app/quarkus-run.jar`.
+#### configs/{tenantId}/{deviceId}
 
-If you want to build an _über-jar_, execute the following command:
+- GET : list of device config versions
 
-```shell script
-./mvnw package -Dquarkus.package.type=uber-jar
-```
+- POST: update or create a device config version
 
-The application, packaged as an _über-jar_, is now runnable using `java -jar target/*-runner.jar`.
+For more information please see resources/api/openApi file.
 
-## Creating a native executable
+## Database
 
-You can create a native executable using:
+Application uses PostgresSQL database. All the database configurations can be found in application.yaml file.
 
-```shell script
-./mvnw package -Pnative
-```
+### Tables
 
-Or, if you don't have GraalVM installed, you can run the native executable build in a container using:
+- DeviceConfig <br>
+  Is used for saving device config versions
+- DeviceRegistration <br>
+  Is used for validating if a device exist
 
-```shell script
-./mvnw package -Pnative -Dquarkus.native.container-build=true
-```
+### Migrations
+
+When Applications starts tables will be created by the DatabaseSchemaCreator service.
+
+### Running postgresSQL container local
+
+For running the PostgresSQL Database local with docker run:
+
+``````
+
+docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres
+
+``````
+
+After the container is running, log in to the container and with psql create the database and the tables. Then we have
+to set the application settings.
+
+Default postgresSQl values:
+
+- userName = postgres
+- password = mysecretpassword
+
+## Build and Push API Docker Image
+
+Mavens auto build and push functionality ca be enabled from application.yaml settings:
+
+````
+
+quarkus:
+  container-image:
+  builder: docker
+  build: true
+  push: true
+  image: "gcr.io/sotec-iot-core-dev/hono-device-communication"
+
+````
+
+By running maven package, install or deploy will automatically build the docker image and if push is enabled it will
+push the image
+to the given registry.
+
+## OpenApi Contract-first
+
+For creating the endpoints, Vertx takes the openApi definition file and maps every endpoint operation-ID with a specific
+Handler
+function.
+
+## Handlers
+
+Handlers are providing callBack functions for every endpoint. Functions are going to be called automatically from vertx
+server every time a request is received.
+
+## Adding a new Endpoint
+
+Adding new Endpoint steps:
+
+1. Add Endpoint in openApi file and set an operationId
+2. Use an existing const Class or create a new one under /config and set the operation id name
+3. Implement an HttpEndpointHandler and set the Routes
 
-You can then execute your native executable with: `./target/device-communication-1.0-SNAPSHOT-runner`
 
-If you want to learn more about building native executables, please consult https://quarkus.io/guides/maven-tooling.
diff --git a/device-communication/img.png b/device-communication/img.png
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HcmV?d00001

diff --git a/device-communication/pom.xml b/device-communication/pom.xml
index 3bbf3801..afa70b5e 100644
--- a/device-communication/pom.xml
+++ b/device-communication/pom.xml
@@ -64,23 +64,13 @@
             <artifactId>jackson-annotations</artifactId>
         </dependency>
         <dependency>
-            <groupId>io.quarkus</groupId>
-            <artifactId>quarkus-config-yaml</artifactId>
-        </dependency>
-
-        <!-- Flyway specific dependencies -->
-        <dependency>
-            <groupId>io.quarkus</groupId>
-            <artifactId>quarkus-flyway</artifactId>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
         </dependency>
-
-        <!-- JDBC driver dependencies -->
         <dependency>
             <groupId>io.quarkus</groupId>
-            <artifactId>quarkus-jdbc-postgresql</artifactId>
+            <artifactId>quarkus-config-yaml</artifactId>
         </dependency>
-
-
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-inline</artifactId>
@@ -113,6 +103,19 @@
             <artifactId>mapstruct</artifactId>
             <version>${org.mapstruct.version}</version>
         </dependency>
+
+        <!-- https://mvnrepository.com/artifact/io.quarkus/quarkus-container-image-docker -->
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-container-image-docker</artifactId>
+            <version>2.16.0.Final</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-health-check</artifactId>
+        </dependency>
+
+
     </dependencies>
     <build>
         <plugins>
@@ -150,15 +153,7 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${compiler-plugin.version}</version>
-                <configuration>
-                    <compilerArgs>
-                        <arg>-parameters</arg>
-                    </compilerArgs>
-                </configuration>
-            </plugin>
+
             <plugin>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>${surefire-plugin.version}</version>
@@ -171,26 +166,26 @@
 
                 </configuration>
             </plugin>
-            <plugin>
-                <artifactId>maven-failsafe-plugin</artifactId>
-                <version>${surefire-plugin.version}</version>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>integration-test</goal>
-                            <goal>verify</goal>
-                        </goals>
-                        <configuration>
-                            <systemPropertyVariables>
-                                <native.image.path>${project.build.directory}/${project.build.finalName}-runner
-                                </native.image.path>
-                                <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
-                                <maven.home>${maven.home}</maven.home>
-                            </systemPropertyVariables>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
+            <!--            <plugin>-->
+            <!--                <artifactId>maven-failsafe-plugin</artifactId>-->
+            <!--                <version>${surefire-plugin.version}</version>-->
+            <!--                <executions>-->
+            <!--                    <execution>-->
+            <!--                        <goals>-->
+            <!--                            <goal>integration-test</goal>-->
+            <!--                            <goal>verify</goal>-->
+            <!--                        </goals>-->
+            <!--                        <configuration>-->
+            <!--                            <systemPropertyVariables>-->
+            <!--                                <native.image.path>${project.build.directory}/${project.build.finalName}-runner-->
+            <!--                                </native.image.path>-->
+            <!--                                <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>-->
+            <!--                                <maven.home>${maven.home}</maven.home>-->
+            <!--                            </systemPropertyVariables>-->
+            <!--                        </configuration>-->
+            <!--                    </execution>-->
+            <!--                </executions>-->
+            <!--            </plugin>-->
         </plugins>
     </build>
     <profiles>
diff --git a/device-communication/src/main/docker/Dockerfile.legacy-jar b/device-communication/src/main/docker/Dockerfile.legacy-jar
index e1a0c7e6..108988bd 100644
--- a/device-communication/src/main/docker/Dockerfile.legacy-jar
+++ b/device-communication/src/main/docker/Dockerfile.legacy-jar
@@ -75,11 +75,15 @@
 #   accessed directly. (example: "foo.example.com,bar.example.com")
 #
 ###
-FROM registry.access.redhat.com/ubi8/openjdk-17:1.14
+FROM registry.access.redhat.com/ubi8/openjdk-17:1.14-10
 
 ENV LANGUAGE='en_US:en'
 
+RUN mkdir api/
+RUN mkdir db/
 
+COPY target/classes/api/* /api/
+COPY target/classes/db/* /db/
 COPY target/lib/* /deployments/lib/
 COPY target/*-runner.jar /deployments/quarkus-run.jar
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index 95086423..dd631f3f 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -21,16 +21,21 @@
 import io.vertx.core.Vertx;
 import io.vertx.core.http.HttpMethod;
 import io.vertx.core.http.HttpServerOptions;
+import io.vertx.ext.healthchecks.HealthCheckHandler;
+import io.vertx.ext.healthchecks.Status;
 import io.vertx.ext.web.Router;
 import io.vertx.ext.web.RoutingContext;
 import io.vertx.ext.web.openapi.RouterBuilder;
 import io.vertx.ext.web.validation.BadRequestException;
+import org.eclipse.hono.communication.api.service.DatabaseSchemaCreator;
 import org.eclipse.hono.communication.api.service.DatabaseService;
 import org.eclipse.hono.communication.api.service.VertxHttpHandlerManagerService;
 import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.app.ServerConfig;
 import org.eclipse.hono.communication.core.http.AbstractVertxHttpServer;
 import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
 import org.eclipse.hono.communication.core.http.HttpServer;
+import org.eclipse.hono.communication.core.utils.ResponseUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -50,15 +55,18 @@ public class DeviceCommunicationHttpServer extends AbstractVertxHttpServer imple
     private final VertxHttpHandlerManagerService httpHandlerManager;
 
     private final DatabaseService db;
+    private final DatabaseSchemaCreator databaseSchemaCreator;
     private List<HttpEndpointHandler> httpEndpointHandlers;
 
 
     public DeviceCommunicationHttpServer(ApplicationConfig appConfigs,
                                          Vertx vertx,
                                          VertxHttpHandlerManagerService httpHandlerManager,
-                                         DatabaseService databaseService) {
+                                         DatabaseService databaseService,
+                                         DatabaseSchemaCreator databaseSchemaCreator) {
         super(appConfigs, vertx);
         this.httpHandlerManager = httpHandlerManager;
+        this.databaseSchemaCreator = databaseSchemaCreator;
         this.httpEndpointHandlers = new ArrayList<>();
         this.db = databaseService;
     }
@@ -66,6 +74,10 @@ public DeviceCommunicationHttpServer(ApplicationConfig appConfigs,
 
     @Override
     public void start() {
+        //Create Database Tables
+        databaseSchemaCreator.createDBTables();
+
+        // Create Endpoints Router
         this.httpEndpointHandlers = httpHandlerManager.getAvailableHandlerServices();
         RouterBuilder.create(this.vertx, appConfigs.getServerConfig().getOpenApiFilePath())
                 .onSuccess(routerBuilder ->
@@ -80,6 +92,8 @@ public void start() {
                     } else {
                         log.error("Can not create Router");
                     }
+                    stop();
+                    Quarkus.asyncExit(-1);
 
                 });
 
@@ -99,8 +113,62 @@ Router createRouterWithEndpoints(RouterBuilder routerBuilder, List<HttpEndpointH
         for (HttpEndpointHandler handlerService : httpEndpointHandlers) {
             handlerService.addRoutes(routerBuilder);
         }
+        var apiRouter = Router.router(vertx);
+        var router = routerBuilder.createRouter();
+        apiRouter.errorHandler(400, routingContext ->
+                ResponseUtils.errorResponse(routingContext, routingContext.failure()));
+        apiRouter.errorHandler(404, routingContext ->
+                ResponseUtils.errorResponse(routingContext, routingContext.failure()));
+
+        var serverConfig = appConfigs.getServerConfig();
+        addHealthCheckHandles(apiRouter, serverConfig);
+
+        apiRouter.route(
+                String.format("%s*", serverConfig.getBasePath()) // absolut path not allowed only /*
+        ).subRouter(router);
+        return apiRouter;
+    }
+
+    /**
+     * Adds readiness and liveness handlers
+     *
+     * @param router Created router object
+     */
+    private void addHealthCheckHandles(Router router, ServerConfig serverConfig) {
+        addReadinessHandles(router, serverConfig.getReadinessPath());
+        addLivenessHandles(router, serverConfig.getLivenessPath());
+    }
+
+    private void addReadinessHandles(Router router, String readinessPath) {
+        log.info("Adding readiness path: {}", readinessPath);
+        final HealthCheckHandler healthCheckHandler = HealthCheckHandler.create(vertx);
+
+        healthCheckHandler.register("database-communication-is-ready",
+                promise ->
+                        db.getDbClient().getConnection(connection -> {
+                            if (connection.failed()) {
+                                log.error(connection.cause().getMessage());
+                                promise.tryComplete(Status.KO());
+                            } else {
+                                connection.result().close();
+                                promise.tryComplete(Status.OK());
+                            }
+                        })
+        );
+
+        router.get(readinessPath).handler(healthCheckHandler);
+    }
+
+
+    private void addLivenessHandles(Router router, String livenessPath) {
+        log.info("Adding liveness path: {}", livenessPath);
+        final HealthCheckHandler healthCheckHandler = HealthCheckHandler.create(vertx);
+
+        healthCheckHandler.register("liveness",
+                promise -> promise.tryComplete(Status.OK())
+        );
 
-        return routerBuilder.createRouter();
+        router.get(livenessPath).handler(healthCheckHandler);
     }
 
     /**
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
index b12e3ddf..89f3936f 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
@@ -24,7 +24,10 @@ public class DeviceConfigsConstants {
     // Open api operationIds
     public final static String POST_MODIFY_DEVICE_CONFIG_OP_ID = "modifyCloudToDeviceConfig";
     public final static String LIST_CONFIG_VERSIONS_OP_ID = "listConfigVersions";
+    
+    //Device Config Repository
     public final static String TENANT_PATH_PARAMETER = "tenantid";
     public final static String DEVICE_PATH_PARAMETER = "deviceid";
     public final static String NUM_VERSION_QUERY_PARAMS = "numVersions";
+    public final static String CREATE_SQL_SCRIPT_PATH = "db/create_device_config_table.sql";
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java
new file mode 100644
index 00000000..27a253be
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java
@@ -0,0 +1,84 @@
+package org.eclipse.hono.communication.api.data;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.Objects;
+
+/**
+ * Command json object structure
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class DeviceCommandRequest {
+
+    private String binaryData;
+    private String subfolder;
+
+    public DeviceCommandRequest() {
+
+    }
+
+    public DeviceCommandRequest(String binaryData, String subfolder) {
+        this.binaryData = binaryData;
+        this.subfolder = subfolder;
+    }
+
+
+    @JsonProperty("binaryData")
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @JsonProperty("subfolder")
+    public String getSubfolder() {
+        return subfolder;
+    }
+
+    public void setSubfolder(String subfolder) {
+        this.subfolder = subfolder;
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DeviceCommandRequest deviceCommandRequest = (DeviceCommandRequest) o;
+        return Objects.equals(binaryData, deviceCommandRequest.binaryData) &&
+                Objects.equals(subfolder, deviceCommandRequest.subfolder);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(binaryData, subfolder);
+    }
+
+    @Override
+    public String toString() {
+
+        return "class DeviceCommandRequest {\n" +
+                "    binaryData: " + toIndentedString(binaryData) + "\n" +
+                "    subfolder: " + toIndentedString(subfolder) + "\n" +
+                "}";
+    }
+
+    /**
+     * Convert the given object to string with each line indented by 4 spaces
+     * (except the first line).
+     */
+    private String toIndentedString(Object o) {
+        if (o == null) {
+            return "null";
+        }
+        return o.toString().replace("\n", "\n    ");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
new file mode 100644
index 00000000..509f920a
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
@@ -0,0 +1,128 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.data;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.Objects;
+
+/**
+ * The device configuration.
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class DeviceConfig {
+
+    private String version;
+    private String cloudUpdateTime;
+    private String deviceAckTime;
+    private String binaryData;
+
+    public DeviceConfig() {
+
+    }
+
+    public DeviceConfig(String version, String cloudUpdateTime, String deviceAckTime, String binaryData) {
+        this.version = version;
+        this.cloudUpdateTime = cloudUpdateTime;
+        this.deviceAckTime = deviceAckTime;
+        this.binaryData = binaryData;
+    }
+
+
+    @JsonProperty("version")
+    public String getVersion() {
+        return version;
+    }
+
+    public void setVersion(String version) {
+        this.version = version;
+    }
+
+
+    @JsonProperty("cloudUpdateTime")
+    public String getCloudUpdateTime() {
+        return cloudUpdateTime;
+    }
+
+    public void setCloudUpdateTime(String cloudUpdateTime) {
+        this.cloudUpdateTime = cloudUpdateTime;
+    }
+
+
+    @JsonProperty("deviceAckTime")
+    public String getDeviceAckTime() {
+        return deviceAckTime;
+    }
+
+    public void setDeviceAckTime(String deviceAckTime) {
+        this.deviceAckTime = deviceAckTime;
+    }
+
+
+    @JsonProperty("binaryData")
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DeviceConfig deviceConfig = (DeviceConfig) o;
+        return Objects.equals(version, deviceConfig.version) &&
+                Objects.equals(cloudUpdateTime, deviceConfig.cloudUpdateTime) &&
+                Objects.equals(deviceAckTime, deviceConfig.deviceAckTime) &&
+                Objects.equals(binaryData, deviceConfig.binaryData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(version, cloudUpdateTime, deviceAckTime, binaryData);
+    }
+
+    @Override
+    public String toString() {
+
+        return "class DeviceConfig {\n" +
+                "    version: " + toIndentedString(version) + "\n" +
+                "    cloudUpdateTime: " + toIndentedString(cloudUpdateTime) + "\n" +
+                "    deviceAckTime: " + toIndentedString(deviceAckTime) + "\n" +
+                "    binaryData: " + toIndentedString(binaryData) + "\n" +
+                "}";
+    }
+
+    /**
+     * Convert the given object to string with each line indented by 4 spaces
+     * (except the first line).
+     */
+    private String toIndentedString(Object o) {
+        if (o == null) {
+            return "null";
+        }
+        return o.toString().replace("\n", "\n    ");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java
new file mode 100644
index 00000000..69a3d87b
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java
@@ -0,0 +1,116 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.data;
+
+import java.util.Objects;
+
+/**
+ * The device configuration entity object.
+ **/
+public class DeviceConfigEntity {
+
+
+    private int version;
+    private String tenantId;
+    private String deviceId;
+
+    private String cloudUpdateTime;
+    private String deviceAckTime;
+    private String binaryData;
+
+ 
+    public DeviceConfigEntity() {
+    }
+
+
+    public int getVersion() {
+        return version;
+    }
+
+    public void setVersion(int version) {
+        this.version = version;
+    }
+
+    public String getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(String tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public String getDeviceId() {
+        return deviceId;
+    }
+
+    public void setDeviceId(String deviceId) {
+        this.deviceId = deviceId;
+    }
+
+
+    public String getCloudUpdateTime() {
+        return cloudUpdateTime;
+    }
+
+    public void setCloudUpdateTime(String cloudUpdateTime) {
+        this.cloudUpdateTime = cloudUpdateTime;
+    }
+
+    public String getDeviceAckTime() {
+        return deviceAckTime;
+    }
+
+    public void setDeviceAckTime(String deviceAckTime) {
+        this.deviceAckTime = deviceAckTime;
+    }
+
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @Override
+    public String toString() {
+        return "DeviceConfigEntity{" +
+                "version=" + version +
+                ", tenantId='" + tenantId + '\'' +
+                ", deviceId='" + deviceId + '\'' +
+                ", cloudUpdateTime='" + cloudUpdateTime + '\'' +
+                ", deviceAckTime='" + deviceAckTime + '\'' +
+                ", binaryData='" + binaryData + '\'' +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DeviceConfigEntity that = (DeviceConfigEntity) o;
+        return version == that.version && tenantId.equals(that.tenantId) && deviceId.equals(that.deviceId) && cloudUpdateTime.equals(that.cloudUpdateTime) && Objects.equals(deviceAckTime, that.deviceAckTime) && binaryData.equals(that.binaryData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(version, tenantId, deviceId, cloudUpdateTime, deviceAckTime, binaryData);
+    }
+
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java
new file mode 100644
index 00000000..7520dd34
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java
@@ -0,0 +1,84 @@
+package org.eclipse.hono.communication.api.data;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.Objects;
+
+/**
+ * Request body for modifying device configs
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class DeviceConfigRequest {
+
+    private String versionToUpdate;
+    private String binaryData;
+
+    public DeviceConfigRequest() {
+
+    }
+
+    public DeviceConfigRequest(String versionToUpdate, String binaryData) {
+        this.versionToUpdate = versionToUpdate;
+        this.binaryData = binaryData;
+    }
+
+
+    @JsonProperty("versionToUpdate")
+    public String getVersionToUpdate() {
+        return versionToUpdate;
+    }
+
+    public void setVersionToUpdate(String versionToUpdate) {
+        this.versionToUpdate = versionToUpdate;
+    }
+
+
+    @JsonProperty("binaryData")
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DeviceConfigRequest deviceConfigRequest = (DeviceConfigRequest) o;
+        return Objects.equals(versionToUpdate, deviceConfigRequest.versionToUpdate) &&
+                Objects.equals(binaryData, deviceConfigRequest.binaryData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(versionToUpdate, binaryData);
+    }
+
+    @Override
+    public String toString() {
+
+        return "class DeviceConfigRequest {\n" +
+                "    versionToUpdate: " + toIndentedString(versionToUpdate) + "\n" +
+                "    binaryData: " + toIndentedString(binaryData) + "\n" +
+                "}";
+    }
+
+    /**
+     * Convert the given object to string with each line indented by 4 spaces
+     * (except the first line).
+     */
+    private String toIndentedString(Object o) {
+        if (o == null) {
+            return "null";
+        }
+        return o.toString().replace("\n", "\n    ");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
new file mode 100644
index 00000000..d17b5902
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
@@ -0,0 +1,84 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.data;
+
+import java.util.Objects;
+
+/**
+ * The device configuration entity object.
+ **/
+public class DeviceConfigResponse {
+
+
+    private int version;
+    private String cloudUpdateTime;
+    private String binaryData;
+
+  
+    public DeviceConfigResponse() {
+    }
+
+
+    public int getVersion() {
+        return version;
+    }
+
+    public void setVersion(int version) {
+        this.version = version;
+    }
+
+    public String getCloudUpdateTime() {
+        return cloudUpdateTime;
+    }
+
+    public void setCloudUpdateTime(String cloudUpdateTime) {
+        this.cloudUpdateTime = cloudUpdateTime;
+    }
+
+    public String getBinaryData() {
+        return binaryData;
+    }
+
+    public void setBinaryData(String binaryData) {
+        this.binaryData = binaryData;
+    }
+
+
+    @Override
+    public String toString() {
+        return "DeviceConfigEntity{" +
+                "version=" + version +
+                ", cloudUpdateTime='" + cloudUpdateTime + '\'' +
+                ", binaryData='" + binaryData + '\'' +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DeviceConfigResponse that = (DeviceConfigResponse) o;
+        return version == that.version && cloudUpdateTime.equals(that.cloudUpdateTime) && binaryData.equals(that.binaryData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(version, cloudUpdateTime, binaryData);
+    }
+
+
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java
new file mode 100644
index 00000000..2d4f5570
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java
@@ -0,0 +1,72 @@
+package org.eclipse.hono.communication.api.data;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * A list of a device config versions
+ **/
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class ListDeviceConfigVersionsResponse {
+
+    private List<DeviceConfig> deviceConfigs = new ArrayList<>();
+
+    public ListDeviceConfigVersionsResponse() {
+
+    }
+
+    public ListDeviceConfigVersionsResponse(List<DeviceConfig> deviceConfigs) {
+        this.deviceConfigs = deviceConfigs;
+    }
+
+
+    @JsonProperty("deviceConfigs")
+    public List<DeviceConfig> getDeviceConfigs() {
+        return deviceConfigs;
+    }
+
+    public void setDeviceConfigs(List<DeviceConfig> deviceConfigs) {
+        this.deviceConfigs = deviceConfigs;
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = (ListDeviceConfigVersionsResponse) o;
+        return Objects.equals(deviceConfigs, listDeviceConfigVersionsResponse.deviceConfigs);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(deviceConfigs);
+    }
+
+    @Override
+    public String toString() {
+
+        return "class ListDeviceConfigVersionsResponse {\n" +
+                "    deviceConfigs: " + toIndentedString(deviceConfigs) + "\n" +
+                "}";
+    }
+
+    /**
+     * Convert the given object to string with each line indented by 4 spaces
+     * (except the first line).
+     */
+    private String toIndentedString(Object o) {
+        if (o == null) {
+            return "null";
+        }
+        return o.toString().replace("\n", "\n    ");
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
index b20b1021..c706f68a 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
@@ -16,14 +16,13 @@
 
 package org.eclipse.hono.communication.api.handler;
 
-import io.vertx.codegen.annotations.Nullable;
 import io.vertx.core.Future;
 import io.vertx.ext.web.RoutingContext;
 import io.vertx.ext.web.openapi.RouterBuilder;
 import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
+import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.service.DeviceConfigService;
 import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
 import org.eclipse.hono.communication.core.utils.ResponseUtils;
@@ -36,8 +35,6 @@
 @ApplicationScoped
 public class DeviceConfigsHandler implements HttpEndpointHandler {
 
-    private final String QUERY_PARAMS_NUM_VERSION = "numVersions";
-
     private final DeviceConfigService configService;
 
     public DeviceConfigsHandler(DeviceConfigService configService) {
@@ -53,7 +50,7 @@ public void addRoutes(RouterBuilder routerBuilder) {
                 .handler(this::handleModifyCloudToDeviceConfig);
     }
 
-    public Future<@Nullable DeviceConfigEntity> handleModifyCloudToDeviceConfig(RoutingContext routingContext) {
+    public Future<DeviceConfigResponse> handleModifyCloudToDeviceConfig(RoutingContext routingContext) {
         var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
         var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
 
@@ -67,7 +64,9 @@ public void addRoutes(RouterBuilder routerBuilder) {
     }
 
     public Future<ListDeviceConfigVersionsResponse> handleListConfigVersions(RoutingContext routingContext) {
-        var limit = Integer.parseInt(routingContext.queryParams().get(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS));
+        var numVersions = routingContext.queryParams().get(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS);
+
+        var limit = numVersions == null ? 0 : Integer.parseInt(numVersions);
         var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
         var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
index cc009ad5..0a465125 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
@@ -16,9 +16,9 @@
 
 package org.eclipse.hono.communication.api.mapper;
 
-import org.eclipse.hono.communication.api.entity.DeviceConfig;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.mapstruct.Mapper;
 import org.mapstruct.Mapping;
 import org.mapstruct.NullValuePropertyMappingStrategy;
@@ -29,14 +29,9 @@
         nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
 public interface DeviceConfigMapper {
 
-    DeviceConfigEntity deviceConfigToEntity(DeviceConfig deviceConfig);
 
+    DeviceConfigResponse deviceConfigEntityToResponse(DeviceConfigEntity entity);
 
-    DeviceConfig entityToDeviceConfig(DeviceConfigEntity entity);
-
-    @Mapping(target = "version", source = "request.versionToUpdate")
-    @Mapping(target = "cloudUpdateTime", expression = "java(getDateTime())")
-    DeviceConfig configRequestToDeviceConfig(DeviceConfigRequest request);
 
     @Mapping(target = "version", source = "request.versionToUpdate")
     @Mapping(target = "cloudUpdateTime", expression = "java(getDateTime())")
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
index 34c0bec0..f1e7effa 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
@@ -18,8 +18,8 @@
 
 import io.vertx.core.Future;
 import io.vertx.sqlclient.SqlConnection;
-import org.eclipse.hono.communication.api.entity.DeviceConfig;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.data.DeviceConfig;
+import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
 
 import java.util.List;
 
@@ -30,5 +30,5 @@ public interface DeviceConfigsRepository {
 
     Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit);
 
-    Future<DeviceConfigEntity> createOrUpdate(SqlConnection sqlConnection, DeviceConfigEntity entity);
+    Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceConfigEntity entity);
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
index 777be10d..24d9e960 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
@@ -23,9 +23,10 @@
 import io.vertx.sqlclient.SqlConnection;
 import io.vertx.sqlclient.templates.RowMapper;
 import io.vertx.sqlclient.templates.SqlTemplate;
-import org.eclipse.hono.communication.api.entity.DeviceConfig;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.data.DeviceConfig;
+import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
 import org.eclipse.hono.communication.core.app.DatabaseConfig;
+import org.graalvm.collections.Pair;
 
 import javax.enterprise.context.ApplicationScoped;
 import java.util.ArrayList;
@@ -39,18 +40,19 @@
 public class DeviceConfigsRepositoryImpl implements DeviceConfigsRepository {
     private final static String SQL_INSERT = "INSERT INTO \"deviceConfig\" (version, \"tenantId\", \"deviceId\", \"cloudUpdateTime\", \"deviceAckTime\", \"binaryData\") " +
             "VALUES (#{version}, #{tenantId}, #{deviceId}, #{cloudUpdateTime}, #{deviceAckTime}, #{binaryData}) RETURNING version";
-    private final static String SQL_UPDATE = "UPDATE \"deviceConfig\" SET \"cloudUpdateTime\" = #{cloudUpdateTime}, \"deviceAckTime\" = #{deviceAckTime}, " +
-            "\"binaryData\" = #{binaryData} WHERE version = #{version} and \"tenantId\" = #{tenantId} and \"deviceId\" = #{deviceId}";
     private final static String SQL_LIST = "SELECT version, \"cloudUpdateTime\", COALESCE(\"deviceAckTime\",'') AS  \"deviceAckTime\", \"binaryData\" " +
             "FROM \"deviceConfig\" WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId} ORDER BY version DESC LIMIT #{limit}";
-    private final static String SQL_FIND_MAX_VERSION = "SELECT COALESCE(max(version), 0) AS version from \"deviceConfig\" " +
+    private final static String SQL_DELETE_MIN_VERSION = "DELETE FROM \"deviceConfig\" WHERE\"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId} " +
+            "and version = (SELECT MIN(version) from  \"deviceConfig\" WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId})  RETURNING version";
+    private final static String SQL_FIND_TOTAL_AND_MAX_VERSION = "SELECT COALESCE(COUNT(*), 0) as total, COALESCE(MAX(version), 0) as max_version from \"deviceConfig\" " +
             "WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId}";
-    private final Logger log = LoggerFactory.getLogger(DeviceConfigsRepositoryImpl.class);
-    private final DatabaseConfig databaseConfig;
-    private String SQL_COUNT_DEVICES_WITH_PK_FILTER = "SELECT COUNT(*) as total FROM %s where %s = #{tenantId} and %s = #{deviceId}";
+
+    private final static int MAX_LIMIT = 10;
+    private final static Logger log = LoggerFactory.getLogger(DeviceConfigsRepositoryImpl.class);
+    private String SQL_COUNT_DEVICES_WITH_PK_FILTER = "SELECT COUNT(*) as total FROM public.%s where %s = #{tenantId} and %s = #{deviceId}";
+
 
     public DeviceConfigsRepositoryImpl(DatabaseConfig databaseConfig) {
-        this.databaseConfig = databaseConfig;
 
         SQL_COUNT_DEVICES_WITH_PK_FILTER = String.format(SQL_COUNT_DEVICES_WITH_PK_FILTER,
                 databaseConfig.getDeviceRegistrationTableName(),
@@ -59,7 +61,7 @@ public DeviceConfigsRepositoryImpl(DatabaseConfig databaseConfig) {
     }
 
 
-    private Future<Integer> countDevices(SqlConnection sqlConnection, String deviceId, String tenantId) {
+    private Future<Integer> searchForDevice(SqlConnection sqlConnection, String deviceId, String tenantId) {
         final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("total");
         return SqlTemplate
                 .forQuery(sqlConnection, SQL_COUNT_DEVICES_WITH_PK_FILTER)
@@ -71,6 +73,19 @@ private Future<Integer> countDevices(SqlConnection sqlConnection, String deviceI
 
     }
 
+    private Future<Pair<Integer, Integer>> findMaxVersionAndTotalEntries(SqlConnection sqlConnection, String deviceId, String tenantId) {
+        final RowMapper<Pair<Integer, Integer>> ROW_MAPPER = row ->
+                Pair.create(row.getInteger("total"), row.getInteger("max_version"));
+        return SqlTemplate
+                .forQuery(sqlConnection, SQL_FIND_TOTAL_AND_MAX_VERSION)
+                .mapTo(ROW_MAPPER)
+                .execute(Map.of("deviceId", deviceId, "tenantId", tenantId)).map(rowSet -> {
+                    final RowIterator<Pair<Integer, Integer>> iterator = rowSet.iterator();
+                    return iterator.next();
+                });
+
+    }
+
     /**
      * Lists all config versions for a specific device. Result is order by version desc
      *
@@ -81,10 +96,12 @@ private Future<Integer> countDevices(SqlConnection sqlConnection, String deviceI
      * @return A Future with a List of DeviceConfigs
      */
     public Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit) {
+        int queryLimit = limit == 0 ? MAX_LIMIT : limit;
+
         return SqlTemplate
                 .forQuery(sqlConnection, SQL_LIST)
                 .mapTo(DeviceConfig.class)
-                .execute(Map.of("limit", limit, "deviceId", deviceId, "tenantId", tenantId))
+                .execute(Map.of("deviceId", deviceId, "tenantId", tenantId, "limit", queryLimit))
                 .map(rowSet -> {
                     final List<DeviceConfig> configs = new ArrayList<>();
                     rowSet.forEach(configs::add);
@@ -96,107 +113,90 @@ public Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String de
                 .onFailure(throwable -> log.error("Error: {}", throwable));
     }
 
+
     /**
-     * Updates an entity for a given version
+     * Inserts a new entity in to the db.
      *
      * @param sqlConnection The sql connection instance
      * @param entity        The instance to insert
      * @return A Future of the created DeviceConfigEntity
      */
-    private Future<DeviceConfigEntity> update(SqlConnection sqlConnection, DeviceConfigEntity entity) {
-
+    private Future<DeviceConfigEntity> insert(SqlConnection sqlConnection, DeviceConfigEntity entity) {
         return SqlTemplate
-                .forQuery(sqlConnection, SQL_UPDATE)
+                .forUpdate(sqlConnection, SQL_INSERT)
                 .mapFrom(DeviceConfigEntity.class)
+                .mapTo(DeviceConfigEntity.class)
                 .execute(entity)
                 .map(rowSet -> {
-                    if (rowSet.rowCount() > 0) {
+                    final RowIterator<DeviceConfigEntity> iterator = rowSet.iterator();
+                    if (iterator.hasNext()) {
+                        entity.setVersion(iterator.next().getVersion());
                         return entity;
                     } else {
-                        throw new IllegalStateException(String.format("Device config version doesn't exist: %s", entity));
+                        throw new IllegalStateException(String.format("Can't create device config: %s", entity));
                     }
                 })
-                .onSuccess(success -> log.info(String.format("Device config updated successfully: %s", success.toString())))
-                .onFailure(throwable -> log.error("Error: {}", throwable));
+                .onSuccess(success -> log.info(String.format("Device config created successfully: %s", success.toString())))
+                .onFailure(throwable -> log.error(throwable.getMessage()));
+
     }
 
     /**
-     * Increases the version number and creates a new entity.
+     * Delete the smallest config version
      *
      * @param sqlConnection The sql connection instance
-     * @param entity        The instance to insert
-     * @return A Future of the created DeviceConfigEntity
+     * @param entity        The device config for searching and deleting the smallest version
+     * @return A Future of the deleted version
      */
-    private Future<DeviceConfigEntity> create(SqlConnection sqlConnection, DeviceConfigEntity entity) {
-        final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("version");
 
+    private Future<Integer> deleteMinVersion(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+        final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("version");
         return SqlTemplate
-                .forQuery(sqlConnection, SQL_FIND_MAX_VERSION)
+                .forQuery(sqlConnection, SQL_DELETE_MIN_VERSION)
                 .mapFrom(DeviceConfigEntity.class)
                 .mapTo(ROW_MAPPER)
                 .execute(entity)
                 .map(rowSet -> {
                     final RowIterator<Integer> iterator = rowSet.iterator();
-                    return iterator.hasNext() ? iterator.next() + 1 : 1;
-                }).compose(maxResults -> {
-                            entity.setVersion(maxResults);
-                            return insertEntity(sqlConnection, entity);
-                        }
-                )
-                .onSuccess(success -> log.info(String.format("Device configs created successfully: %s", success.toString())))
-                .onFailure(throwable -> log.error("Error: {}", throwable));
-    }
-
-    /**
-     * Inserts an entity to Database
-     *
-     * @param sqlConnection The sql connection instance
-     * @param entity        The instance to insert
-     * @return A Future of the created DeviceConfigEntity
-     */
-    private Future<DeviceConfigEntity> insertEntity(SqlConnection sqlConnection, DeviceConfigEntity entity) {
-        return SqlTemplate
-                .forUpdate(sqlConnection, SQL_INSERT)
-                .mapFrom(DeviceConfigEntity.class)
-                .mapTo(DeviceConfigEntity.class)
-                .execute(entity)
-                .map(rowSet -> {
-                    final RowIterator<DeviceConfigEntity> iterator = rowSet.iterator();
-                    if (iterator.hasNext()) {
-                        entity.setVersion(iterator.next().getVersion());
-                        return entity;
-                    } else {
-                        throw new IllegalStateException(String.format("Can't create device config: %s", entity));
-                    }
-                });
+                    return iterator.next();
+                })
+                .onSuccess(deletedVersion -> log.info(String.format("Device config version %s was deleted", deletedVersion)));
     }
 
 
     /**
-     * Creates a new config if version is 0 else updates the current config
+     * Creates a new config version and deletes the oldest version if the total num of versions in DB is bigger than the MAX_LIMIT.
      *
      * @param sqlConnection The sql connection instance
      * @param entity        The instance to insert
      * @return A Future of the created DeviceConfigEntity
      */
-    public Future<DeviceConfigEntity> createOrUpdate(SqlConnection sqlConnection, DeviceConfigEntity entity) {
-        return countDevices(sqlConnection, entity.getDeviceId(), entity.getTenantId())
+    public Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+        return searchForDevice(sqlConnection, entity.getDeviceId(), entity.getTenantId())
                 .compose(
                         counter -> {
                             if (counter < 1) {
                                 throw new IllegalStateException(String.format("Device with id %s and tenant id %s doesn't exist",
                                         entity.getDeviceId(),
                                         entity.getTenantId()));
-                            } else {
-
-                                if (entity.getVersion() == 0) {
-                                    return create(sqlConnection, entity);
-                                } else if (entity.getVersion() > 0) {
-                                    return update(sqlConnection, entity);
-                                } else {
-                                    throw new IllegalStateException("Config version must be >= 0");
-                                }
                             }
-                        });
+                            return findMaxVersionAndTotalEntries(sqlConnection, entity.getDeviceId(), entity.getTenantId())
+                                    .compose(
+                                            values -> {
+                                                int total = values.getLeft();
+                                                int maxVersion = values.getRight();
+
+                                                entity.setVersion(maxVersion + 1);
+
+                                                if (total > MAX_LIMIT - 1) {
+                                                    return deleteMinVersion(sqlConnection, entity).compose(
+                                                            ok -> insert(sqlConnection, entity)
+
+                                                    );
+                                                }
+                                                return insert(sqlConnection, entity);
+                                            }
+                                    );
+                        }).onFailure(error -> log.error(error.getMessage()));
     }
 }
\ No newline at end of file
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java
new file mode 100644
index 00000000..f880beb7
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java
@@ -0,0 +1,24 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+/**
+ * Interface for creating Database Tables at application startup
+ */
+public interface DatabaseSchemaCreator {
+    void createDBTables();
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java
new file mode 100644
index 00000000..60a93326
--- /dev/null
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java
@@ -0,0 +1,76 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.quarkus.runtime.Quarkus;
+import io.vertx.core.Promise;
+import io.vertx.core.Vertx;
+import io.vertx.core.buffer.Buffer;
+import io.vertx.sqlclient.templates.SqlTemplate;
+import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.enterprise.context.ApplicationScoped;
+import java.util.Map;
+
+/**
+ * Creates all Database tables if they are not exist
+ */
+
+@ApplicationScoped
+public class DatabaseSchemaCreatorImpl implements DatabaseSchemaCreator {
+    private static final Logger log = LoggerFactory.getLogger(DatabaseSchemaCreatorImpl.class);
+    private final Vertx vertx;
+    private final String tableCreationErrorMsg = "Table deviceConfig can not be created {}";
+    private final String tableCreationSuccessMsg = "Successfully migrate Table: deviceConfig.";
+    private final DatabaseService db;
+
+
+    public DatabaseSchemaCreatorImpl(Vertx vertx, DatabaseService db) {
+        this.vertx = vertx;
+        this.db = db;
+    }
+
+    public void createDBTables() {
+        createDeviceConfigTable();
+    }
+
+
+    private void createDeviceConfigTable() {
+        log.info("Running database migration from file {}", DeviceConfigsConstants.CREATE_SQL_SCRIPT_PATH);
+
+        final Promise<Buffer> loadScriptTracker = Promise.promise();
+        vertx.fileSystem().readFile(DeviceConfigsConstants.CREATE_SQL_SCRIPT_PATH, loadScriptTracker);
+        db.getDbClient().withTransaction(
+                        sqlConnection ->
+                                loadScriptTracker.future()
+                                        .map(Buffer::toString)
+                                        .compose(script -> SqlTemplate
+                                                .forQuery(sqlConnection, script)
+                                                .execute(Map.of())))
+                .onSuccess(ok -> log.info(tableCreationSuccessMsg))
+                .onFailure(error ->
+                {
+                    log.error(tableCreationErrorMsg, error.getMessage());
+                    db.close();
+                    Quarkus.asyncExit(-1);
+                });
+
+
+    }
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
index a899e8c5..5bda32cb 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
@@ -20,7 +20,7 @@
 import io.vertx.core.impl.logging.Logger;
 import io.vertx.core.impl.logging.LoggerFactory;
 import io.vertx.pgclient.PgPool;
-import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
 import org.eclipse.hono.communication.core.utils.DbUtils;
 
 import javax.enterprise.context.ApplicationScoped;
@@ -32,16 +32,14 @@
 @ApplicationScoped
 public class DatabaseServiceImpl implements DatabaseService {
 
+    private final static String databaseConnectionOpenMsg = "Database connection is open.";
+    private final static String databaseConnectionCloseMsg = "Database connection is closed.";
     private final Logger log = LoggerFactory.getLogger(DatabaseServiceImpl.class);
-    private final ApplicationConfig appConfigs;
-    private final Vertx vertx;
     private final PgPool dbClient;
 
-    public DatabaseServiceImpl(ApplicationConfig appConfigs, Vertx vertx) {
-        this.appConfigs = appConfigs;
-        this.vertx = vertx;
-        this.dbClient = DbUtils.createDbClient(vertx, appConfigs);
-        log.debug("Database connection is open.");
+    public DatabaseServiceImpl(DatabaseConfig databaseConfigs, Vertx vertx) {
+        this.dbClient = DbUtils.createDbClient(vertx, databaseConfigs);
+        log.debug(databaseConnectionOpenMsg);
     }
 
     /**
@@ -59,7 +57,7 @@ public PgPool getDbClient() {
     public void close() {
         if (this.dbClient != null) {
             this.dbClient.close();
-            log.debug("Database connection is closed.");
+            log.info(databaseConnectionCloseMsg);
         }
     }
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
index e9072881..e1870f84 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
@@ -16,18 +16,17 @@
 
 package org.eclipse.hono.communication.api.service;
 
-import io.vertx.codegen.annotations.Nullable;
 import io.vertx.core.Future;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
+import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 
 /**
  * Device config interface
  */
 public interface DeviceConfigService {
 
-    Future<@Nullable DeviceConfigEntity> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId);
+    Future<DeviceConfigResponse> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId);
 
     Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit);
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
index 9beeac2e..2374c51f 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
@@ -17,15 +17,12 @@
 package org.eclipse.hono.communication.api.service;
 
 
-import io.vertx.codegen.annotations.Nullable;
 import io.vertx.core.Future;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
+import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.mapper.DeviceConfigMapper;
 import org.eclipse.hono.communication.api.repository.DeviceConfigsRepository;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import javax.enterprise.context.ApplicationScoped;
 
@@ -36,7 +33,6 @@
 
 @ApplicationScoped
 public class DeviceConfigServiceImpl implements DeviceConfigService {
-    private final Logger log = LoggerFactory.getLogger(DeviceConfigServiceImpl.class);
 
     private final DeviceConfigsRepository repository;
     private final DatabaseService db;
@@ -51,34 +47,29 @@ public DeviceConfigServiceImpl(DeviceConfigsRepository repository,
         this.mapper = mapper;
     }
 
-    public Future<@Nullable DeviceConfigEntity> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId) {
+    public Future<DeviceConfigResponse> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId) {
 
         var entity = mapper.configRequestToDeviceConfigEntity(deviceConfig);
         entity.setDeviceId(deviceId);
         entity.setTenantId(tenantId);
 
         return db.getDbClient().withTransaction(
-                        sqlConnection -> {
-                            return repository.createOrUpdate(sqlConnection, entity);
-                        })
-                .onSuccess(success -> log.info(success.toString()))
-                .onFailure(error -> log.error(error.getMessage()));
+                        sqlConnection ->
+                                repository.createNew(sqlConnection, entity))
+                .map(mapper::deviceConfigEntityToResponse);
     }
 
     public Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit) {
         return db.getDbClient().withTransaction(
-                        sqlConnection -> {
-                            return repository.listAll(sqlConnection, deviceId, tenantId, limit)
-                                    .map(
-                                            result -> {
-                                                var listConfig = new ListDeviceConfigVersionsResponse();
-                                                listConfig.setDeviceConfigs(result);
-                                                return listConfig;
-                                            }
-                                    );
-                        }
-                )
-                .onSuccess(success -> log.info(success.getDeviceConfigs().toString()))
-                .onFailure(error -> log.error(error.getMessage()));
+                sqlConnection -> repository.listAll(sqlConnection, deviceId, tenantId, limit)
+                        .map(
+                                result -> {
+                                    var listConfig = new ListDeviceConfigVersionsResponse();
+                                    listConfig.setDeviceConfigs(result);
+                                    return listConfig;
+                                }
+                        )
+        );
+
     }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
index 97e7756a..ff9c7208 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
@@ -27,23 +27,23 @@
 public class DatabaseConfig {
 
     // Datasource properties
-    @ConfigProperty(name = "quarkus.datasource.port")
+    @ConfigProperty(name = "vertx.database.port")
     int port;
-    @ConfigProperty(name = "quarkus.datasource.host")
+    @ConfigProperty(name = "vertx.database.host")
     String host;
-    @ConfigProperty(name = "quarkus.datasource.username")
+    @ConfigProperty(name = "vertx.database.username")
     String userName;
-    @ConfigProperty(name = "quarkus.datasource.password")
+    @ConfigProperty(name = "vertx.database.password")
     String password;
-    @ConfigProperty(name = "quarkus.datasource.name")
+    @ConfigProperty(name = "vertx.database.name")
     String name;
-    @ConfigProperty(name = "quarkus.datasource.pool-max-size")
+    @ConfigProperty(name = "vertx.database.pool-max-size")
     int poolMaxSize;
-    @ConfigProperty(name = "quarkus.device-registration.table")
+    @ConfigProperty(name = "vertx.device-registration.table")
     String deviceRegistrationTableName;
-    @ConfigProperty(name = "quarkus.device-registration.tenant-id-column")
+    @ConfigProperty(name = "vertx.device-registration.tenant-id-column")
     String deviceRegistrationTenantIdColumn;
-    @ConfigProperty(name = "quarkus.device-registration.device-id-column")
+    @ConfigProperty(name = "vertx.device-registration.device-id-column")
     String deviceRegistrationDeviceIdColumn;
 
     public String getDeviceRegistrationTableName() {
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
index 54903a13..a7fc4ef2 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
@@ -34,6 +34,28 @@ public class ServerConfig {
     @ConfigProperty(name = "vertx.server.port", defaultValue = "8080")
     int serverPort;
 
+    @ConfigProperty(name = "vertx.server.paths.readiness", defaultValue = "/readiness")
+    String readinessPath;
+
+
+    @ConfigProperty(name = "vertx.server.paths.liveness", defaultValue = "/liveness")
+    String livenessPath;
+
+    @ConfigProperty(name = "vertx.server.paths.base")
+    String basePath;
+
+    public String getBasePath() {
+        return basePath;
+    }
+
+    public String getReadinessPath() {
+        return readinessPath;
+    }
+
+    public String getLivenessPath() {
+        return livenessPath;
+    }
+
     public String getOpenApiFilePath() {
         return openApiFilePath;
     }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
index c3eb514f..072b4dbc 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
@@ -17,24 +17,31 @@
 package org.eclipse.hono.communication.core.utils;
 
 import io.vertx.core.Vertx;
+import io.vertx.core.impl.logging.Logger;
+import io.vertx.core.impl.logging.LoggerFactory;
 import io.vertx.pgclient.PgConnectOptions;
 import io.vertx.pgclient.PgPool;
 import io.vertx.sqlclient.PoolOptions;
-import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
 
 /**
  * Database utilities class
  */
 public class DbUtils {
 
+    final static Logger log = LoggerFactory.getLogger(DbUtils.class);
+    final static String connectionFailedMsg = "Failed to connect to Database: %s";
+    final static String connectionSuccessMsg = "Database connection created successfully.";
+
     /**
      * Build DB client that is used to manage a pool of connections
      *
      * @param vertx Vertx context
      * @return PostgreSQL pool
      */
-    public static PgPool createDbClient(Vertx vertx, ApplicationConfig appConfigs) {
-        var dbConfigs = appConfigs.getDatabaseConfig();
+    public static PgPool createDbClient(Vertx vertx, DatabaseConfig dbConfigs) {
+
+
         final PgConnectOptions connectOptions = new PgConnectOptions()
                 .setHost(dbConfigs.getHost())
                 .setPort(dbConfigs.getPort())
@@ -43,8 +50,18 @@ public static PgPool createDbClient(Vertx vertx, ApplicationConfig appConfigs) {
                 .setPassword(dbConfigs.getPassword());
 
         final PoolOptions poolOptions = new PoolOptions().setMaxSize(dbConfigs.getPoolMaxSize());
+        var pool = PgPool.pool(vertx, connectOptions, poolOptions);
+        pool.getConnection(connection -> {
+            if (connection.failed()) {
+                log.error(String.format(connectionFailedMsg, connection.cause().getMessage()));
+                System.exit(-1);
+
+            } else {
+                log.info(connectionSuccessMsg);
+            }
+        });
+        return pool;
 
-        return PgPool.pool(vertx, connectOptions, poolOptions);
     }
 
 }
diff --git a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
index 5b94daa4..1c44c3ee 100644
--- a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
+++ b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
@@ -4,6 +4,9 @@ info:
   title: Hono Device Communication
   version: 1.0.0
   description: Device commands and configs API.
+servers:
+  - url: http://localhost:8080/api/v1
+
 paths:
   /commands/{tenantid}/{deviceid}:
     summary: Device commands
@@ -40,19 +43,21 @@ paths:
         required: true
   /configs/{tenantid}/{deviceid}:
     summary: Device configs
-    description: Configs for a specific device
+    description: Create or list Configs for a specific device
     get:
       tags:
         - CONFIGS
       parameters:
         - name: numVersions
           description: "The number of versions to list. Versions are listed in decreasing
-          order of the version number. The maximum number of versions retained is
+          order of the version number. The maximum number of versions saved in Database is
           10. If this value is zero, it will return all the versions available."
           schema:
             type: integer
+            minimum: 0
+            maximum: 10
           in: query
-          required: true
+          required: false
       responses:
         "200":
           content:
@@ -84,16 +89,18 @@ paths:
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/DeviceConfig'
+                $ref: '#/components/schemas/DeviceConfigResponse'
           description: Device config updated successfully
         "400":
-          description: Validation error
+          description: Validation error or Bad request
+        "404":
+          description: Not Found
         "500":
-          description: Internal error
+          description: Internal Server error
       operationId: modifyCloudToDeviceConfig
       summary: Modify cloud to device config
-      description: Modifies the configuration for a specific device and Returns the
-        modified configuration version and its metadata.
+      description: Creates an device config version and Returns the
+        the new configuration version and its metadata.
     parameters:
       - name: tenantid
         description: Unique registry id
@@ -134,17 +141,11 @@ components:
     DeviceConfigRequest:
       description: Request body for modifying device configs
       required:
-        - versionToUpdate
         - binaryData
       type: object
       properties:
         versionToUpdate:
-          description: "string (int64 format)\r\n\r\nThe version number to update.
-            If this value is zero, it will not check the version number of the server
-            and will always update the current version; otherwise, this update will
-            fail if the version number found on the server does not match this version
-            number. This is used to support multiple simultaneous updates without
-            losing data."
+          description: "string (int64 format)\r\n\r\nThe Config version number."
           type: string
         binaryData:
           description: "string (bytes format)\r\n\r\nThe configuration data for the
@@ -204,3 +205,30 @@ components:
         cloudUpdateTime: string
         deviceAckTime: string
         binaryData: string
+    DeviceConfigResponse:
+      title: New Config version response
+      description: The device configuration.
+      type: object
+      properties:
+        version:
+          description: "String (int64 format) [Output only] The version
+            of this update. The version number is assigned by the server, and is
+            always greater than 0 after device creation. The version must be 0 on
+            the devices.create request if a config is specified; the response of
+            devices.create will always have a value of 1."
+          type: string
+        cloudUpdateTime:
+          description: "String (Timestamp format) [Output only] The time at
+            which this configuration version was updated in Cloud IoT Core. This
+            timestamp is set by the server. Timestamp in 
+            RFC3339 UTC \"Zulu\" format, accurate to nanoseconds. 
+            Example: \"2014-10-02T15:01:23.045123456Z\"."
+          type: string
+        binaryData:
+          description: "string (bytes format) The device configuration data
+            in string base64-encoded format."
+          type: string
+      example:
+        version: string
+        cloudUpdateTime: string
+        binaryData: string
diff --git a/device-communication/src/main/resources/application.yaml b/device-communication/src/main/resources/application.yaml
index f1618822..fea04fc8 100644
--- a/device-communication/src/main/resources/application.yaml
+++ b/device-communication/src/main/resources/application.yaml
@@ -1,37 +1,36 @@
 app:
   name: "Device Communication"
-  version: "v1"
+  version: ${COM_APP_VERSION:"v1"}
 vertx:
   openapi:
-    file: "/api/hono-device-communication-v1.yaml"
+    file: ${COM_OPENAPI_FILE_PATH:/api/hono-device-communication-v1.yaml}
+
   server:
-    url: "localhost"
-    port: 8081
+    url: ${COM_SERVER_HOST:0.0.0.0}
+    port: ${COM_SERVER_PORT:8080}
+    paths:
+      base: ${COM_SERVER_BASE_PATH:/api/v1/}  # base path should always end with "/"
+      liveness: ${COM_SERVER_LIVENESS_PATH:/alive}
+      readiness: ${COM_SERVER_READINESS_PATH:/ready}
 
-quarkus:
-  flyway:
-    migrate-at-start: true
-  # Device registration table configs. Used for validating devices
-  device-registration:
-    table: "device_registration"
-    tenant-id-column: "tenant_id"
-    device-id-column: "device_id"
-  datasource:
-    pool-max-size: 5
-    name: "hono"
-    host: "localhost"
-    port: 5432
-    username: "postgres"
-    password: "mysecretpassword"
+  database:
+    pool-max-size: ${COM_POOL_MAX_SIZE:5}
+    name: ${COM_DB_NAME:hono}
+    host: ${COM_DB_HOST:localhost}
+    port: ${COM_DB_PORT:5432}
+    username: ${COM_DB_USERNAME:postgres}
+    password: ${COM_DB_PASSWORD:mysecretpassword}
     db-kind: "postgresql"
-    jdbc:
-      url: "jdbc:postgresql://localhost:5432/hono"
 
+  # Device registration table configs. Used for validating devices
+  device-registration:
+    table: ${COM_DB_DEVICE_REG_TABLE:device_registrations}
+    tenant-id-column: ${COM_DB_DEVICE_REG_TENANT_COL_NAME:tenant_id}
+    device-id-column: ${COM_DB_DEVICE_REG_DEVICE_COL_NAME:device_id}
 
-"%dev":
-  app:
-    name: "Device Communication"
-  vertx:
-    server:
-      url: "localhost"
-      port: "8081"
\ No newline at end of file
+quarkus:
+  container-image:
+    builder: docker
+    build: true
+    push: true
+    image: "gcr.io/sotec-iot-core-dev/hono-device-communication"
diff --git a/device-communication/src/main/resources/db/create_device_config_table.sql b/device-communication/src/main/resources/db/create_device_config_table.sql
new file mode 100644
index 00000000..1f11816d
--- /dev/null
+++ b/device-communication/src/main/resources/db/create_device_config_table.sql
@@ -0,0 +1,28 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+
+CREATE TABLE IF NOT EXISTS "deviceConfig"
+(
+    version           INT          not null,
+    "tenantId"        VARCHAR(100) not null,
+    "deviceId"        VARCHAR(100) not null,
+    "cloudUpdateTime" VARCHAR(100) not null,
+    "deviceAckTime"   VARCHAR(100),
+    "binaryData"      VARCHAR      not null,
+
+    PRIMARY KEY (version, "tenantId", "deviceId")
+)
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
index d30d376b..a5a61fa5 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
@@ -23,14 +23,13 @@
 import io.vertx.core.Vertx;
 import io.vertx.core.http.*;
 import io.vertx.core.json.JsonObject;
+import io.vertx.ext.web.Route;
 import io.vertx.ext.web.Router;
 import io.vertx.ext.web.RoutingContext;
 import io.vertx.ext.web.openapi.RouterBuilder;
 import io.vertx.ext.web.validation.BadRequestException;
 import org.eclipse.hono.communication.api.handler.DeviceCommandsHandler;
-import org.eclipse.hono.communication.api.service.DatabaseService;
-import org.eclipse.hono.communication.api.service.DatabaseServiceImpl;
-import org.eclipse.hono.communication.api.service.VertxHttpHandlerManagerService;
+import org.eclipse.hono.communication.api.service.*;
 import org.eclipse.hono.communication.core.app.ApplicationConfig;
 import org.eclipse.hono.communication.core.app.ServerConfig;
 import org.junit.jupiter.api.AfterEach;
@@ -46,7 +45,6 @@
 
 class DeviceCommunicationHttpServerTest {
 
-
     private ApplicationConfig appConfigsMock;
     private VertxHttpHandlerManagerService handlerServiceMock;
     private Vertx vertxMock;
@@ -58,6 +56,8 @@ class DeviceCommunicationHttpServerTest {
     private HttpServerResponse httpServerResponseMock;
     private HttpServerRequest httpServerRequestMock;
     private BadRequestException badRequestExceptionMock;
+    private DatabaseSchemaCreator databaseSchemaCreatorMock;
+    private Route routeMock;
     private JsonObject jsonObjMock;
 
     private DatabaseService dbMock;
@@ -78,7 +78,13 @@ void setUp() {
         badRequestExceptionMock = mock(BadRequestException.class);
         jsonObjMock = mock(JsonObject.class);
         dbMock = mock(DatabaseServiceImpl.class);
-        deviceCommunicationHttpServer = new DeviceCommunicationHttpServer(appConfigsMock, vertxMock, handlerServiceMock, dbMock);
+        databaseSchemaCreatorMock = mock(DatabaseSchemaCreatorImpl.class);
+        routeMock = mock(Route.class);
+        deviceCommunicationHttpServer = new DeviceCommunicationHttpServer(appConfigsMock,
+                vertxMock,
+                handlerServiceMock,
+                dbMock,
+                databaseSchemaCreatorMock);
 
     }
 
@@ -97,7 +103,9 @@ void tearDown() {
                 badRequestExceptionMock,
                 jsonObjMock,
                 dbMock,
-                serverConfigMock);
+                serverConfigMock,
+                databaseSchemaCreatorMock,
+                routeMock);
     }
 
 
@@ -107,40 +115,67 @@ void startSucceeded() {
         Mockito.verifyNoMoreInteractions(mockedCommandService);
         doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
         try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
-            mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
-                    .thenReturn(Future.succeededFuture(routerBuilderMock));
-            mockedRouterBuilderStatic.verifyNoMoreInteractions();
-            when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
-            when(handlerServiceMock.getAvailableHandlerServices()).thenReturn(List.of(mockedCommandService));
-            when(routerBuilderMock.createRouter()).thenReturn(routerMock);
-            when(routerMock.errorHandler(anyInt(), any())).thenReturn(routerMock);
-            when(vertxMock.createHttpServer(any(HttpServerOptions.class))).thenReturn(httpServerMock);
-            when(httpServerMock.requestHandler(routerMock)).thenReturn(httpServerMock);
-            when(httpServerMock.listen()).thenReturn(Future.succeededFuture(httpServerMock));
-            when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
-
-            try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
-
-                this.deviceCommunicationHttpServer.start();
-
-                mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
-
-                verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
-                verify(routerBuilderMock, times(1)).createRouter();
-
-                verify(vertxMock, times(1)).createHttpServer(any(HttpServerOptions.class));
-                verify(httpServerMock, times(1)).requestHandler(routerMock);
-                verify(httpServerMock, times(1)).listen();
-                verify(appConfigsMock, times(2)).getServerConfig();
-                verify(serverConfigMock, times(2)).getServerUrl();
-                verify(serverConfigMock, times(2)).getServerPort();
-                verify(mockedCommandService, times(1)).addRoutes(routerBuilderMock);
-                verify(serverConfigMock, times(1)).getOpenApiFilePath();
-                quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
-                quarkusMockedStatic.verifyNoMoreInteractions();
 
+            try (MockedStatic<Router> routerMockedStatic = mockStatic(Router.class)) {
+
+                routerMockedStatic.when(() -> Router.router(any())).thenReturn(routerMock);
+                mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
+                        .thenReturn(Future.succeededFuture(routerBuilderMock));
+                mockedRouterBuilderStatic.verifyNoMoreInteractions();
+                when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
+                when(handlerServiceMock.getAvailableHandlerServices()).thenReturn(List.of(mockedCommandService));
+                when(routerBuilderMock.createRouter()).thenReturn(routerMock);
+                when(serverConfigMock.getLivenessPath()).thenReturn("/live");
+                when(serverConfigMock.getReadinessPath()).thenReturn("/ready");
+                when(routerMock.get(anyString())).thenReturn(routeMock);
+                when(routeMock.handler(any())).thenReturn(routeMock);
+                when(routerMock.errorHandler(anyInt(), any())).thenReturn(routerMock);
+                when(vertxMock.createHttpServer(any(HttpServerOptions.class))).thenReturn(httpServerMock);
+                when(httpServerMock.requestHandler(any())).thenReturn(httpServerMock);
+                when(httpServerMock.listen()).thenReturn(Future.succeededFuture(httpServerMock));
+                when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
+                when(serverConfigMock.getBasePath()).thenReturn("/basePath");
+                when(routerMock.route(any())).thenReturn(routeMock);
+
+                try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
+
+                    this.deviceCommunicationHttpServer.start();
+
+                    mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
+                    routerMockedStatic.verify(() -> Router.router(vertxMock), times(1));
+
+
+                    verify(databaseSchemaCreatorMock, times(1)).createDBTables();
+                    verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
+                    verify(routerBuilderMock, times(1)).createRouter();
+
+
+                    verify(vertxMock, times(1)).createHttpServer(any(HttpServerOptions.class));
+                    verify(httpServerMock, times(1)).requestHandler(any());
+                    verify(httpServerMock, times(1)).listen();
+                    verify(appConfigsMock, times(3)).getServerConfig();
+                    verify(serverConfigMock, times(2)).getServerUrl();
+                    verify(serverConfigMock, times(2)).getServerPort();
+                    verify(serverConfigMock, times(1)).getLivenessPath();
+                    verify(serverConfigMock, times(1)).getReadinessPath();
+                    verify(serverConfigMock, times(1)).getBasePath();
+                    verify(mockedCommandService, times(1)).addRoutes(routerBuilderMock);
+                    verify(serverConfigMock, times(1)).getOpenApiFilePath();
+                    verify(routerMock, times(1)).errorHandler(eq(400), any());
+                    verify(routerMock, times(1)).errorHandler(eq(404), any());
+                    verify(routerMock, times(2)).get(anyString());
+                    verify(routeMock, times(2)).handler(any());
+                    verify(routerMock, times(1)).route(anyString());
+                    verify(routeMock, times(1)).subRouter(any());
+                    quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
+                    routerMockedStatic.verifyNoMoreInteractions();
+                    mockedRouterBuilderStatic.verifyNoMoreInteractions();
+                    quarkusMockedStatic.verifyNoMoreInteractions();
+
+                }
             }
 
+
         }
 
 
@@ -161,9 +196,13 @@ void createRouterFailed() {
             try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
                 this.deviceCommunicationHttpServer.start();
 
+
+                verify(dbMock, times(1)).close();
+                verify(databaseSchemaCreatorMock, times(1)).createDBTables();
                 verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
                 verify(appConfigsMock, times(1)).getServerConfig();
                 verify(serverConfigMock, times(1)).getOpenApiFilePath();
+                quarkusMockedStatic.verify(() -> Quarkus.asyncExit(-1), times(1));
                 quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
                 quarkusMockedStatic.verifyNoMoreInteractions();
             }
@@ -178,35 +217,57 @@ void createServerFailed() {
         Mockito.verifyNoMoreInteractions(mockedCommandService);
         doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
         try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
-            mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
-                    .thenReturn(Future.succeededFuture(routerBuilderMock));
-            mockedRouterBuilderStatic.verifyNoMoreInteractions();
-            when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
-            when(handlerServiceMock.getAvailableHandlerServices()).thenReturn(List.of());
-            when(routerBuilderMock.createRouter()).thenReturn(routerMock);
-            when(routerMock.errorHandler(anyInt(), any())).thenReturn(routerMock);
-            when(vertxMock.createHttpServer(any(HttpServerOptions.class))).thenReturn(httpServerMock);
-            when(httpServerMock.requestHandler(routerMock)).thenReturn(httpServerMock);
-            when(httpServerMock.listen()).thenReturn(Future.failedFuture(new Throwable()));
-            when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
-
             try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
-
-                this.deviceCommunicationHttpServer.start();
-
-                mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
-
-                verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
-                verify(routerBuilderMock, times(1)).createRouter();
-                verify(vertxMock, times(1)).createHttpServer(any(HttpServerOptions.class));
-                verify(httpServerMock, times(1)).requestHandler(routerMock);
-                verify(httpServerMock, times(1)).listen();
-                verify(appConfigsMock, times(2)).getServerConfig();
-                verify(serverConfigMock, times(1)).getOpenApiFilePath();
-                verify(serverConfigMock, times(1)).getServerPort();
-                verify(serverConfigMock, times(1)).getServerUrl();
-                quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
-                quarkusMockedStatic.verifyNoMoreInteractions();
+                try (MockedStatic<Router> routerMockedStatic = mockStatic(Router.class)) {
+                    mockedRouterBuilderStatic.when(() -> RouterBuilder.create(any(), any()))
+                            .thenReturn(Future.succeededFuture(routerBuilderMock));
+
+                    routerMockedStatic.when(() -> Router.router(any())).thenReturn(routerMock);
+
+                    when(appConfigsMock.getServerConfig()).thenReturn(serverConfigMock);
+                    when(handlerServiceMock.getAvailableHandlerServices()).thenReturn(List.of());
+                    when(routerBuilderMock.createRouter()).thenReturn(routerMock);
+                    when(routerMock.errorHandler(anyInt(), any())).thenReturn(routerMock);
+                    when(serverConfigMock.getLivenessPath()).thenReturn("/live");
+                    when(serverConfigMock.getReadinessPath()).thenReturn("/ready");
+                    when(routerMock.get(anyString())).thenReturn(routeMock);
+                    when(routeMock.handler(any())).thenReturn(routeMock);
+                    when(vertxMock.createHttpServer(any(HttpServerOptions.class))).thenReturn(httpServerMock);
+                    when(httpServerMock.requestHandler(routerMock)).thenReturn(httpServerMock);
+                    when(httpServerMock.listen()).thenReturn(Future.failedFuture(new Throwable()));
+                    when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
+                    when(serverConfigMock.getBasePath()).thenReturn("/basePath");
+                    when(routerMock.route(any())).thenReturn(routeMock);
+
+                    this.deviceCommunicationHttpServer.start();
+
+                    mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
+
+                    verify(databaseSchemaCreatorMock, times(1)).createDBTables();
+                    verify(handlerServiceMock, times(1)).getAvailableHandlerServices();
+                    verify(routerBuilderMock, times(1)).createRouter();
+                    verify(vertxMock, times(1)).createHttpServer(any(HttpServerOptions.class));
+                    verify(httpServerMock, times(1)).requestHandler(routerMock);
+                    verify(httpServerMock, times(1)).listen();
+                    verify(appConfigsMock, times(3)).getServerConfig();
+                    verify(serverConfigMock, times(1)).getOpenApiFilePath();
+                    verify(serverConfigMock, times(1)).getServerPort();
+                    verify(serverConfigMock, times(1)).getServerUrl();
+                    verify(serverConfigMock, times(1)).getLivenessPath();
+                    verify(serverConfigMock, times(1)).getReadinessPath();
+                    verify(serverConfigMock, times(1)).getBasePath();
+                    verify(routerMock, times(1)).errorHandler(eq(400), any());
+                    verify(routerMock, times(1)).errorHandler(eq(404), any());
+                    verify(routerMock, times(2)).get(anyString());
+                    verify(routeMock, times(2)).handler(any());
+                    verify(routeMock, times(1)).subRouter(any());
+                    verify(routerMock, times(1)).route(anyString());
+                    routerMockedStatic.verify(() -> Router.router(vertxMock), times(1));
+                    quarkusMockedStatic.verify(Quarkus::waitForExit, times(1));
+                    mockedRouterBuilderStatic.verifyNoMoreInteractions();
+                    routerMockedStatic.verifyNoMoreInteractions();
+                    quarkusMockedStatic.verifyNoMoreInteractions();
+                }
             }
 
         }
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
index 94d2640f..ad563f8e 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
@@ -26,10 +26,10 @@
 import io.vertx.ext.web.openapi.Operation;
 import io.vertx.ext.web.openapi.RouterBuilder;
 import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
-import org.eclipse.hono.communication.api.entity.DeviceConfig;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.data.DeviceConfig;
+import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
+import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.service.DeviceConfigService;
 import org.eclipse.hono.communication.api.service.DeviceConfigServiceImpl;
 import org.junit.jupiter.api.AfterEach;
@@ -59,7 +59,7 @@ class DeviceConfigsHandlerTest {
     private final String deviceID = "device_ID";
     private final String errorMsg = "test_error";
     DeviceConfigRequest deviceConfigRequest = new DeviceConfigRequest("1", "binary_data");
-    DeviceConfigEntity deviceConfigEntity = new DeviceConfigEntity();
+    DeviceConfigResponse deviceConfigEntity = new DeviceConfigResponse();
     DeviceConfig deviceConfig = new DeviceConfig();
 
     public DeviceConfigsHandlerTest() {
@@ -74,8 +74,7 @@ public DeviceConfigsHandlerTest() {
         deviceConfigsHandler = new DeviceConfigsHandler(configServiceMock);
 
         deviceConfigEntity.setVersion(1);
-        deviceConfigEntity.setTenantId(tenantID);
-        deviceConfigEntity.setDeviceId(deviceID);
+
 
         deviceConfig.setVersion("");
 
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java
new file mode 100644
index 00000000..8b818edc
--- /dev/null
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java
@@ -0,0 +1,91 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
+package org.eclipse.hono.communication.api.service;
+
+import io.vertx.core.Future;
+import io.vertx.core.Vertx;
+import io.vertx.core.file.FileSystem;
+import io.vertx.pgclient.PgPool;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+class DatabaseSchemaCreatorImplTest {
+
+    private final Vertx vertxMock;
+    private final DatabaseService dbMock;
+    private final FileSystem fileSystemMock;
+    private final PgPool pgPoolMock;
+
+    private final DatabaseSchemaCreatorImpl databaseSchemaCreator;
+
+    DatabaseSchemaCreatorImplTest() {
+        this.dbMock = mock(DatabaseService.class);
+        this.vertxMock = mock(Vertx.class);
+        this.fileSystemMock = mock(FileSystem.class);
+        this.pgPoolMock = mock(PgPool.class);
+
+        this.databaseSchemaCreator = new DatabaseSchemaCreatorImpl(vertxMock, dbMock);
+    }
+
+    @BeforeEach
+    void setUp() {
+    }
+
+    @AfterEach
+    void tearDown() {
+        verifyNoMoreInteractions(vertxMock, dbMock, pgPoolMock, fileSystemMock);
+    }
+
+    @Test
+    void createDBTables_success() {
+        when(vertxMock.fileSystem()).thenReturn(fileSystemMock);
+        when(fileSystemMock.readFile(anyString(), any())).thenReturn(fileSystemMock);
+        when(dbMock.getDbClient()).thenReturn(pgPoolMock);
+        when(pgPoolMock.withTransaction(any())).thenReturn(Future.succeededFuture());
+
+        databaseSchemaCreator.createDBTables();
+
+        verify(vertxMock).fileSystem();
+        verify(fileSystemMock).readFile(anyString(), any());
+        verify(dbMock).getDbClient();
+        verify(pgPoolMock).withTransaction(any());
+
+    }
+
+
+    @Test
+    void createDBTables_failed() {
+        when(vertxMock.fileSystem()).thenReturn(fileSystemMock);
+        when(fileSystemMock.readFile(anyString(), any())).thenReturn(fileSystemMock);
+        when(dbMock.getDbClient()).thenReturn(pgPoolMock);
+        when(pgPoolMock.withTransaction(any())).thenReturn(Future.failedFuture(new Throwable()));
+
+        databaseSchemaCreator.createDBTables();
+
+        verify(vertxMock).fileSystem();
+        verify(fileSystemMock).readFile(anyString(), any());
+        verify(dbMock).getDbClient();
+        verify(dbMock).close();
+        verify(pgPoolMock).withTransaction(any());
+
+    }
+}
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
index 8fffb4a0..33025dbd 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
@@ -18,7 +18,7 @@
 
 import io.vertx.core.Vertx;
 import io.vertx.pgclient.PgPool;
-import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
 import org.eclipse.hono.communication.core.utils.DbUtils;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Assertions;
@@ -30,14 +30,14 @@
 class DatabaseServiceImplTest {
 
     private final Vertx vertxMock;
-    private final ApplicationConfig applicationConfigMock;
+    private final DatabaseConfig databaseConfigMock;
 
     private final PgPool pgPoolMock;
     private DatabaseService databaseService;
 
     public DatabaseServiceImplTest() {
         vertxMock = mock(Vertx.class);
-        applicationConfigMock = mock(ApplicationConfig.class);
+        databaseConfigMock = mock(DatabaseConfig.class);
         pgPoolMock = mock(PgPool.class);
 
 
@@ -45,7 +45,7 @@ public DatabaseServiceImplTest() {
 
     @AfterEach
     void tearDown() {
-        verifyNoMoreInteractions(vertxMock, applicationConfigMock, pgPoolMock);
+        verifyNoMoreInteractions(vertxMock, databaseConfigMock, pgPoolMock);
 
     }
 
@@ -53,14 +53,14 @@ void tearDown() {
     @Test
     void getDbClient() {
         try (MockedStatic<DbUtils> dbUtilsMockedStatic = mockStatic(DbUtils.class)) {
-            dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock)).thenReturn(pgPoolMock);
-            databaseService = new DatabaseServiceImpl(applicationConfigMock, vertxMock);
+            dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, databaseConfigMock)).thenReturn(pgPoolMock);
+            databaseService = new DatabaseServiceImpl(databaseConfigMock, vertxMock);
 
             var client = databaseService.getDbClient();
 
             Assertions.assertSame(client, pgPoolMock);
 
-            dbUtilsMockedStatic.verify(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock), times(1));
+            dbUtilsMockedStatic.verify(() -> DbUtils.createDbClient(vertxMock, databaseConfigMock), times(1));
             dbUtilsMockedStatic.verifyNoMoreInteractions();
         }
     }
@@ -69,12 +69,12 @@ void getDbClient() {
     void close() {
 
         try (MockedStatic<DbUtils> dbUtilsMockedStatic = mockStatic(DbUtils.class)) {
-            dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock)).thenReturn(pgPoolMock);
-            databaseService = new DatabaseServiceImpl(applicationConfigMock, vertxMock);
+            dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, databaseConfigMock)).thenReturn(pgPoolMock);
+            databaseService = new DatabaseServiceImpl(databaseConfigMock, vertxMock);
 
             databaseService.close();
             verify(pgPoolMock, times(1)).close();
-            dbUtilsMockedStatic.verify(() -> DbUtils.createDbClient(vertxMock, applicationConfigMock), times(1));
+            dbUtilsMockedStatic.verify(() -> DbUtils.createDbClient(vertxMock, databaseConfigMock), times(1));
             dbUtilsMockedStatic.verifyNoMoreInteractions();
         }
     }
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
index 8ecbf615..b248bb13 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
@@ -18,9 +18,10 @@
 
 import io.vertx.core.Future;
 import io.vertx.pgclient.PgPool;
-import org.eclipse.hono.communication.api.entity.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.entity.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.entity.ListDeviceConfigVersionsResponse;
+import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
+import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
+import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.mapper.DeviceConfigMapper;
 import org.eclipse.hono.communication.api.repository.DeviceConfigsRepository;
 import org.eclipse.hono.communication.api.repository.DeviceConfigsRepositoryImpl;
@@ -45,8 +46,8 @@ public DeviceConfigServiceImplTest() {
         this.repositoryMock = mock(DeviceConfigsRepositoryImpl.class);
         this.dbMock = mock(DatabaseServiceImpl.class);
         this.mapperMock = mock(DeviceConfigMapper.class);
-        poolMock = mock(PgPool.class);
-        deviceConfigService = new DeviceConfigServiceImpl(repositoryMock, dbMock, mapperMock);
+        this.poolMock = mock(PgPool.class);
+        this.deviceConfigService = new DeviceConfigServiceImpl(repositoryMock, dbMock, mapperMock);
     }
 
 
@@ -59,7 +60,9 @@ void tearDown() {
     void modifyCloudToDeviceConfig_success() {
         var deviceConfigRequest = new DeviceConfigRequest();
         var deviceConfigEntity = new DeviceConfigEntity();
+        var deviceConfigEntityResponse = new DeviceConfigResponse();
         when(mapperMock.configRequestToDeviceConfigEntity(deviceConfigRequest)).thenReturn(deviceConfigEntity);
+        when(mapperMock.deviceConfigEntityToResponse(deviceConfigEntity)).thenReturn(deviceConfigEntityResponse);
         when(dbMock.getDbClient()).thenReturn(poolMock);
         when(poolMock.withTransaction(any())).thenReturn(Future.succeededFuture(deviceConfigEntity));
 
@@ -67,6 +70,7 @@ void modifyCloudToDeviceConfig_success() {
         var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
 
         verify(mapperMock, times(1)).configRequestToDeviceConfigEntity(deviceConfigRequest);
+        verify(mapperMock, times(1)).deviceConfigEntityToResponse(deviceConfigEntity);
         verify(dbMock, times(1)).getDbClient();
         verify(poolMock, times(1)).withTransaction(any());
         Assertions.assertTrue(results.succeeded());

From 363c4e2cd747c5d5998db24f49a3d832aea72381 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Wed, 1 Feb 2023 10:56:01 +0100
Subject: [PATCH 03/18] code refactoring and  update readme

---
 device-communication/README.md                |  10 +-
 device-communication/pom.xml                  |  20 --
 .../api/DeviceCommunicationHttpServer.java    |  19 +-
 .../api/config/DeviceConfigsConstants.java    |   6 +-
 .../api/data/DeviceConfigResponse.java        |   6 +-
 .../DeviceNotFoundException.java}             |  22 +-
 .../api/handler/DeviceCommandsHandler.java    |   1 -
 .../api/handler/DeviceConfigsHandler.java     |   8 +-
 .../DeviceConfigsRepositoryImpl.java          |  39 +--
 .../api/service/DeviceCommandServiceImpl.java |   2 +
 .../api/service/DeviceConfigServiceImpl.java  |   2 +-
 .../core/app/AbstractServiceApplication.java  |   1 +
 .../core/utils/ResponseUtils.java             |  14 +-
 .../api/hono-device-communication-v1.yaml     |  12 +-
 .../src/main/resources/api/hono-endpoint.yaml | 233 ++++++++++++++++++
 .../DeviceCommunicationHttpServerTest.java    |  12 +-
 .../api/handler/DeviceConfigsHandlerTest.java |  32 +--
 .../service/DeviceConfigServiceImplTest.java  |   8 +-
 18 files changed, 353 insertions(+), 94 deletions(-)
 rename device-communication/src/main/java/org/eclipse/hono/communication/api/{config/EndpointConstants.java => exception/DeviceNotFoundException.java} (53%)
 create mode 100644 device-communication/src/main/resources/api/hono-endpoint.yaml

diff --git a/device-communication/README.md b/device-communication/README.md
index f036816d..681e5895 100644
--- a/device-communication/README.md
+++ b/device-communication/README.md
@@ -11,7 +11,7 @@ The application is reactive and uses Quarkus Framework for the application and V
 
 ### Hono internal communication
 
-API uses [Googles PubSub](https://cloud.google.com/pubsub/docs/overview?hl=de) service to communicate with the command
+API uses [Google's PubSub](https://cloud.google.com/pubsub/docs/overview?hl=de) service to communicate with the command
 router.
 
 ## API endpoints
@@ -22,11 +22,11 @@ router.
 
 <p>
 
-#### configs/{tenantId}/{deviceId}
+#### configs/{tenantId}/{deviceId}?numVersion=(int 0 - 10)
 
 - GET : list of device config versions
 
-- POST: update or create a device config version
+- POST: create a device config version
 
 For more information please see resources/api/openApi file.
 
@@ -51,11 +51,11 @@ For running the PostgresSQL Database local with docker run:
 
 ``````
 
-docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres
+docker run -p 5432:5432 --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres
 
 ``````
 
-After the container is running, log in to the container and with psql create the database and the tables. Then we have
+After the container is running, log in to the container and with psql create the database. Then we have
 to set the application settings.
 
 Default postgresSQl values:
diff --git a/device-communication/pom.xml b/device-communication/pom.xml
index afa70b5e..470b55f5 100644
--- a/device-communication/pom.xml
+++ b/device-communication/pom.xml
@@ -166,26 +166,6 @@
 
                 </configuration>
             </plugin>
-            <!--            <plugin>-->
-            <!--                <artifactId>maven-failsafe-plugin</artifactId>-->
-            <!--                <version>${surefire-plugin.version}</version>-->
-            <!--                <executions>-->
-            <!--                    <execution>-->
-            <!--                        <goals>-->
-            <!--                            <goal>integration-test</goal>-->
-            <!--                            <goal>verify</goal>-->
-            <!--                        </goals>-->
-            <!--                        <configuration>-->
-            <!--                            <systemPropertyVariables>-->
-            <!--                                <native.image.path>${project.build.directory}/${project.build.finalName}-runner-->
-            <!--                                </native.image.path>-->
-            <!--                                <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>-->
-            <!--                                <maven.home>${maven.home}</maven.home>-->
-            <!--                            </systemPropertyVariables>-->
-            <!--                        </configuration>-->
-            <!--                    </execution>-->
-            <!--                </executions>-->
-            <!--            </plugin>-->
         </plugins>
     </build>
     <profiles>
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index dd631f3f..16dbd644 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -121,11 +121,12 @@ Router createRouterWithEndpoints(RouterBuilder routerBuilder, List<HttpEndpointH
                 ResponseUtils.errorResponse(routingContext, routingContext.failure()));
 
         var serverConfig = appConfigs.getServerConfig();
-        addHealthCheckHandles(apiRouter, serverConfig);
+        addHealthCheckHandlers(apiRouter, serverConfig);
+        var basePath = String.format("%s*", serverConfig.getBasePath()); // absolut path not allowed only /*
 
-        apiRouter.route(
-                String.format("%s*", serverConfig.getBasePath()) // absolut path not allowed only /*
-        ).subRouter(router);
+        log.info("API base path: {}", basePath);
+
+        apiRouter.route(basePath).subRouter(router);
         return apiRouter;
     }
 
@@ -134,12 +135,12 @@ Router createRouterWithEndpoints(RouterBuilder routerBuilder, List<HttpEndpointH
      *
      * @param router Created router object
      */
-    private void addHealthCheckHandles(Router router, ServerConfig serverConfig) {
-        addReadinessHandles(router, serverConfig.getReadinessPath());
-        addLivenessHandles(router, serverConfig.getLivenessPath());
+    private void addHealthCheckHandlers(Router router, ServerConfig serverConfig) {
+        addReadinessHandlers(router, serverConfig.getReadinessPath());
+        addLivenessHandlers(router, serverConfig.getLivenessPath());
     }
 
-    private void addReadinessHandles(Router router, String readinessPath) {
+    private void addReadinessHandlers(Router router, String readinessPath) {
         log.info("Adding readiness path: {}", readinessPath);
         final HealthCheckHandler healthCheckHandler = HealthCheckHandler.create(vertx);
 
@@ -160,7 +161,7 @@ private void addReadinessHandles(Router router, String readinessPath) {
     }
 
 
-    private void addLivenessHandles(Router router, String livenessPath) {
+    private void addLivenessHandlers(Router router, String livenessPath) {
         log.info("Adding liveness path: {}", livenessPath);
         final HealthCheckHandler healthCheckHandler = HealthCheckHandler.create(vertx);
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
index 89f3936f..18bbc869 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
@@ -24,10 +24,10 @@ public class DeviceConfigsConstants {
     // Open api operationIds
     public final static String POST_MODIFY_DEVICE_CONFIG_OP_ID = "modifyCloudToDeviceConfig";
     public final static String LIST_CONFIG_VERSIONS_OP_ID = "listConfigVersions";
-    
+
     //Device Config Repository
-    public final static String TENANT_PATH_PARAMETER = "tenantid";
-    public final static String DEVICE_PATH_PARAMETER = "deviceid";
+    public final static String TENANT_PATH_PARAMS = "tenantid";
+    public final static String DEVICE_PATH_PARAMS = "deviceid";
     public final static String NUM_VERSION_QUERY_PARAMS = "numVersions";
     public final static String CREATE_SQL_SCRIPT_PATH = "db/create_device_config_table.sql";
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
index d17b5902..017fa248 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
@@ -19,7 +19,7 @@
 import java.util.Objects;
 
 /**
- * The device configuration entity object.
+ * The device configuration response class.
  **/
 public class DeviceConfigResponse {
 
@@ -28,7 +28,7 @@ public class DeviceConfigResponse {
     private String cloudUpdateTime;
     private String binaryData;
 
-  
+
     public DeviceConfigResponse() {
     }
 
@@ -60,7 +60,7 @@ public void setBinaryData(String binaryData) {
 
     @Override
     public String toString() {
-        return "DeviceConfigEntity{" +
+        return "DeviceConfigResponse{" +
                 "version=" + version +
                 ", cloudUpdateTime='" + cloudUpdateTime + '\'' +
                 ", binaryData='" + binaryData + '\'' +
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java
similarity index 53%
rename from device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java
rename to device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java
index 15d04f4c..af805085 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/EndpointConstants.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java
@@ -14,12 +14,26 @@
  *
  */
 
-package org.eclipse.hono.communication.api.config;
+package org.eclipse.hono.communication.api.exception;
+
+import java.util.NoSuchElementException;
 
 /**
- * Class for sharing api constant values
+ * Device Not found exception code: 404
  */
-public class EndpointConstants {
+public class DeviceNotFoundException extends NoSuchElementException {
+    public DeviceNotFoundException() {
+    }
+
+    public DeviceNotFoundException(String s, Throwable cause) {
+        super(s, cause);
+    }
+
+    public DeviceNotFoundException(Throwable cause) {
+        super(cause);
+    }
 
-    // Device
+    public DeviceNotFoundException(String s) {
+        super(s);
+    }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
index ef6e1f44..f27b6afc 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
@@ -44,6 +44,5 @@ public void addRoutes(RouterBuilder routerBuilder) {
 
     public void handlePostCommand(RoutingContext routingContext) {
         commandService.postCommand(routingContext);
-        // publish command and send response
     }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
index c706f68a..26ab7620 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
@@ -51,8 +51,8 @@ public void addRoutes(RouterBuilder routerBuilder) {
     }
 
     public Future<DeviceConfigResponse> handleModifyCloudToDeviceConfig(RoutingContext routingContext) {
-        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
-        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
+        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
 
         final DeviceConfigRequest deviceConfig = routingContext.body()
                 .asJsonObject()
@@ -67,8 +67,8 @@ public Future<ListDeviceConfigVersionsResponse> handleListConfigVersions(Routing
         var numVersions = routingContext.queryParams().get(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS);
 
         var limit = numVersions == null ? 0 : Integer.parseInt(numVersions);
-        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
-        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
+        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
 
         return configService.listAll(deviceId, tenantId, limit)
                 .onSuccess(result -> ResponseUtils.successResponse(routingContext, result))
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
index 24d9e960..b3ec4e7c 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
@@ -25,6 +25,7 @@
 import io.vertx.sqlclient.templates.SqlTemplate;
 import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.exception.DeviceNotFoundException;
 import org.eclipse.hono.communication.core.app.DatabaseConfig;
 import org.graalvm.collections.Pair;
 
@@ -97,20 +98,28 @@ private Future<Pair<Integer, Integer>> findMaxVersionAndTotalEntries(SqlConnecti
      */
     public Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit) {
         int queryLimit = limit == 0 ? MAX_LIMIT : limit;
-
-        return SqlTemplate
-                .forQuery(sqlConnection, SQL_LIST)
-                .mapTo(DeviceConfig.class)
-                .execute(Map.of("deviceId", deviceId, "tenantId", tenantId, "limit", queryLimit))
-                .map(rowSet -> {
-                    final List<DeviceConfig> configs = new ArrayList<>();
-                    rowSet.forEach(configs::add);
-                    return configs;
-                })
-                .onSuccess(success -> log.info(
-                        String.format("Listing all configs for device %s and tenant %s",
-                                deviceId, tenantId)))
-                .onFailure(throwable -> log.error("Error: {}", throwable));
+        return searchForDevice(sqlConnection, deviceId, tenantId)
+                .compose(
+                        counter -> {
+                            if (counter < 1) {
+                                throw new DeviceNotFoundException(String.format("Device with id %s and tenant id %s doesn't exist",
+                                        deviceId,
+                                        tenantId));
+                            }
+                            return SqlTemplate
+                                    .forQuery(sqlConnection, SQL_LIST)
+                                    .mapTo(DeviceConfig.class)
+                                    .execute(Map.of("deviceId", deviceId, "tenantId", tenantId, "limit", queryLimit))
+                                    .map(rowSet -> {
+                                        final List<DeviceConfig> configs = new ArrayList<>();
+                                        rowSet.forEach(configs::add);
+                                        return configs;
+                                    })
+                                    .onSuccess(success -> log.info(
+                                            String.format("Listing all configs for device %s and tenant %s",
+                                                    deviceId, tenantId)))
+                                    .onFailure(throwable -> log.error("Error: {}", throwable));
+                        });
     }
 
 
@@ -176,7 +185,7 @@ public Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceC
                 .compose(
                         counter -> {
                             if (counter < 1) {
-                                throw new IllegalStateException(String.format("Device with id %s and tenant id %s doesn't exist",
+                                throw new DeviceNotFoundException(String.format("Device with id %s and tenant id %s doesn't exist",
                                         entity.getDeviceId(),
                                         entity.getTenantId()));
                             }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
index 23f939fe..f3d40fdd 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
@@ -36,6 +36,8 @@ public class DeviceCommandServiceImpl implements DeviceCommandService {
      * @param routingContext The routing context
      */
     public void postCommand(RoutingContext routingContext) {
+        // TODO publish command and send response
         log.info("postCommand received");
+        routingContext.response().setStatusCode(501).end();
     }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
index 2374c51f..f2d33012 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
@@ -60,7 +60,7 @@ public Future<DeviceConfigResponse> modifyCloudToDeviceConfig(DeviceConfigReques
     }
 
     public Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit) {
-        return db.getDbClient().withTransaction(
+        return db.getDbClient().withConnection(
                 sqlConnection -> repository.listAll(sqlConnection, deviceId, tenantId, limit)
                         .map(
                                 result -> {
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
index dd894ea0..23a8d33e 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
@@ -93,6 +93,7 @@ private void registerVertxCloseHook() {
                                 element.getLineNumber()))
                         .collect(Collectors.joining(System.lineSeparator()));
                 log.warn("managed vert.x instance has been closed unexpectedly{}{}", System.lineSeparator(), s);
+                this.doStop();
                 completion.complete();
             };
             vertxInternal.addCloseHook(closeHook);
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
index 2af8a2a8..a37b6b18 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
@@ -20,8 +20,7 @@
 import io.vertx.core.json.JsonObject;
 import io.vertx.ext.web.RoutingContext;
 import io.vertx.ext.web.validation.BadRequestException;
-
-import java.util.NoSuchElementException;
+import org.eclipse.hono.communication.api.exception.DeviceNotFoundException;
 
 /**
  * HTTP Response utilities class
@@ -80,18 +79,23 @@ public static void errorResponse(RoutingContext rc, Throwable error) {
                 || error instanceof IllegalStateException
                 || error instanceof NullPointerException
                 || error instanceof BadRequestException) {
-            
+
             // Bad Request
             status = 400;
             message = error.getMessage();
-        } else if (error instanceof NoSuchElementException) {
+        } else if (error instanceof DeviceNotFoundException) {
             // Not Found
             status = 404;
             message = error.getMessage();
         } else {
             // Internal Server Error
             status = 500;
-            message = "Internal Server Error";
+            if (error != null) {
+                message = String.format("Internal Server Error: %s", error.getMessage());
+            } else {
+                message = "Internal Server Error";
+            }
+
         }
 
         rc.response()
diff --git a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
index 1c44c3ee..20aa6466 100644
--- a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
+++ b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
@@ -25,7 +25,11 @@ paths:
         "200":
           description: Command was sent successfully
         "400":
-          description: Command can not be send to device
+          description: Command Validation error or Bad request
+        "404":
+          description: Device not found
+        "500":
+          description: Internal server error
       operationId: postCommand
       summary: Send a command to device.
     parameters:
@@ -65,6 +69,10 @@ paths:
               schema:
                 $ref: '#/components/schemas/ListDeviceConfigVersionsResponse'
           description: Lists the device config versions
+        "404":
+          description: Device not found
+        "500":
+          description: Internal server error
       operationId: listConfigVersions
       summary: List a device config versions
       description: "Lists the last few versions of the device configuration in descending
@@ -94,7 +102,7 @@ paths:
         "400":
           description: Validation error or Bad request
         "404":
-          description: Not Found
+          description: Device not found
         "500":
           description: Internal Server error
       operationId: modifyCloudToDeviceConfig
diff --git a/device-communication/src/main/resources/api/hono-endpoint.yaml b/device-communication/src/main/resources/api/hono-endpoint.yaml
new file mode 100644
index 00000000..e8c29a34
--- /dev/null
+++ b/device-communication/src/main/resources/api/hono-endpoint.yaml
@@ -0,0 +1,233 @@
+swagger: "2.0"
+x-components: { }
+host: "hono-device-communication-gce.endpoints.sotec-iot-core-dev.cloud.goog"
+info:
+  description: Device commands and configs API.
+  title: Hono Device Communication API
+  version: 1.0.0
+schemes:
+  - http
+basePath: /api/v1
+definitions:
+  DeviceCommandRequest:
+    description: Command json object structure
+    example:
+      binaryData: A base64-encoded string
+      subfolder: Optional subfolder for the command
+    properties:
+      binaryData:
+        description: "The command data to send to the device in base64-encoded string format.\r\n\r\n"
+        type: string
+      subfolder:
+        description: >-
+          Optional subfolder for the command. If empty, the command will be
+          delivered to the /devices/{device-id}/commands topic, otherwise it
+          will be delivered to the /devices/{device-id}/commands/{subfolder}
+          topic. Multi-level subfolders are allowed. This field must not have
+          more than 256 characters, and must not contain any MQTT wildcards 
+          ("+" or "#") or null characters.
+        type: string
+    required:
+      - binaryData
+    title: Root Type for Command
+    type: object
+  DeviceConfig:
+    description: The device configuration.
+    example:
+      binaryData: string
+      cloudUpdateTime: string
+      deviceAckTime: string
+      version: string
+    properties:
+      binaryData:
+        description: >-
+          string (bytes format) The device configuration data in string
+          base64-encoded format.
+        type: string
+      cloudUpdateTime:
+        description: >-
+          String (Timestamp format) [Output only] The time at which this
+          configuration version was updated in Cloud IoT Core. This timestamp is
+          set by the server. Timestamp in  RFC3339 UTC "Zulu" format, accurate
+          to nanoseconds.  Example: "2014-10-02T15:01:23.045123456Z".
+        type: string
+      deviceAckTime:
+        description: >-
+          string (Timestamp format) [Output only] The time at which Cloud IoT
+          Core received the acknowledgment from the device, indicating that the
+          device has received this configuration version. If this field is not
+          present, the device has not yet acknowledged that it received this
+          version. Note that when the config was sent to the device, many config
+          versions may have been available in Cloud IoT Core while the device
+          was disconnected, and on connection, only the latest version is sent
+          to the device. Some versions may never be sent to the device, and
+          therefore are never acknowledged. This timestamp is set by Cloud IoT
+          Core. Timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds.
+          Example: "2014-10-02T15:01:23.045123456Z".
+        type: string
+      version:
+        description: >-
+          String (int64 format) [Output only] The version of this update. The
+          version number is assigned by the server, and is always greater than 0
+          after device creation. The version must be 0 on the devices.create
+          request if a config is specified; the response of devices.create will
+          always have a value of 1.
+        type: string
+    title: Root Type for DeviceConfigResponse
+    type: object
+  DeviceConfigRequest:
+    description: Request body for modifying device configs
+    properties:
+      binaryData:
+        description: "string (bytes format) The configuration data for the device in string base64-encoded format.\r\n"
+        type: string
+      versionToUpdate:
+        description: "string (int64 format) The Config version number."
+        type: string
+    required:
+      - binaryData
+    type: object
+  DeviceConfigResponse:
+    description: The device configuration.
+    example:
+      binaryData: string
+      cloudUpdateTime: string
+      version: string
+    properties:
+      binaryData:
+        description: >-
+          string (bytes format) The device configuration data in string
+          base64-encoded format.
+        type: string
+      cloudUpdateTime:
+        description: >-
+          String (Timestamp format) [Output only] The time at which this
+          configuration version was updated in Cloud IoT Core. This timestamp is
+          set by the server. Timestamp in  RFC3339 UTC "Zulu" format, accurate
+          to nanoseconds.  Example: "2014-10-02T15:01:23.045123456Z".
+        type: string
+      version:
+        description: >-
+          String (int64 format) [Output only] The version of this update. The
+          version number is assigned by the server, and is always greater than 0
+          after device creation. The version must be 0 on the devices.create
+          request if a config is specified; the response of devices.create will
+          always have a value of 1.
+        type: string
+    title: New Config version response
+    type: object
+  ListDeviceConfigVersionsResponse:
+    description: A list of a device config versions
+    example:
+      deviceConfigs:
+        - object: DeviceConfigResponse
+    properties:
+      deviceConfigs:
+        description: List of DeviceConfig objects
+        items:
+          $ref: "#/definitions/DeviceConfig"
+        type: array
+    title: Root Type for ListDeviceConfigVersionsResponse
+    type: object
+paths:
+  "/commands/{tenantid}/{deviceid}":
+    parameters:
+      - description: Unique registry ID
+        in: path
+        name: tenantid
+        required: true
+        type: string
+      - description: Unique device ID
+        in: path
+        name: deviceid
+        required: true
+        type: string
+    post:
+      consumes:
+        - application/json
+      operationId: postCommand
+      parameters:
+        - description: CommandRequest object as JSON
+          in: body
+          name: body
+          required: true
+          schema:
+            $ref: "#/definitions/DeviceCommandRequest"
+      responses:
+        "200":
+          description: Command was sent successfully
+        "400":
+          description: Command can not be send to device
+      summary: Send a command to device.
+      tags:
+        - COMMANDS
+
+  "/configs/{tenantid}/{deviceid}":
+    get:
+      description: >-
+        Lists the last few versions of the device configuration in descending
+        order (i.e.: newest first).
+      operationId: listConfigVersions
+      parameters:
+        - description: >-
+            The number of versions to list. Versions are listed in decreasing
+            order of the version number. The maximum number of versions saved in
+            Database is 10. If this value is zero, it will return all the
+            versions available.
+          in: query
+          maximum: 10
+          minimum: 0
+          name: numVersions
+          required: false
+          type: integer
+      produces:
+        - application/json
+      responses:
+        "200":
+          description: Lists the device config versions
+          schema:
+            $ref: "#/definitions/ListDeviceConfigVersionsResponse"
+      summary: List a device config versions
+      tags:
+        - CONFIGS
+    parameters:
+      - description: Unique registry id
+        in: path
+        name: tenantid
+        required: true
+        type: string
+      - description: Unique device id
+        in: path
+        name: deviceid
+        required: true
+        type: string
+    post:
+      consumes:
+        - application/json
+      description: >-
+        Creates an device config version and Returns the the new configuration
+        version and its metadata.
+      operationId: modifyCloudToDeviceConfig
+      parameters:
+        - description: DeviceConfigRequest object as JSON
+          in: body
+          name: body
+          required: true
+          schema:
+            $ref: "#/definitions/DeviceConfigRequest"
+      produces:
+        - application/json
+      responses:
+        "200":
+          description: Device config updated successfully
+          schema:
+            $ref: "#/definitions/DeviceConfigResponse"
+        "400":
+          description: Validation error or Bad request
+        "404":
+          description: Not Found
+        "500":
+          description: Internal Server error
+      summary: Modify cloud to device config
+      tags:
+        - CONFIGS
\ No newline at end of file
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
index a5a61fa5..b7ddf227 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
@@ -138,9 +138,12 @@ void startSucceeded() {
                 when(routerMock.route(any())).thenReturn(routeMock);
 
                 try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
+                    DeviceCommunicationHttpServer deviceCommunicationHttpServerSpy = spy(this.deviceCommunicationHttpServer);
+                    deviceCommunicationHttpServerSpy.start();
 
-                    this.deviceCommunicationHttpServer.start();
 
+                    verify(deviceCommunicationHttpServerSpy, times(1)).createRouterWithEndpoints(eq(routerBuilderMock), any());
+                    verify(deviceCommunicationHttpServerSpy, times(1)).startVertxServer(any());
                     mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
                     routerMockedStatic.verify(() -> Router.router(vertxMock), times(1));
 
@@ -238,8 +241,13 @@ void createServerFailed() {
                     when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
                     when(serverConfigMock.getBasePath()).thenReturn("/basePath");
                     when(routerMock.route(any())).thenReturn(routeMock);
+                    DeviceCommunicationHttpServer deviceCommunicationHttpServerSpy = spy(this.deviceCommunicationHttpServer);
+                    deviceCommunicationHttpServerSpy.start();
 
-                    this.deviceCommunicationHttpServer.start();
+
+                    verify(deviceCommunicationHttpServerSpy, times(1)).createRouterWithEndpoints(eq(routerBuilderMock), any());
+                    verify(deviceCommunicationHttpServerSpy, times(1)).startVertxServer(any());
+                   
 
                     mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
 
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
index ad563f8e..081a71f1 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
@@ -112,8 +112,8 @@ void addRoutes() {
 
     @Test
     void handleModifyCloudToDeviceConfig_success() {
-        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
-        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS)).thenReturn(deviceID);
         when(routingContextMock.body()).thenReturn(requestBodyMock);
         when(requestBodyMock.asJsonObject()).thenReturn(jsonObjMock);
         when(jsonObjMock.mapTo(DeviceConfigRequest.class)).thenReturn(deviceConfigRequest);
@@ -126,8 +126,8 @@ void handleModifyCloudToDeviceConfig_success() {
         var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
 
         verify(configServiceMock).modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID);
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
         verify(routingContextMock, times(1)).body();
         verify(requestBodyMock, times(1)).asJsonObject();
         verify(jsonObjMock, times(1)).mapTo(DeviceConfigRequest.class);
@@ -138,8 +138,8 @@ void handleModifyCloudToDeviceConfig_success() {
 
     @Test
     void handleModifyCloudToDeviceConfig_failure() {
-        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
-        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS)).thenReturn(deviceID);
         when(routingContextMock.body()).thenReturn(requestBodyMock);
         when(requestBodyMock.asJsonObject()).thenReturn(jsonObjMock);
         when(jsonObjMock.mapTo(DeviceConfigRequest.class)).thenReturn(deviceConfigRequest);
@@ -153,9 +153,9 @@ void handleModifyCloudToDeviceConfig_failure() {
         var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
 
         verify(configServiceMock).modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID);
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
 
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
         verify(routingContextMock, times(1)).body();
         verify(requestBodyMock, times(1)).asJsonObject();
         verify(jsonObjMock, times(1)).mapTo(DeviceConfigRequest.class);
@@ -170,8 +170,8 @@ void handleListConfigVersions_success() {
         ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = new ListDeviceConfigVersionsResponse(List.of(deviceConfig));
         MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
         when(routingContextMock.queryParams()).thenReturn(queryParams);
-        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
-        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS)).thenReturn(deviceID);
         when(routingContextMock.response()).thenReturn(httpServerResponseMock);
         when(httpServerResponseMock.setStatusCode(anyInt())).thenReturn(httpServerResponseMock);
         when(httpServerResponseMock.putHeader("Content-Type",
@@ -182,8 +182,8 @@ void handleListConfigVersions_success() {
 
         verify(configServiceMock, times(1)).listAll(deviceID, tenantID, 10);
         verify(routingContextMock, times(1)).queryParams();
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
 
         verifySuccessResponse(results, listDeviceConfigVersionsResponse);
 
@@ -194,8 +194,8 @@ void handleListConfigVersions_success() {
     void handleListConfigVersions_failed() {
         MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
         when(routingContextMock.queryParams()).thenReturn(queryParams);
-        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER)).thenReturn(tenantID);
-        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER)).thenReturn(deviceID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS)).thenReturn(tenantID);
+        when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS)).thenReturn(deviceID);
         when(routingContextMock.response()).thenReturn(httpServerResponseMock);
         when(httpServerResponseMock.setStatusCode(anyInt())).thenReturn(httpServerResponseMock);
         when(illegalArgumentExceptionMock.getMessage()).thenReturn(errorMsg);
@@ -207,9 +207,9 @@ void handleListConfigVersions_failed() {
 
         verify(configServiceMock, times(1)).listAll(deviceID, tenantID, 10);
         verify(routingContextMock, times(1)).queryParams();
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
 
-        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMETER);
+        verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
         verifyErrorResponse(results);
 
 
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
index b248bb13..a8099eb3 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
@@ -97,12 +97,12 @@ void modifyCloudToDeviceConfig_failure() {
     void listAll_success() {
         var deviceConfigVersions = new ListDeviceConfigVersionsResponse();
         when(dbMock.getDbClient()).thenReturn(poolMock);
-        when(poolMock.withTransaction(any())).thenReturn(Future.succeededFuture(deviceConfigVersions));
+        when(poolMock.withConnection(any())).thenReturn(Future.succeededFuture(deviceConfigVersions));
 
         var results = deviceConfigService.listAll(deviceId, tenantId, 10);
 
         verify(dbMock, times(1)).getDbClient();
-        verify(poolMock, times(1)).withTransaction(any());
+        verify(poolMock, times(1)).withConnection(any());
         Assertions.assertTrue(results.succeeded());
 
 
@@ -112,12 +112,12 @@ void listAll_success() {
     @Test
     void listAll_failed() {
         when(dbMock.getDbClient()).thenReturn(poolMock);
-        when(poolMock.withTransaction(any())).thenReturn(Future.failedFuture(new Throwable("test_error")));
+        when(poolMock.withConnection(any())).thenReturn(Future.failedFuture(new Throwable("test_error")));
 
         var results = deviceConfigService.listAll(deviceId, tenantId, 10);
 
         verify(dbMock, times(1)).getDbClient();
-        verify(poolMock, times(1)).withTransaction(any());
+        verify(poolMock, times(1)).withConnection(any());
         Assertions.assertTrue(results.failed());
 
 

From 85989cd4dd301a0bf634b840e9c9f7fc3e19798c Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Thu, 23 Feb 2023 10:25:34 +0100
Subject: [PATCH 04/18] remove entity package

---
 .../api/entity/DeviceCommandRequest.java      |  83 -----------
 .../api/entity/DeviceConfig.java              | 129 -----------------
 .../api/entity/DeviceConfigEntity.java        | 136 ------------------
 .../api/entity/DeviceConfigRequest.java       |  83 -----------
 .../ListDeviceConfigVersionsResponse.java     |  73 ----------
 5 files changed, 504 deletions(-)
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java
deleted file mode 100644
index 23b12f65..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceCommandRequest.java
+++ /dev/null
@@ -1,83 +0,0 @@
-package org.eclipse.hono.communication.api.entity;
-
-import java.util.Objects;
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-/**
- * Command json object structure
- **/
-@JsonInclude(JsonInclude.Include.NON_NULL)
-public class DeviceCommandRequest   {
-  
-  private String binaryData;
-  private String subfolder;
-
-  public DeviceCommandRequest () {
-
-  }
-
-  public DeviceCommandRequest (String binaryData, String subfolder) {
-    this.binaryData = binaryData;
-    this.subfolder = subfolder;
-  }
-
-    
-  @JsonProperty("binaryData")
-  public String getBinaryData() {
-    return binaryData;
-  }
-  public void setBinaryData(String binaryData) {
-    this.binaryData = binaryData;
-  }
-
-    
-  @JsonProperty("subfolder")
-  public String getSubfolder() {
-    return subfolder;
-  }
-  public void setSubfolder(String subfolder) {
-    this.subfolder = subfolder;
-  }
-
-
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
-    if (o == null || getClass() != o.getClass()) {
-      return false;
-    }
-    DeviceCommandRequest deviceCommandRequest = (DeviceCommandRequest) o;
-    return Objects.equals(binaryData, deviceCommandRequest.binaryData) &&
-        Objects.equals(subfolder, deviceCommandRequest.subfolder);
-  }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(binaryData, subfolder);
-  }
-
-  @Override
-  public String toString() {
-    StringBuilder sb = new StringBuilder();
-    sb.append("class DeviceCommandRequest {\n");
-    
-    sb.append("    binaryData: ").append(toIndentedString(binaryData)).append("\n");
-    sb.append("    subfolder: ").append(toIndentedString(subfolder)).append("\n");
-    sb.append("}");
-    return sb.toString();
-  }
-
-  /**
-   * Convert the given object to string with each line indented by 4 spaces
-   * (except the first line).
-   */
-  private String toIndentedString(Object o) {
-    if (o == null) {
-      return "null";
-    }
-    return o.toString().replace("\n", "\n    ");
-  }
-}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java
deleted file mode 100644
index fa2590af..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfig.java
+++ /dev/null
@@ -1,129 +0,0 @@
-/*
- * ***********************************************************
- *  Copyright (c) 2023 Contributors to the Eclipse Foundation
- *  <p>
- *  See the NOTICE file(s) distributed with this work for additional
- *  information regarding copyright ownership.
- *  <p>
- *  This program and the accompanying materials are made available under the
- *  terms of the Eclipse Public License 2.0 which is available at
- *  http://www.eclipse.org/legal/epl-2.0
- *  <p>
- *  SPDX-License-Identifier: EPL-2.0
- * **********************************************************
- *
- */
-
-package org.eclipse.hono.communication.api.entity;
-
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-import java.util.Objects;
-
-/**
- * The device configuration.
- **/
-@JsonInclude(JsonInclude.Include.NON_NULL)
-public class DeviceConfig {
-
-    private String version;
-    private String cloudUpdateTime;
-    private String deviceAckTime;
-    private String binaryData;
-
-    public DeviceConfig() {
-
-    }
-
-    public DeviceConfig(String version, String cloudUpdateTime, String deviceAckTime, String binaryData) {
-        this.version = version;
-        this.cloudUpdateTime = cloudUpdateTime;
-        this.deviceAckTime = deviceAckTime;
-        this.binaryData = binaryData;
-    }
-
-
-    @JsonProperty("version")
-    public String getVersion() {
-        return version;
-    }
-
-    public void setVersion(String version) {
-        this.version = version;
-    }
-
-
-    @JsonProperty("cloudUpdateTime")
-    public String getCloudUpdateTime() {
-        return cloudUpdateTime;
-    }
-
-    public void setCloudUpdateTime(String cloudUpdateTime) {
-        this.cloudUpdateTime = cloudUpdateTime;
-    }
-
-
-    @JsonProperty("deviceAckTime")
-    public String getDeviceAckTime() {
-        return deviceAckTime;
-    }
-
-    public void setDeviceAckTime(String deviceAckTime) {
-        this.deviceAckTime = deviceAckTime;
-    }
-
-
-    @JsonProperty("binaryData")
-    public String getBinaryData() {
-        return binaryData;
-    }
-
-    public void setBinaryData(String binaryData) {
-        this.binaryData = binaryData;
-    }
-
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (o == null || getClass() != o.getClass()) {
-            return false;
-        }
-        DeviceConfig deviceConfig = (DeviceConfig) o;
-        return Objects.equals(version, deviceConfig.version) &&
-                Objects.equals(cloudUpdateTime, deviceConfig.cloudUpdateTime) &&
-                Objects.equals(deviceAckTime, deviceConfig.deviceAckTime) &&
-                Objects.equals(binaryData, deviceConfig.binaryData);
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(version, cloudUpdateTime, deviceAckTime, binaryData);
-    }
-
-    @Override
-    public String toString() {
-
-        String sb = "class DeviceConfig {\n" +
-                "    version: " + toIndentedString(version) + "\n" +
-                "    cloudUpdateTime: " + toIndentedString(cloudUpdateTime) + "\n" +
-                "    deviceAckTime: " + toIndentedString(deviceAckTime) + "\n" +
-                "    binaryData: " + toIndentedString(binaryData) + "\n" +
-                "}";
-        return sb;
-    }
-
-    /**
-     * Convert the given object to string with each line indented by 4 spaces
-     * (except the first line).
-     */
-    private String toIndentedString(Object o) {
-        if (o == null) {
-            return "null";
-        }
-        return o.toString().replace("\n", "\n    ");
-    }
-}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java
deleted file mode 100644
index 3008d5e7..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigEntity.java
+++ /dev/null
@@ -1,136 +0,0 @@
-/*
- * ***********************************************************
- *  Copyright (c) 2023 Contributors to the Eclipse Foundation
- *  <p>
- *  See the NOTICE file(s) distributed with this work for additional
- *  information regarding copyright ownership.
- *  <p>
- *  This program and the accompanying materials are made available under the
- *  terms of the Eclipse Public License 2.0 which is available at
- *  http://www.eclipse.org/legal/epl-2.0
- *  <p>
- *  SPDX-License-Identifier: EPL-2.0
- * **********************************************************
- *
- */
-
-package org.eclipse.hono.communication.api.entity;
-
-import java.util.Objects;
-
-/**
- * The device configuration entity object.
- **/
-public class DeviceConfigEntity {
-
-
-    private int version;
-    private String tenantId;
-    private String deviceId;
-
-    private String cloudUpdateTime;
-    private String deviceAckTime;
-    private String binaryData;
-
-    public DeviceConfigEntity(int version,
-                              String tenantId,
-                              String deviceId,
-                              String cloudUpdateTime,
-                              String deviceAckTime,
-                              String binaryData) {
-        this.version = version;
-        this.tenantId = tenantId;
-        this.deviceId = deviceId;
-        this.cloudUpdateTime = cloudUpdateTime;
-        this.deviceAckTime = deviceAckTime;
-        this.binaryData = binaryData;
-    }
-
-    public DeviceConfigEntity(String tenantId, String deviceId, DeviceConfig deviceConfig) {
-        this.version = Integer.parseInt(deviceConfig.getVersion());
-        this.cloudUpdateTime = deviceConfig.getCloudUpdateTime();
-        this.deviceAckTime = deviceConfig.getDeviceAckTime();
-        this.binaryData = deviceConfig.getBinaryData();
-    }
-
-    public DeviceConfigEntity() {
-    }
-
-
-    public int getVersion() {
-        return version;
-    }
-
-    public void setVersion(int version) {
-        this.version = version;
-    }
-
-    public String getTenantId() {
-        return tenantId;
-    }
-
-    public void setTenantId(String tenantId) {
-        this.tenantId = tenantId;
-    }
-
-    public String getDeviceId() {
-        return deviceId;
-    }
-
-    public void setDeviceId(String deviceId) {
-        this.deviceId = deviceId;
-    }
-
-
-    public String getCloudUpdateTime() {
-        return cloudUpdateTime;
-    }
-
-    public void setCloudUpdateTime(String cloudUpdateTime) {
-        this.cloudUpdateTime = cloudUpdateTime;
-    }
-
-    public String getDeviceAckTime() {
-        return deviceAckTime;
-    }
-
-    public void setDeviceAckTime(String deviceAckTime) {
-        this.deviceAckTime = deviceAckTime;
-    }
-
-    public String getBinaryData() {
-        return binaryData;
-    }
-
-    public void setBinaryData(String binaryData) {
-        this.binaryData = binaryData;
-    }
-
-
-    @Override
-    public String toString() {
-        return "DeviceConfigEntity{" +
-                "version=" + version +
-                ", tenantId='" + tenantId + '\'' +
-                ", deviceId='" + deviceId + '\'' +
-                ", cloudUpdateTime='" + cloudUpdateTime + '\'' +
-                ", deviceAckTime='" + deviceAckTime + '\'' +
-                ", binaryData='" + binaryData + '\'' +
-                '}';
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        DeviceConfigEntity that = (DeviceConfigEntity) o;
-        return version == that.version && tenantId.equals(that.tenantId) && deviceId.equals(that.deviceId) && cloudUpdateTime.equals(that.cloudUpdateTime) && Objects.equals(deviceAckTime, that.deviceAckTime) && binaryData.equals(that.binaryData);
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(version, tenantId, deviceId, cloudUpdateTime, deviceAckTime, binaryData);
-    }
-
-
-}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java
deleted file mode 100644
index c1913b0d..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/DeviceConfigRequest.java
+++ /dev/null
@@ -1,83 +0,0 @@
-package org.eclipse.hono.communication.api.entity;
-
-import java.util.Objects;
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-/**
- * Request body for modifying device configs
- **/
-@JsonInclude(JsonInclude.Include.NON_NULL)
-public class DeviceConfigRequest   {
-  
-  private String versionToUpdate;
-  private String binaryData;
-
-  public DeviceConfigRequest () {
-
-  }
-
-  public DeviceConfigRequest (String versionToUpdate, String binaryData) {
-    this.versionToUpdate = versionToUpdate;
-    this.binaryData = binaryData;
-  }
-
-    
-  @JsonProperty("versionToUpdate")
-  public String getVersionToUpdate() {
-    return versionToUpdate;
-  }
-  public void setVersionToUpdate(String versionToUpdate) {
-    this.versionToUpdate = versionToUpdate;
-  }
-
-    
-  @JsonProperty("binaryData")
-  public String getBinaryData() {
-    return binaryData;
-  }
-  public void setBinaryData(String binaryData) {
-    this.binaryData = binaryData;
-  }
-
-
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
-    if (o == null || getClass() != o.getClass()) {
-      return false;
-    }
-    DeviceConfigRequest deviceConfigRequest = (DeviceConfigRequest) o;
-    return Objects.equals(versionToUpdate, deviceConfigRequest.versionToUpdate) &&
-        Objects.equals(binaryData, deviceConfigRequest.binaryData);
-  }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(versionToUpdate, binaryData);
-  }
-
-  @Override
-  public String toString() {
-    StringBuilder sb = new StringBuilder();
-    sb.append("class DeviceConfigRequest {\n");
-    
-    sb.append("    versionToUpdate: ").append(toIndentedString(versionToUpdate)).append("\n");
-    sb.append("    binaryData: ").append(toIndentedString(binaryData)).append("\n");
-    sb.append("}");
-    return sb.toString();
-  }
-
-  /**
-   * Convert the given object to string with each line indented by 4 spaces
-   * (except the first line).
-   */
-  private String toIndentedString(Object o) {
-    if (o == null) {
-      return "null";
-    }
-    return o.toString().replace("\n", "\n    ");
-  }
-}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java
deleted file mode 100644
index 892d4001..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/entity/ListDeviceConfigVersionsResponse.java
+++ /dev/null
@@ -1,73 +0,0 @@
-package org.eclipse.hono.communication.api.entity;
-
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
-
-/**
- * A list of a device config versions
- **/
-@JsonInclude(JsonInclude.Include.NON_NULL)
-public class ListDeviceConfigVersionsResponse {
-
-    private List<DeviceConfig> deviceConfigs = new ArrayList<>();
-
-    public ListDeviceConfigVersionsResponse() {
-
-    }
-
-    public ListDeviceConfigVersionsResponse(List<DeviceConfig> deviceConfigs) {
-        this.deviceConfigs = deviceConfigs;
-    }
-
-
-    @JsonProperty("deviceConfigs")
-    public List<DeviceConfig> getDeviceConfigs() {
-        return deviceConfigs;
-    }
-
-    public void setDeviceConfigs(List<DeviceConfig> deviceConfigs) {
-        this.deviceConfigs = deviceConfigs;
-    }
-
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (o == null || getClass() != o.getClass()) {
-            return false;
-        }
-        ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = (ListDeviceConfigVersionsResponse) o;
-        return Objects.equals(deviceConfigs, listDeviceConfigVersionsResponse.deviceConfigs);
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(deviceConfigs);
-    }
-
-    @Override
-    public String toString() {
-
-        String sb = "class ListDeviceConfigVersionsResponse {\n" +
-                "    deviceConfigs: " + toIndentedString(deviceConfigs) + "\n" +
-                "}";
-        return sb;
-    }
-
-    /**
-     * Convert the given object to string with each line indented by 4 spaces
-     * (except the first line).
-     */
-    private String toIndentedString(Object o) {
-        if (o == null) {
-            return "null";
-        }
-        return o.toString().replace("\n", "\n    ");
-    }
-}

From 3c4940fd9a0ed80e3820cea4ca239b64350020d8 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Thu, 23 Feb 2023 13:50:06 +0100
Subject: [PATCH 05/18] change database naming

---
 .../hono/communication/api/data/DeviceConfig.java  |  4 ++++
 .../repository/DeviceConfigsRepositoryImpl.java    | 14 +++++++-------
 .../resources/db/create_device_config_table.sql    | 14 +++++++-------
 3 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
index 509f920a..bebec8c7 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
@@ -49,6 +49,7 @@ public String getVersion() {
         return version;
     }
 
+    @JsonProperty("version")
     public void setVersion(String version) {
         this.version = version;
     }
@@ -59,6 +60,7 @@ public String getCloudUpdateTime() {
         return cloudUpdateTime;
     }
 
+    @JsonProperty("cloud_update_time")
     public void setCloudUpdateTime(String cloudUpdateTime) {
         this.cloudUpdateTime = cloudUpdateTime;
     }
@@ -69,6 +71,7 @@ public String getDeviceAckTime() {
         return deviceAckTime;
     }
 
+    @JsonProperty("device_ack_time")
     public void setDeviceAckTime(String deviceAckTime) {
         this.deviceAckTime = deviceAckTime;
     }
@@ -79,6 +82,7 @@ public String getBinaryData() {
         return binaryData;
     }
 
+    @JsonProperty("binary_data")
     public void setBinaryData(String binaryData) {
         this.binaryData = binaryData;
     }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
index b3ec4e7c..705540c6 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
@@ -39,14 +39,14 @@
  */
 @ApplicationScoped
 public class DeviceConfigsRepositoryImpl implements DeviceConfigsRepository {
-    private final static String SQL_INSERT = "INSERT INTO \"deviceConfig\" (version, \"tenantId\", \"deviceId\", \"cloudUpdateTime\", \"deviceAckTime\", \"binaryData\") " +
+    private final static String SQL_INSERT = "INSERT INTO device_configs (version, tenant_id, device_id, cloud_update_time, device_ack_time, binary_data) " +
             "VALUES (#{version}, #{tenantId}, #{deviceId}, #{cloudUpdateTime}, #{deviceAckTime}, #{binaryData}) RETURNING version";
-    private final static String SQL_LIST = "SELECT version, \"cloudUpdateTime\", COALESCE(\"deviceAckTime\",'') AS  \"deviceAckTime\", \"binaryData\" " +
-            "FROM \"deviceConfig\" WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId} ORDER BY version DESC LIMIT #{limit}";
-    private final static String SQL_DELETE_MIN_VERSION = "DELETE FROM \"deviceConfig\" WHERE\"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId} " +
-            "and version = (SELECT MIN(version) from  \"deviceConfig\" WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId})  RETURNING version";
-    private final static String SQL_FIND_TOTAL_AND_MAX_VERSION = "SELECT COALESCE(COUNT(*), 0) as total, COALESCE(MAX(version), 0) as max_version from \"deviceConfig\" " +
-            "WHERE \"deviceId\" = #{deviceId} and \"tenantId\" =  #{tenantId}";
+    private final static String SQL_LIST = "SELECT version, cloud_update_time, device_ack_time, binary_data " +
+            "FROM device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId} ORDER BY version DESC LIMIT #{limit}";
+    private final static String SQL_DELETE_MIN_VERSION = "DELETE FROM device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId} " +
+            "and version = (SELECT MIN(version) from  device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId})  RETURNING version";
+    private final static String SQL_FIND_TOTAL_AND_MAX_VERSION = "SELECT COALESCE(COUNT(*), 0) as total, COALESCE(MAX(version), 0) as max_version from device_configs " +
+            "WHERE device_id = #{deviceId} and tenant_id =  #{tenantId}";
 
     private final static int MAX_LIMIT = 10;
     private final static Logger log = LoggerFactory.getLogger(DeviceConfigsRepositoryImpl.class);
diff --git a/device-communication/src/main/resources/db/create_device_config_table.sql b/device-communication/src/main/resources/db/create_device_config_table.sql
index 1f11816d..ae425132 100644
--- a/device-communication/src/main/resources/db/create_device_config_table.sql
+++ b/device-communication/src/main/resources/db/create_device_config_table.sql
@@ -15,14 +15,14 @@
  */
 
 
-CREATE TABLE IF NOT EXISTS "deviceConfig"
+CREATE TABLE IF NOT EXISTS device_configs
 (
     version           INT          not null,
-    "tenantId"        VARCHAR(100) not null,
-    "deviceId"        VARCHAR(100) not null,
-    "cloudUpdateTime" VARCHAR(100) not null,
-    "deviceAckTime"   VARCHAR(100),
-    "binaryData"      VARCHAR      not null,
+    tenant_id         VARCHAR(100) not null,
+    device_id         VARCHAR(100) not null,
+    cloud_update_time VARCHAR(100) not null,
+    device_ack_time   VARCHAR(100),
+    binary_data       VARCHAR      not null,
 
-    PRIMARY KEY (version, "tenantId", "deviceId")
+    PRIMARY KEY (version, tenant_id, device_id)
 )
\ No newline at end of file

From 466b487695480816e0b43e22c6dce488302192ae Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Mon, 27 Feb 2023 13:34:06 +0100
Subject: [PATCH 06/18] fix hono check style

---
 device-communication/pom.xml                  |  32 ++++++
 .../hono/communication/api/Application.java   |  18 +++-
 .../api/DeviceCommunicationHttpServer.java    | 102 +++++++++---------
 .../api/config/DeviceCommandConstants.java    |  14 ++-
 .../api/config/DeviceConfigsConstants.java    |  40 +++++--
 .../api/data/DeviceCommandRequest.java        |  43 ++++++--
 .../communication/api/data/DeviceConfig.java  |  31 ++++--
 .../api/data/DeviceConfigEntity.java          |  29 +++--
 .../api/data/DeviceConfigRequest.java         |  43 ++++++--
 .../api/data/DeviceConfigResponse.java        |  84 ---------------
 .../ListDeviceConfigVersionsResponse.java     |  43 ++++++--
 .../exception/DeviceNotFoundException.java    |  36 +++++--
 ...Handler.java => DeviceCommandHandler.java} |  27 +++--
 .../api/handler/DeviceConfigsHandler.java     |  53 ++++++---
 .../api/mapper/DeviceConfigMapper.java        |  26 +++--
 .../repository/DeviceConfigsRepository.java   |  26 ++++-
 .../DeviceConfigsRepositoryImpl.java          |  83 +++++++-------
 .../api/service/DatabaseSchemaCreator.java    |   6 +-
 .../service/DatabaseSchemaCreatorImpl.java    |  28 +++--
 .../api/service/DatabaseService.java          |  10 +-
 .../api/service/DatabaseServiceImpl.java      |  36 +++----
 .../api/service/DeviceCommandService.java     |   8 +-
 .../api/service/DeviceCommandServiceImpl.java |  15 ++-
 .../api/service/DeviceConfigService.java      |  25 ++++-
 .../api/service/DeviceConfigServiceImpl.java  |  35 +++---
 .../VertxHttpHandlerManagerService.java       |  20 ++--
 .../core/app/AbstractServiceApplication.java  |  43 +++++---
 .../core/app/ApplicationConfig.java           |  25 +++--
 .../core/app/DatabaseConfig.java              |   5 +-
 .../communication/core/app/ServerConfig.java  |   5 +-
 .../core/http/AbstractVertxHttpServer.java    |  14 ++-
 .../communication/core/http/HttpServer.java   |   6 +-
 .../core/http/HttpServiceBase.java            |   7 +-
 .../communication/core/utils/DbUtils.java     |  27 +++--
 .../core/utils/ResponseUtils.java             |  33 ++++--
 .../api/hono-device-communication-v1.yaml     |  33 +-----
 .../src/main/resources/api/hono-endpoint.yaml |  36 +------
 .../communication/api/ApplicationTest.java    |  17 ++-
 .../DeviceCommunicationHttpServerTest.java    |  64 ++++++-----
 .../handler/DeviceCommandsHandlerTest.java    |  21 ++--
 .../api/handler/DeviceConfigsHandlerTest.java |  59 +++++-----
 .../DatabaseSchemaCreatorImplTest.java        |  16 +--
 .../api/service/DatabaseServiceImplTest.java  |  14 +--
 .../service/DeviceConfigServiceImplTest.java  |  38 +++----
 44 files changed, 805 insertions(+), 571 deletions(-)
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
 rename device-communication/src/main/java/org/eclipse/hono/communication/api/handler/{DeviceCommandsHandler.java => DeviceCommandHandler.java} (70%)

diff --git a/device-communication/pom.xml b/device-communication/pom.xml
index 470b55f5..23fa49a4 100644
--- a/device-communication/pom.xml
+++ b/device-communication/pom.xml
@@ -17,6 +17,7 @@
         <skipITs>true</skipITs>
         <surefire-plugin.version>3.0.0-M7</surefire-plugin.version>
         <org.mapstruct.version>1.5.3.Final</org.mapstruct.version>
+        <hono.version>2.1.0</hono.version>
     </properties>
     <dependencyManagement>
         <dependencies>
@@ -166,6 +167,37 @@
 
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.1.2</version>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.eclipse.hono</groupId>
+                        <artifactId>hono-legal</artifactId>
+                        <version>${hono.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>com.puppycrawl.tools</groupId>
+                        <artifactId>checkstyle</artifactId>
+                        <version>10.2</version>
+                    </dependency>
+                </dependencies>
+                <executions>
+                    <execution>
+                        <id>checkstyle-check</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <configLocation>checkstyle/default.xml</configLocation>
+                    <suppressionsLocation>checkstyle/suppressions.xml</suppressionsLocation>
+                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
     <profiles>
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java
index 6fbbd88f..5be95fd9 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/Application.java
@@ -16,24 +16,32 @@
 
 package org.eclipse.hono.communication.api;
 
-import io.vertx.core.Vertx;
 import org.eclipse.hono.communication.core.app.AbstractServiceApplication;
 import org.eclipse.hono.communication.core.app.ApplicationConfig;
 import org.eclipse.hono.communication.core.http.HttpServer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import io.vertx.core.Vertx;
+
 /**
- * Device Communication application
+ * Device Communication application.
  */
 public class Application extends AbstractServiceApplication {
 
     private final Logger log = LoggerFactory.getLogger(AbstractServiceApplication.class);
     private final HttpServer server;
 
-    public Application(Vertx vertx,
-                       ApplicationConfig appConfigs,
-                       HttpServer server) {
+    /**
+     * Creates new Application with all dependencies.
+     *
+     * @param vertx      The quarkus Vertx instance
+     * @param appConfigs The application configs
+     * @param server     The http server
+     */
+    public Application(final Vertx vertx,
+                       final ApplicationConfig appConfigs,
+                       final HttpServer server) {
         super(vertx, appConfigs);
         this.server = server;
     }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index 16dbd644..24e78682 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -16,17 +16,12 @@
 
 package org.eclipse.hono.communication.api;
 
-import io.netty.handler.codec.http.HttpHeaderNames;
-import io.quarkus.runtime.Quarkus;
-import io.vertx.core.Vertx;
-import io.vertx.core.http.HttpMethod;
-import io.vertx.core.http.HttpServerOptions;
-import io.vertx.ext.healthchecks.HealthCheckHandler;
-import io.vertx.ext.healthchecks.Status;
-import io.vertx.ext.web.Router;
-import io.vertx.ext.web.RoutingContext;
-import io.vertx.ext.web.openapi.RouterBuilder;
-import io.vertx.ext.web.validation.BadRequestException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+import javax.inject.Singleton;
+
 import org.eclipse.hono.communication.api.service.DatabaseSchemaCreator;
 import org.eclipse.hono.communication.api.service.DatabaseService;
 import org.eclipse.hono.communication.api.service.VertxHttpHandlerManagerService;
@@ -39,13 +34,21 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.inject.Singleton;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
+import io.netty.handler.codec.http.HttpHeaderNames;
+import io.quarkus.runtime.Quarkus;
+import io.vertx.core.Vertx;
+import io.vertx.core.http.HttpMethod;
+import io.vertx.core.http.HttpServerOptions;
+import io.vertx.ext.healthchecks.HealthCheckHandler;
+import io.vertx.ext.healthchecks.Status;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
+import io.vertx.ext.web.validation.BadRequestException;
+
 
 /**
- * Vertx HTTP Server for the device communication api
+ * Vertx HTTP Server for the device communication api.
  */
 @Singleton
 public class DeviceCommunicationHttpServer extends AbstractVertxHttpServer implements HttpServer {
@@ -59,11 +62,20 @@ public class DeviceCommunicationHttpServer extends AbstractVertxHttpServer imple
     private List<HttpEndpointHandler> httpEndpointHandlers;
 
 
-    public DeviceCommunicationHttpServer(ApplicationConfig appConfigs,
-                                         Vertx vertx,
-                                         VertxHttpHandlerManagerService httpHandlerManager,
-                                         DatabaseService databaseService,
-                                         DatabaseSchemaCreator databaseSchemaCreator) {
+    /**
+     * Creates a new DeviceCommunicationHttpServer with all dependencies.
+     *
+     * @param appConfigs            THe application configurations
+     * @param vertx                 The quarkus Vertx instance
+     * @param httpHandlerManager    The http handler manager
+     * @param databaseService       The database connection
+     * @param databaseSchemaCreator The database migrations service
+     */
+    public DeviceCommunicationHttpServer(final ApplicationConfig appConfigs,
+                                         final Vertx vertx,
+                                         final VertxHttpHandlerManagerService httpHandlerManager,
+                                         final DatabaseService databaseService,
+                                         final DatabaseSchemaCreator databaseSchemaCreator) {
         super(appConfigs, vertx);
         this.httpHandlerManager = httpHandlerManager;
         this.databaseSchemaCreator = databaseSchemaCreator;
@@ -80,10 +92,8 @@ public void start() {
         // Create Endpoints Router
         this.httpEndpointHandlers = httpHandlerManager.getAvailableHandlerServices();
         RouterBuilder.create(this.vertx, appConfigs.getServerConfig().getOpenApiFilePath())
-                .onSuccess(routerBuilder ->
-                {
-
-                    Router apiRouter = this.createRouterWithEndpoints(routerBuilder, httpEndpointHandlers);
+                .onSuccess(routerBuilder -> {
+                    final Router apiRouter = this.createRouterWithEndpoints(routerBuilder, httpEndpointHandlers);
                     this.startVertxServer(apiRouter);
                 })
                 .onFailure(error -> {
@@ -103,26 +113,26 @@ public void start() {
     }
 
     /**
-     * Creates the Router object and adds endpoints and handlers
+     * Creates the Router object and adds endpoints and handlers.
      *
      * @param routerBuilder        Vertx RouterBuilder object
      * @param httpEndpointHandlers All available http endpoint handlers
      * @return The created Router object
      */
-    Router createRouterWithEndpoints(RouterBuilder routerBuilder, List<HttpEndpointHandler> httpEndpointHandlers) {
+    Router createRouterWithEndpoints(final RouterBuilder routerBuilder, final List<HttpEndpointHandler> httpEndpointHandlers) {
         for (HttpEndpointHandler handlerService : httpEndpointHandlers) {
             handlerService.addRoutes(routerBuilder);
         }
-        var apiRouter = Router.router(vertx);
-        var router = routerBuilder.createRouter();
+        final var apiRouter = Router.router(vertx);
+        final var router = routerBuilder.createRouter();
         apiRouter.errorHandler(400, routingContext ->
                 ResponseUtils.errorResponse(routingContext, routingContext.failure()));
         apiRouter.errorHandler(404, routingContext ->
                 ResponseUtils.errorResponse(routingContext, routingContext.failure()));
 
-        var serverConfig = appConfigs.getServerConfig();
+        final var serverConfig = appConfigs.getServerConfig();
         addHealthCheckHandlers(apiRouter, serverConfig);
-        var basePath = String.format("%s*", serverConfig.getBasePath()); // absolut path not allowed only /*
+        final var basePath = String.format("%s*", serverConfig.getBasePath()); // absolut path not allowed only /*
 
         log.info("API base path: {}", basePath);
 
@@ -131,16 +141,16 @@ Router createRouterWithEndpoints(RouterBuilder routerBuilder, List<HttpEndpointH
     }
 
     /**
-     * Adds readiness and liveness handlers
+     * Adds readiness and liveness handlers.
      *
      * @param router Created router object
      */
-    private void addHealthCheckHandlers(Router router, ServerConfig serverConfig) {
+    private void addHealthCheckHandlers(final Router router, final ServerConfig serverConfig) {
         addReadinessHandlers(router, serverConfig.getReadinessPath());
         addLivenessHandlers(router, serverConfig.getLivenessPath());
     }
 
-    private void addReadinessHandlers(Router router, String readinessPath) {
+    private void addReadinessHandlers(final Router router, final String readinessPath) {
         log.info("Adding readiness path: {}", readinessPath);
         final HealthCheckHandler healthCheckHandler = HealthCheckHandler.create(vertx);
 
@@ -161,29 +171,25 @@ private void addReadinessHandlers(Router router, String readinessPath) {
     }
 
 
-    private void addLivenessHandlers(Router router, String livenessPath) {
+    private void addLivenessHandlers(final Router router, final String livenessPath) {
         log.info("Adding liveness path: {}", livenessPath);
         final HealthCheckHandler healthCheckHandler = HealthCheckHandler.create(vertx);
-
-        healthCheckHandler.register("liveness",
-                promise -> promise.tryComplete(Status.OK())
-        );
-
+        healthCheckHandler.register("liveness", promise -> promise.tryComplete(Status.OK()));
         router.get(livenessPath).handler(healthCheckHandler);
     }
 
     /**
-     * Starts the server and blocks until application is stopped
+     * Starts the server and blocks until application is stopped.
      *
      * @param router The Router object
      */
-    void startVertxServer(Router router) {
-        var serverConfigs = appConfigs.getServerConfig();
-        var serverOptions = new HttpServerOptions()
+    void startVertxServer(final Router router) {
+        final var serverConfigs = appConfigs.getServerConfig();
+        final var serverOptions = new HttpServerOptions()
                 .setPort(serverConfigs.getServerPort())
                 .setHost(serverConfigs.getServerUrl());
 
-        var serverCreationFuture = vertx
+        final var serverCreationFuture = vertx
                 .createHttpServer(serverOptions)
                 .requestHandler(router)
                 .listen();
@@ -200,9 +206,9 @@ void startVertxServer(Router router) {
      * @param routingContext the routing context object
      * @Throws: NullPointerException – if routingContext is {@code null}.
      */
-    void addDefault400ExceptionHandler(RoutingContext routingContext) {
+    void addDefault400ExceptionHandler(final RoutingContext routingContext) {
         Objects.requireNonNull(routingContext);
-        String errorMsg = ((BadRequestException) routingContext.failure()).toJson().toString();
+        final String errorMsg = ((BadRequestException) routingContext.failure()).toJson().toString();
         log.error(errorMsg);
         routingContext.response().setStatusCode(400).end(errorMsg);
     }
@@ -213,7 +219,7 @@ void addDefault400ExceptionHandler(RoutingContext routingContext) {
      * @param routingContext the routing context object
      * @Throws: NullPointerException – if routingContext is {@code null}.
      */
-    void addDefault404ExceptionHandler(RoutingContext routingContext) {
+    void addDefault404ExceptionHandler(final RoutingContext routingContext) {
         Objects.requireNonNull(routingContext);
         if (!routingContext.response().ended()) {
             routingContext.response().setStatusCode(404);
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java
index 2e1f3c2f..ec3778f2 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceCommandConstants.java
@@ -17,10 +17,16 @@
 package org.eclipse.hono.communication.api.config;
 
 /**
- * Device commands constant values
+ * Device commands constant values.
  */
-public class DeviceCommandConstants {
+public final class DeviceCommandConstants {
 
-    // Open api operationIds
-    public final static String POST_DEVICE_COMMAND_OP_ID = "postCommand";
+    /**
+     * OpenApi POST device command operation id.
+     */
+    public static final String POST_DEVICE_COMMAND_OP_ID = "postCommand";
+
+    private DeviceCommandConstants() {
+        // avoid instantiation
+    }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
index 18bbc869..86ff6ed2 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/config/DeviceConfigsConstants.java
@@ -17,17 +17,37 @@
 package org.eclipse.hono.communication.api.config;
 
 /**
- * Device configs constant values
+ * Device configs constant values.
  */
-public class DeviceConfigsConstants {
+public final class DeviceConfigsConstants {
 
-    // Open api operationIds
-    public final static String POST_MODIFY_DEVICE_CONFIG_OP_ID = "modifyCloudToDeviceConfig";
-    public final static String LIST_CONFIG_VERSIONS_OP_ID = "listConfigVersions";
+    /**
+     * OpenApi GET device configs operation id.
+     */
+    public static final String LIST_CONFIG_VERSIONS_OP_ID = "listConfigVersions";
+    /**
+     * Path parameter name for tenantId.
+     */
+    public static final String TENANT_PATH_PARAMS = "tenantid";
+    /**
+     * Path parameter name for deviceId.
+     */
+    public static final String DEVICE_PATH_PARAMS = "deviceid";
+    /**
+     * Path parameter name for number of versions.
+     */
+    public static final String NUM_VERSION_QUERY_PARAMS = "numVersions";
 
-    //Device Config Repository
-    public final static String TENANT_PATH_PARAMS = "tenantid";
-    public final static String DEVICE_PATH_PARAMS = "deviceid";
-    public final static String NUM_VERSION_QUERY_PARAMS = "numVersions";
-    public final static String CREATE_SQL_SCRIPT_PATH = "db/create_device_config_table.sql";
+    /**
+     * Sql migrations script path.
+     */
+    public static final String CREATE_SQL_SCRIPT_PATH = "db/create_device_config_table.sql";
+    /**
+     * OpenApi POST device configs operation id.
+     */
+    public static final String POST_MODIFY_DEVICE_CONFIG_OP_ID = "modifyCloudToDeviceConfig";
+
+    private DeviceConfigsConstants() {
+        // avoid instantiation
+    }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java
index 27a253be..91d7874e 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceCommandRequest.java
@@ -1,12 +1,30 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
 package org.eclipse.hono.communication.api.data;
 
+import java.util.Objects;
+
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
-import java.util.Objects;
+
+
 
 /**
- * Command json object structure
+ * Command json object structure.
  **/
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class DeviceCommandRequest {
@@ -14,11 +32,20 @@ public class DeviceCommandRequest {
     private String binaryData;
     private String subfolder;
 
+    /**
+     * Creates a new DeviceCommandRequest.
+     */
     public DeviceCommandRequest() {
 
     }
 
-    public DeviceCommandRequest(String binaryData, String subfolder) {
+    /**
+     * Creates a new DeviceCommandRequest.
+     *
+     * @param binaryData Binary data
+     * @param subfolder  THe subfolder
+     */
+    public DeviceCommandRequest(final String binaryData, final String subfolder) {
         this.binaryData = binaryData;
         this.subfolder = subfolder;
     }
@@ -29,7 +56,7 @@ public String getBinaryData() {
         return binaryData;
     }
 
-    public void setBinaryData(String binaryData) {
+    public void setBinaryData(final String binaryData) {
         this.binaryData = binaryData;
     }
 
@@ -39,20 +66,20 @@ public String getSubfolder() {
         return subfolder;
     }
 
-    public void setSubfolder(String subfolder) {
+    public void setSubfolder(final String subfolder) {
         this.subfolder = subfolder;
     }
 
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(final Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
-        DeviceCommandRequest deviceCommandRequest = (DeviceCommandRequest) o;
+        final DeviceCommandRequest deviceCommandRequest = (DeviceCommandRequest) o;
         return Objects.equals(binaryData, deviceCommandRequest.binaryData) &&
                 Objects.equals(subfolder, deviceCommandRequest.subfolder);
     }
@@ -75,7 +102,7 @@ public String toString() {
      * Convert the given object to string with each line indented by 4 spaces
      * (except the first line).
      */
-    private String toIndentedString(Object o) {
+    private String toIndentedString(final Object o) {
         if (o == null) {
             return "null";
         }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
index bebec8c7..47425745 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfig.java
@@ -16,10 +16,12 @@
 
 package org.eclipse.hono.communication.api.data;
 
+import java.util.Objects;
+
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
-import java.util.Objects;
+
 
 /**
  * The device configuration.
@@ -32,11 +34,22 @@ public class DeviceConfig {
     private String deviceAckTime;
     private String binaryData;
 
+    /**
+     * Creates a new device config.
+     */
     public DeviceConfig() {
 
     }
 
-    public DeviceConfig(String version, String cloudUpdateTime, String deviceAckTime, String binaryData) {
+    /**
+     * Creates a new device config.
+     *
+     * @param version         Config version
+     * @param cloudUpdateTime Cloud update time
+     * @param deviceAckTime   Device ack time
+     * @param binaryData      Binary data
+     */
+    public DeviceConfig(final String version, final String cloudUpdateTime, final String deviceAckTime, final String binaryData) {
         this.version = version;
         this.cloudUpdateTime = cloudUpdateTime;
         this.deviceAckTime = deviceAckTime;
@@ -50,7 +63,7 @@ public String getVersion() {
     }
 
     @JsonProperty("version")
-    public void setVersion(String version) {
+    public void setVersion(final String version) {
         this.version = version;
     }
 
@@ -61,7 +74,7 @@ public String getCloudUpdateTime() {
     }
 
     @JsonProperty("cloud_update_time")
-    public void setCloudUpdateTime(String cloudUpdateTime) {
+    public void setCloudUpdateTime(final String cloudUpdateTime) {
         this.cloudUpdateTime = cloudUpdateTime;
     }
 
@@ -72,7 +85,7 @@ public String getDeviceAckTime() {
     }
 
     @JsonProperty("device_ack_time")
-    public void setDeviceAckTime(String deviceAckTime) {
+    public void setDeviceAckTime(final String deviceAckTime) {
         this.deviceAckTime = deviceAckTime;
     }
 
@@ -83,20 +96,20 @@ public String getBinaryData() {
     }
 
     @JsonProperty("binary_data")
-    public void setBinaryData(String binaryData) {
+    public void setBinaryData(final String binaryData) {
         this.binaryData = binaryData;
     }
 
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(final Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
-        DeviceConfig deviceConfig = (DeviceConfig) o;
+        final DeviceConfig deviceConfig = (DeviceConfig) o;
         return Objects.equals(version, deviceConfig.version) &&
                 Objects.equals(cloudUpdateTime, deviceConfig.cloudUpdateTime) &&
                 Objects.equals(deviceAckTime, deviceConfig.deviceAckTime) &&
@@ -123,7 +136,7 @@ public String toString() {
      * Convert the given object to string with each line indented by 4 spaces
      * (except the first line).
      */
-    private String toIndentedString(Object o) {
+    private String toIndentedString(final Object o) {
         if (o == null) {
             return "null";
         }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java
index 69a3d87b..186ccc44 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigEntity.java
@@ -32,7 +32,10 @@ public class DeviceConfigEntity {
     private String deviceAckTime;
     private String binaryData;
 
- 
+
+    /**
+     * Creates new DeviceConfigEntity.
+     */
     public DeviceConfigEntity() {
     }
 
@@ -41,7 +44,7 @@ public int getVersion() {
         return version;
     }
 
-    public void setVersion(int version) {
+    public void setVersion(final int version) {
         this.version = version;
     }
 
@@ -49,7 +52,7 @@ public String getTenantId() {
         return tenantId;
     }
 
-    public void setTenantId(String tenantId) {
+    public void setTenantId(final String tenantId) {
         this.tenantId = tenantId;
     }
 
@@ -57,7 +60,7 @@ public String getDeviceId() {
         return deviceId;
     }
 
-    public void setDeviceId(String deviceId) {
+    public void setDeviceId(final String deviceId) {
         this.deviceId = deviceId;
     }
 
@@ -66,7 +69,7 @@ public String getCloudUpdateTime() {
         return cloudUpdateTime;
     }
 
-    public void setCloudUpdateTime(String cloudUpdateTime) {
+    public void setCloudUpdateTime(final String cloudUpdateTime) {
         this.cloudUpdateTime = cloudUpdateTime;
     }
 
@@ -74,7 +77,7 @@ public String getDeviceAckTime() {
         return deviceAckTime;
     }
 
-    public void setDeviceAckTime(String deviceAckTime) {
+    public void setDeviceAckTime(final String deviceAckTime) {
         this.deviceAckTime = deviceAckTime;
     }
 
@@ -82,7 +85,7 @@ public String getBinaryData() {
         return binaryData;
     }
 
-    public void setBinaryData(String binaryData) {
+    public void setBinaryData(final String binaryData) {
         this.binaryData = binaryData;
     }
 
@@ -100,10 +103,14 @@ public String toString() {
     }
 
     @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        DeviceConfigEntity that = (DeviceConfigEntity) o;
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        final var that = (DeviceConfigEntity) o;
         return version == that.version && tenantId.equals(that.tenantId) && deviceId.equals(that.deviceId) && cloudUpdateTime.equals(that.cloudUpdateTime) && Objects.equals(deviceAckTime, that.deviceAckTime) && binaryData.equals(that.binaryData);
     }
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java
index 7520dd34..fd33dbdb 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigRequest.java
@@ -1,12 +1,30 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
+
 package org.eclipse.hono.communication.api.data;
 
+import java.util.Objects;
+
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
-import java.util.Objects;
+
 
 /**
- * Request body for modifying device configs
+ * Request body for modifying device configs.
  **/
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class DeviceConfigRequest {
@@ -14,11 +32,20 @@ public class DeviceConfigRequest {
     private String versionToUpdate;
     private String binaryData;
 
+    /**
+     * Creates a new DeviceConfigRequest.
+     */
     public DeviceConfigRequest() {
 
     }
 
-    public DeviceConfigRequest(String versionToUpdate, String binaryData) {
+    /**
+     * Creates a new DeviceConfigRequest.
+     *
+     * @param versionToUpdate Version to update
+     * @param binaryData      The binary data
+     */
+    public DeviceConfigRequest(final String versionToUpdate, final String binaryData) {
         this.versionToUpdate = versionToUpdate;
         this.binaryData = binaryData;
     }
@@ -29,7 +56,7 @@ public String getVersionToUpdate() {
         return versionToUpdate;
     }
 
-    public void setVersionToUpdate(String versionToUpdate) {
+    public void setVersionToUpdate(final String versionToUpdate) {
         this.versionToUpdate = versionToUpdate;
     }
 
@@ -39,20 +66,20 @@ public String getBinaryData() {
         return binaryData;
     }
 
-    public void setBinaryData(String binaryData) {
+    public void setBinaryData(final String binaryData) {
         this.binaryData = binaryData;
     }
 
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(final Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
-        DeviceConfigRequest deviceConfigRequest = (DeviceConfigRequest) o;
+        final var deviceConfigRequest = (DeviceConfigRequest) o;
         return Objects.equals(versionToUpdate, deviceConfigRequest.versionToUpdate) &&
                 Objects.equals(binaryData, deviceConfigRequest.binaryData);
     }
@@ -75,7 +102,7 @@ public String toString() {
      * Convert the given object to string with each line indented by 4 spaces
      * (except the first line).
      */
-    private String toIndentedString(Object o) {
+    private String toIndentedString(final Object o) {
         if (o == null) {
             return "null";
         }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
deleted file mode 100644
index 017fa248..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/DeviceConfigResponse.java
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * ***********************************************************
- *  Copyright (c) 2023 Contributors to the Eclipse Foundation
- *  <p>
- *  See the NOTICE file(s) distributed with this work for additional
- *  information regarding copyright ownership.
- *  <p>
- *  This program and the accompanying materials are made available under the
- *  terms of the Eclipse Public License 2.0 which is available at
- *  http://www.eclipse.org/legal/epl-2.0
- *  <p>
- *  SPDX-License-Identifier: EPL-2.0
- * **********************************************************
- *
- */
-
-package org.eclipse.hono.communication.api.data;
-
-import java.util.Objects;
-
-/**
- * The device configuration response class.
- **/
-public class DeviceConfigResponse {
-
-
-    private int version;
-    private String cloudUpdateTime;
-    private String binaryData;
-
-
-    public DeviceConfigResponse() {
-    }
-
-
-    public int getVersion() {
-        return version;
-    }
-
-    public void setVersion(int version) {
-        this.version = version;
-    }
-
-    public String getCloudUpdateTime() {
-        return cloudUpdateTime;
-    }
-
-    public void setCloudUpdateTime(String cloudUpdateTime) {
-        this.cloudUpdateTime = cloudUpdateTime;
-    }
-
-    public String getBinaryData() {
-        return binaryData;
-    }
-
-    public void setBinaryData(String binaryData) {
-        this.binaryData = binaryData;
-    }
-
-
-    @Override
-    public String toString() {
-        return "DeviceConfigResponse{" +
-                "version=" + version +
-                ", cloudUpdateTime='" + cloudUpdateTime + '\'' +
-                ", binaryData='" + binaryData + '\'' +
-                '}';
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        DeviceConfigResponse that = (DeviceConfigResponse) o;
-        return version == that.version && cloudUpdateTime.equals(that.cloudUpdateTime) && binaryData.equals(that.binaryData);
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(version, cloudUpdateTime, binaryData);
-    }
-
-
-}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java
index 2d4f5570..9e0894cf 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/data/ListDeviceConfigVersionsResponse.java
@@ -1,25 +1,50 @@
+/*
+ * ***********************************************************
+ *  Copyright (c) 2023 Contributors to the Eclipse Foundation
+ *  <p>
+ *  See the NOTICE file(s) distributed with this work for additional
+ *  information regarding copyright ownership.
+ *  <p>
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Eclipse Public License 2.0 which is available at
+ *  http://www.eclipse.org/legal/epl-2.0
+ *  <p>
+ *  SPDX-License-Identifier: EPL-2.0
+ * **********************************************************
+ *
+ */
 package org.eclipse.hono.communication.api.data;
 
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.annotation.JsonProperty;
-
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+
+
 /**
- * A list of a device config versions
+ * A list of a device config versions.
  **/
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class ListDeviceConfigVersionsResponse {
 
     private List<DeviceConfig> deviceConfigs = new ArrayList<>();
 
+    /**
+     * Creates a new ListDeviceConfigVersionsResponse.
+     */
     public ListDeviceConfigVersionsResponse() {
 
     }
 
-    public ListDeviceConfigVersionsResponse(List<DeviceConfig> deviceConfigs) {
+    /**
+     * Creates a new ListDeviceConfigVersionsResponse.
+     *
+     * @param deviceConfigs The device configs
+     */
+    public ListDeviceConfigVersionsResponse(final List<DeviceConfig> deviceConfigs) {
         this.deviceConfigs = deviceConfigs;
     }
 
@@ -29,20 +54,20 @@ public List<DeviceConfig> getDeviceConfigs() {
         return deviceConfigs;
     }
 
-    public void setDeviceConfigs(List<DeviceConfig> deviceConfigs) {
+    public void setDeviceConfigs(final List<DeviceConfig> deviceConfigs) {
         this.deviceConfigs = deviceConfigs;
     }
 
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(final Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
-        ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = (ListDeviceConfigVersionsResponse) o;
+        final var listDeviceConfigVersionsResponse = (ListDeviceConfigVersionsResponse) o;
         return Objects.equals(deviceConfigs, listDeviceConfigVersionsResponse.deviceConfigs);
     }
 
@@ -63,7 +88,7 @@ public String toString() {
      * Convert the given object to string with each line indented by 4 spaces
      * (except the first line).
      */
-    private String toIndentedString(Object o) {
+    private String toIndentedString(final Object o) {
         if (o == null) {
             return "null";
         }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java
index af805085..7c83515f 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/exception/DeviceNotFoundException.java
@@ -19,21 +19,43 @@
 import java.util.NoSuchElementException;
 
 /**
- * Device Not found exception code: 404
+ * Device Not found exception code: 404.
  */
-public class DeviceNotFoundException extends NoSuchElementException {
+public class
+DeviceNotFoundException extends NoSuchElementException {
+
+    /**
+     * Creates a new  DeviceNotFoundException.
+     */
     public DeviceNotFoundException() {
     }
 
-    public DeviceNotFoundException(String s, Throwable cause) {
-        super(s, cause);
+    /**
+     * Creates a new  DeviceNotFoundException.
+     *
+     * @param msg   String message
+     * @param cause Throwable
+     */
+    public DeviceNotFoundException(final String msg, final Throwable cause) {
+        super(msg, cause);
     }
 
-    public DeviceNotFoundException(Throwable cause) {
+    /**
+     * Creates a new  DeviceNotFoundException.
+     *
+     * @param cause Throwable
+     */
+    public DeviceNotFoundException(final Throwable cause) {
         super(cause);
     }
 
-    public DeviceNotFoundException(String s) {
-        super(s);
+
+    /**
+     * Creates a new  DeviceNotFoundException.
+     *
+     * @param msg String message
+     */
+    public DeviceNotFoundException(final String msg) {
+        super(msg);
     }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandHandler.java
similarity index 70%
rename from device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
rename to device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandHandler.java
index f27b6afc..e95fc0aa 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandler.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceCommandHandler.java
@@ -16,33 +16,44 @@
 
 package org.eclipse.hono.communication.api.handler;
 
-import io.vertx.ext.web.RoutingContext;
-import io.vertx.ext.web.openapi.RouterBuilder;
+import javax.enterprise.context.ApplicationScoped;
+
 import org.eclipse.hono.communication.api.config.DeviceCommandConstants;
 import org.eclipse.hono.communication.api.service.DeviceCommandService;
 import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
 
-import javax.enterprise.context.ApplicationScoped;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
 
 /**
- * Handler for device command endpoints
+ * Handler for device command endpoints.
  */
 @ApplicationScoped
-public class DeviceCommandsHandler implements HttpEndpointHandler {
+public class DeviceCommandHandler implements HttpEndpointHandler {
 
     private final DeviceCommandService commandService;
 
-    public DeviceCommandsHandler(DeviceCommandService commandService) {
+    /**
+     * Creates a new DeviceCommandHandler.
+     *
+     * @param commandService The device command service
+     */
+    public DeviceCommandHandler(final DeviceCommandService commandService) {
         this.commandService = commandService;
     }
 
     @Override
-    public void addRoutes(RouterBuilder routerBuilder) {
+    public void addRoutes(final RouterBuilder routerBuilder) {
         routerBuilder.operation(DeviceCommandConstants.POST_DEVICE_COMMAND_OP_ID)
                 .handler(this::handlePostCommand);
     }
 
-    public void handlePostCommand(RoutingContext routingContext) {
+    /**
+     * Handle post device commands.
+     *
+     * @param routingContext The RoutingContext
+     */
+    public void handlePostCommand(final RoutingContext routingContext) {
         commandService.postCommand(routingContext);
     }
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
index 26ab7620..a1649e23 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandler.java
@@ -16,43 +16,58 @@
 
 package org.eclipse.hono.communication.api.handler;
 
-import io.vertx.core.Future;
-import io.vertx.ext.web.RoutingContext;
-import io.vertx.ext.web.openapi.RouterBuilder;
+import javax.enterprise.context.ApplicationScoped;
+
 import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
+import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.service.DeviceConfigService;
 import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
 import org.eclipse.hono.communication.core.utils.ResponseUtils;
 
-import javax.enterprise.context.ApplicationScoped;
+import io.vertx.core.Future;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.RouterBuilder;
+
+
+
 
 /**
- * Handler for device config endpoints
+ * Handler for device config endpoints.
  */
 @ApplicationScoped
 public class DeviceConfigsHandler implements HttpEndpointHandler {
 
     private final DeviceConfigService configService;
 
-    public DeviceConfigsHandler(DeviceConfigService configService) {
+    /**
+     * Creates a new DeviceConfigsHandler.
+     *
+     * @param configService The device configs
+     */
+    public DeviceConfigsHandler(final DeviceConfigService configService) {
         this.configService = configService;
     }
 
 
     @Override
-    public void addRoutes(RouterBuilder routerBuilder) {
+    public void addRoutes(final RouterBuilder routerBuilder) {
         routerBuilder.operation(DeviceConfigsConstants.LIST_CONFIG_VERSIONS_OP_ID)
                 .handler(this::handleListConfigVersions);
         routerBuilder.operation(DeviceConfigsConstants.POST_MODIFY_DEVICE_CONFIG_OP_ID)
                 .handler(this::handleModifyCloudToDeviceConfig);
     }
 
-    public Future<DeviceConfigResponse> handleModifyCloudToDeviceConfig(RoutingContext routingContext) {
-        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
-        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
+    /**
+     * Handles post device configs.
+     *
+     * @param routingContext The RoutingContext
+     * @return Future of DeviceConfig
+     */
+    public Future<DeviceConfig> handleModifyCloudToDeviceConfig(final RoutingContext routingContext) {
+        final var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
+        final var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
 
         final DeviceConfigRequest deviceConfig = routingContext.body()
                 .asJsonObject()
@@ -63,12 +78,18 @@ public Future<DeviceConfigResponse> handleModifyCloudToDeviceConfig(RoutingConte
                 .onFailure(err -> ResponseUtils.errorResponse(routingContext, err));
     }
 
-    public Future<ListDeviceConfigVersionsResponse> handleListConfigVersions(RoutingContext routingContext) {
-        var numVersions = routingContext.queryParams().get(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS);
+    /**
+     * Handles get device configs.
+     *
+     * @param routingContext The RoutingContext
+     * @return Future of ListDeviceConfigVersionsResponse
+     */
+    public Future<ListDeviceConfigVersionsResponse> handleListConfigVersions(final RoutingContext routingContext) {
+        final var numVersions = routingContext.queryParams().get(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS);
 
-        var limit = numVersions == null ? 0 : Integer.parseInt(numVersions);
-        var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
-        var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
+        final var limit = numVersions == null ? 0 : Integer.parseInt(numVersions);
+        final var tenantId = routingContext.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
+        final var deviceId = routingContext.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS);
 
         return configService.listAll(deviceId, tenantId, limit)
                 .onSuccess(result -> ResponseUtils.successResponse(routingContext, result))
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
index 0a465125..5a7783f5 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/mapper/DeviceConfigMapper.java
@@ -16,23 +16,37 @@
 
 package org.eclipse.hono.communication.api.mapper;
 
+import java.time.Instant;
+
+import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
 import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.mapstruct.Mapper;
 import org.mapstruct.Mapping;
 import org.mapstruct.NullValuePropertyMappingStrategy;
 
-import java.time.Instant;
-
+/**
+ * Mapper for device config objects.
+ */
 @Mapper(componentModel = "cdi",
         nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
 public interface DeviceConfigMapper {
 
 
-    DeviceConfigResponse deviceConfigEntityToResponse(DeviceConfigEntity entity);
-
-
+    /**
+     * Convert device config entity to device config.
+     *
+     * @param entity The device config entity
+     * @return The device config
+     */
+    DeviceConfig deviceConfigEntityToConfig(DeviceConfigEntity entity);
+
+    /**
+     * Convert device config request to device config entity.
+     *
+     * @param request The device config request
+     * @return The device config entity
+     */
     @Mapping(target = "version", source = "request.versionToUpdate")
     @Mapping(target = "cloudUpdateTime", expression = "java(getDateTime())")
     DeviceConfigEntity configRequestToDeviceConfigEntity(DeviceConfigRequest request);
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
index f1e7effa..4e08c1b5 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepository.java
@@ -16,19 +16,37 @@
 
 package org.eclipse.hono.communication.api.repository;
 
-import io.vertx.core.Future;
-import io.vertx.sqlclient.SqlConnection;
+import java.util.List;
+
 import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
 
-import java.util.List;
+import io.vertx.core.Future;
+import io.vertx.sqlclient.SqlConnection;
 
 /**
- * Device config repository interface
+ * Device config repository interface.
  */
 public interface DeviceConfigsRepository {
 
+    /**
+     * Lists all config versions for a specific device. Result is order by version desc
+     *
+     * @param sqlConnection The sql connection instance
+     * @param deviceId      The device id
+     * @param tenantId      The tenant id
+     * @param limit         The number of config to show
+     * @return A Future with a List of DeviceConfigs
+     */
     Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit);
 
+
+    /**
+     * Creates a new config version and deletes the oldest version if the total num of versions in DB is bigger than the MAX_LIMIT.
+     *
+     * @param sqlConnection The sql connection instance
+     * @param entity        The instance to insert
+     * @return A Future of the created DeviceConfigEntity
+     */
     Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceConfigEntity entity);
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
index 705540c6..f2ace5b8 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/repository/DeviceConfigsRepositoryImpl.java
@@ -16,6 +16,18 @@
 
 package org.eclipse.hono.communication.api.repository;
 
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import javax.enterprise.context.ApplicationScoped;
+
+import org.eclipse.hono.communication.api.data.DeviceConfig;
+import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
+import org.eclipse.hono.communication.api.exception.DeviceNotFoundException;
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
+import org.graalvm.collections.Pair;
+
 import io.vertx.core.Future;
 import io.vertx.core.impl.logging.Logger;
 import io.vertx.core.impl.logging.LoggerFactory;
@@ -23,37 +35,32 @@
 import io.vertx.sqlclient.SqlConnection;
 import io.vertx.sqlclient.templates.RowMapper;
 import io.vertx.sqlclient.templates.SqlTemplate;
-import org.eclipse.hono.communication.api.data.DeviceConfig;
-import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
-import org.eclipse.hono.communication.api.exception.DeviceNotFoundException;
-import org.eclipse.hono.communication.core.app.DatabaseConfig;
-import org.graalvm.collections.Pair;
-
-import javax.enterprise.context.ApplicationScoped;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
 
 /**
- * Repository class for making CRUD operations for device config entities
+ * Repository class for making CRUD operations for device config entities.
  */
 @ApplicationScoped
 public class DeviceConfigsRepositoryImpl implements DeviceConfigsRepository {
-    private final static String SQL_INSERT = "INSERT INTO device_configs (version, tenant_id, device_id, cloud_update_time, device_ack_time, binary_data) " +
+    private final String SQL_INSERT = "INSERT INTO device_configs (version, tenant_id, device_id, cloud_update_time, device_ack_time, binary_data) " +
             "VALUES (#{version}, #{tenantId}, #{deviceId}, #{cloudUpdateTime}, #{deviceAckTime}, #{binaryData}) RETURNING version";
-    private final static String SQL_LIST = "SELECT version, cloud_update_time, device_ack_time, binary_data " +
+    private final String SQL_LIST = "SELECT version, cloud_update_time, device_ack_time, binary_data " +
             "FROM device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId} ORDER BY version DESC LIMIT #{limit}";
-    private final static String SQL_DELETE_MIN_VERSION = "DELETE FROM device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId} " +
+    private final String SQL_DELETE_MIN_VERSION = "DELETE FROM device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId} " +
             "and version = (SELECT MIN(version) from  device_configs WHERE device_id = #{deviceId} and tenant_id =  #{tenantId})  RETURNING version";
-    private final static String SQL_FIND_TOTAL_AND_MAX_VERSION = "SELECT COALESCE(COUNT(*), 0) as total, COALESCE(MAX(version), 0) as max_version from device_configs " +
+    private final String SQL_FIND_TOTAL_AND_MAX_VERSION = "SELECT COALESCE(COUNT(*), 0) as total, COALESCE(MAX(version), 0) as max_version from device_configs " +
             "WHERE device_id = #{deviceId} and tenant_id =  #{tenantId}";
 
-    private final static int MAX_LIMIT = 10;
-    private final static Logger log = LoggerFactory.getLogger(DeviceConfigsRepositoryImpl.class);
+    private final int MAX_LIMIT = 10;
+    private final Logger log = LoggerFactory.getLogger(DeviceConfigsRepositoryImpl.class);
     private String SQL_COUNT_DEVICES_WITH_PK_FILTER = "SELECT COUNT(*) as total FROM public.%s where %s = #{tenantId} and %s = #{deviceId}";
 
 
-    public DeviceConfigsRepositoryImpl(DatabaseConfig databaseConfig) {
+    /**
+     * Creates a new  DeviceConfigsRepositoryImpl.
+     *
+     * @param databaseConfig The database configs
+     */
+    public DeviceConfigsRepositoryImpl(final DatabaseConfig databaseConfig) {
 
         SQL_COUNT_DEVICES_WITH_PK_FILTER = String.format(SQL_COUNT_DEVICES_WITH_PK_FILTER,
                 databaseConfig.getDeviceRegistrationTableName(),
@@ -62,7 +69,7 @@ public DeviceConfigsRepositoryImpl(DatabaseConfig databaseConfig) {
     }
 
 
-    private Future<Integer> searchForDevice(SqlConnection sqlConnection, String deviceId, String tenantId) {
+    private Future<Integer> searchForDevice(final SqlConnection sqlConnection, final String deviceId, final String tenantId) {
         final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("total");
         return SqlTemplate
                 .forQuery(sqlConnection, SQL_COUNT_DEVICES_WITH_PK_FILTER)
@@ -74,7 +81,7 @@ private Future<Integer> searchForDevice(SqlConnection sqlConnection, String devi
 
     }
 
-    private Future<Pair<Integer, Integer>> findMaxVersionAndTotalEntries(SqlConnection sqlConnection, String deviceId, String tenantId) {
+    private Future<Pair<Integer, Integer>> findMaxVersionAndTotalEntries(final SqlConnection sqlConnection, final String deviceId, final String tenantId) {
         final RowMapper<Pair<Integer, Integer>> ROW_MAPPER = row ->
                 Pair.create(row.getInteger("total"), row.getInteger("max_version"));
         return SqlTemplate
@@ -87,17 +94,9 @@ private Future<Pair<Integer, Integer>> findMaxVersionAndTotalEntries(SqlConnecti
 
     }
 
-    /**
-     * Lists all config versions for a specific device. Result is order by version desc
-     *
-     * @param sqlConnection The sql connection instance
-     * @param deviceId      The device id
-     * @param tenantId      The tenant id
-     * @param limit         The number of config to show
-     * @return A Future with a List of DeviceConfigs
-     */
-    public Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String deviceId, String tenantId, int limit) {
-        int queryLimit = limit == 0 ? MAX_LIMIT : limit;
+    @Override
+    public Future<List<DeviceConfig>> listAll(final SqlConnection sqlConnection, final String deviceId, final String tenantId, final int limit) {
+        final int queryLimit = limit == 0 ? MAX_LIMIT : limit;
         return searchForDevice(sqlConnection, deviceId, tenantId)
                 .compose(
                         counter -> {
@@ -130,7 +129,7 @@ public Future<List<DeviceConfig>> listAll(SqlConnection sqlConnection, String de
      * @param entity        The instance to insert
      * @return A Future of the created DeviceConfigEntity
      */
-    private Future<DeviceConfigEntity> insert(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+    private Future<DeviceConfigEntity> insert(final SqlConnection sqlConnection, final DeviceConfigEntity entity) {
         return SqlTemplate
                 .forUpdate(sqlConnection, SQL_INSERT)
                 .mapFrom(DeviceConfigEntity.class)
@@ -151,14 +150,14 @@ private Future<DeviceConfigEntity> insert(SqlConnection sqlConnection, DeviceCon
     }
 
     /**
-     * Delete the smallest config version
+     * Delete the smallest config version.
      *
      * @param sqlConnection The sql connection instance
      * @param entity        The device config for searching and deleting the smallest version
      * @return A Future of the deleted version
      */
 
-    private Future<Integer> deleteMinVersion(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+    private Future<Integer> deleteMinVersion(final SqlConnection sqlConnection, final DeviceConfigEntity entity) {
         final RowMapper<Integer> ROW_MAPPER = row -> row.getInteger("version");
         return SqlTemplate
                 .forQuery(sqlConnection, SQL_DELETE_MIN_VERSION)
@@ -173,14 +172,8 @@ private Future<Integer> deleteMinVersion(SqlConnection sqlConnection, DeviceConf
     }
 
 
-    /**
-     * Creates a new config version and deletes the oldest version if the total num of versions in DB is bigger than the MAX_LIMIT.
-     *
-     * @param sqlConnection The sql connection instance
-     * @param entity        The instance to insert
-     * @return A Future of the created DeviceConfigEntity
-     */
-    public Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceConfigEntity entity) {
+    @Override
+    public Future<DeviceConfigEntity> createNew(final SqlConnection sqlConnection, final DeviceConfigEntity entity) {
         return searchForDevice(sqlConnection, entity.getDeviceId(), entity.getTenantId())
                 .compose(
                         counter -> {
@@ -192,8 +185,8 @@ public Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceC
                             return findMaxVersionAndTotalEntries(sqlConnection, entity.getDeviceId(), entity.getTenantId())
                                     .compose(
                                             values -> {
-                                                int total = values.getLeft();
-                                                int maxVersion = values.getRight();
+                                                final int total = values.getLeft();
+                                                final int maxVersion = values.getRight();
 
                                                 entity.setVersion(maxVersion + 1);
 
@@ -208,4 +201,4 @@ public Future<DeviceConfigEntity> createNew(SqlConnection sqlConnection, DeviceC
                                     );
                         }).onFailure(error -> log.error(error.getMessage()));
     }
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java
index f880beb7..86702dd9 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreator.java
@@ -17,8 +17,12 @@
 package org.eclipse.hono.communication.api.service;
 
 /**
- * Interface for creating Database Tables at application startup
+ * Interface for creating Database Tables at application startup.
  */
 public interface DatabaseSchemaCreator {
+
+    /**
+     * Create database tables.
+     */
     void createDBTables();
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java
index 60a93326..d890db0b 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImpl.java
@@ -16,20 +16,22 @@
 
 package org.eclipse.hono.communication.api.service;
 
+import java.util.Map;
+
+import javax.enterprise.context.ApplicationScoped;
+
+import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import io.quarkus.runtime.Quarkus;
 import io.vertx.core.Promise;
 import io.vertx.core.Vertx;
 import io.vertx.core.buffer.Buffer;
 import io.vertx.sqlclient.templates.SqlTemplate;
-import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.enterprise.context.ApplicationScoped;
-import java.util.Map;
 
 /**
- * Creates all Database tables if they are not exist
+ * Creates all Database tables if they are not exist.
  */
 
 @ApplicationScoped
@@ -41,11 +43,18 @@ public class DatabaseSchemaCreatorImpl implements DatabaseSchemaCreator {
     private final DatabaseService db;
 
 
-    public DatabaseSchemaCreatorImpl(Vertx vertx, DatabaseService db) {
+    /**
+     * Creates a new DatabaseSchemaCreatorImpl.
+     *
+     * @param vertx The quarkus Vertx instance
+     * @param db    The database service
+     */
+    public DatabaseSchemaCreatorImpl(final Vertx vertx, final DatabaseService db) {
         this.vertx = vertx;
         this.db = db;
     }
 
+    @Override
     public void createDBTables() {
         createDeviceConfigTable();
     }
@@ -64,8 +73,7 @@ private void createDeviceConfigTable() {
                                                 .forQuery(sqlConnection, script)
                                                 .execute(Map.of())))
                 .onSuccess(ok -> log.info(tableCreationSuccessMsg))
-                .onFailure(error ->
-                {
+                .onFailure(error -> {
                     log.error(tableCreationErrorMsg, error.getMessage());
                     db.close();
                     Quarkus.asyncExit(-1);
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java
index 09f293d4..e8e5bd87 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseService.java
@@ -19,10 +19,18 @@
 import io.vertx.pgclient.PgPool;
 
 /**
- * Database service interface
+ * Database service interface.
  */
 public interface DatabaseService {
+    /**
+     * Gets the database client instance.
+     *
+     * @return The database client
+     */
     PgPool getDbClient();
 
+    /**
+     * Closes the database connection.
+     */
     void close();
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
index 5bda32cb..ab815ba2 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DatabaseServiceImpl.java
@@ -16,48 +16,46 @@
 
 package org.eclipse.hono.communication.api.service;
 
+import javax.enterprise.context.ApplicationScoped;
+
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
+import org.eclipse.hono.communication.core.utils.DbUtils;
+
 import io.vertx.core.Vertx;
 import io.vertx.core.impl.logging.Logger;
 import io.vertx.core.impl.logging.LoggerFactory;
 import io.vertx.pgclient.PgPool;
-import org.eclipse.hono.communication.core.app.DatabaseConfig;
-import org.eclipse.hono.communication.core.utils.DbUtils;
-
-import javax.enterprise.context.ApplicationScoped;
-
 
 /**
- * Service for database
+ * Service for database.
  */
 @ApplicationScoped
 public class DatabaseServiceImpl implements DatabaseService {
 
-    private final static String databaseConnectionOpenMsg = "Database connection is open.";
-    private final static String databaseConnectionCloseMsg = "Database connection is closed.";
     private final Logger log = LoggerFactory.getLogger(DatabaseServiceImpl.class);
     private final PgPool dbClient;
 
-    public DatabaseServiceImpl(DatabaseConfig databaseConfigs, Vertx vertx) {
-        this.dbClient = DbUtils.createDbClient(vertx, databaseConfigs);
-        log.debug(databaseConnectionOpenMsg);
-    }
-
     /**
-     * Gets the database client instance.
+     * Creates a new DatabaseServiceImpl.
      *
-     * @return The database client
+     * @param databaseConfigs The database configs
+     * @param vertx           The quarkus Vertx instance
      */
+    public DatabaseServiceImpl(final DatabaseConfig databaseConfigs, final Vertx vertx) {
+        this.dbClient = DbUtils.createDbClient(vertx, databaseConfigs);
+        log.debug("Database connection is open.");
+    }
+
+    @Override
     public PgPool getDbClient() {
         return dbClient;
     }
 
-    /**
-     * Close database connection
-     */
+    @Override
     public void close() {
         if (this.dbClient != null) {
             this.dbClient.close();
-            log.info(databaseConnectionCloseMsg);
+            log.info("Database connection is closed.");
         }
     }
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java
index 4716b0a0..316d47b5 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandService.java
@@ -19,8 +19,14 @@
 import io.vertx.ext.web.RoutingContext;
 
 /**
- * Device commands interface
+ * Device commands interface.
  */
 public interface DeviceCommandService {
+
+    /**
+     * Post device command.
+     *
+     * @param routingContext The RoutingContext
+     */
     void postCommand(RoutingContext routingContext);
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
index f3d40fdd..a8d2709c 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceCommandServiceImpl.java
@@ -16,26 +16,23 @@
 
 package org.eclipse.hono.communication.api.service;
 
-import io.vertx.ext.web.RoutingContext;
+import javax.enterprise.context.ApplicationScoped;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.enterprise.context.ApplicationScoped;
+import io.vertx.ext.web.RoutingContext;
 
 /**
- * Service for device commands
+ * Service for device commands.
  */
 @ApplicationScoped
 public class DeviceCommandServiceImpl implements DeviceCommandService {
     private final Logger log = LoggerFactory.getLogger(DeviceCommandServiceImpl.class);
 
 
-    /**
-     * Handles device post commands
-     *
-     * @param routingContext The routing context
-     */
-    public void postCommand(RoutingContext routingContext) {
+    @Override
+    public void postCommand(final RoutingContext routingContext) {
         // TODO publish command and send response
         log.info("postCommand received");
         routingContext.response().setStatusCode(501).end();
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
index e1870f84..cf282858 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigService.java
@@ -16,17 +16,34 @@
 
 package org.eclipse.hono.communication.api.service;
 
-import io.vertx.core.Future;
+
+import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 
+import io.vertx.core.Future;
 /**
- * Device config interface
+ * Device config interface.
  */
 public interface DeviceConfigService {
 
-    Future<DeviceConfigResponse> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId);
+    /**
+     * Create a new device config and send it to the device.
+     *
+     * @param deviceConfig The device config
+     * @param deviceId     The device id
+     * @param tenantId     The tenant id
+     * @return Future of DeviceConfig
+     */
+    Future<DeviceConfig> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId);
 
+    /**
+     * Lists all the configuration for a specific device.
+     *
+     * @param deviceId Device Id
+     * @param tenantId Tenant Id
+     * @param limit    Limit between 1 and 10
+     * @return Future of ListDeviceConfigVersionsResponse
+     */
     Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit);
 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
index f2d33012..a8abca20 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImpl.java
@@ -16,19 +16,18 @@
 
 package org.eclipse.hono.communication.api.service;
 
+import javax.enterprise.context.ApplicationScoped;
 
-import io.vertx.core.Future;
+import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.mapper.DeviceConfigMapper;
 import org.eclipse.hono.communication.api.repository.DeviceConfigsRepository;
 
-import javax.enterprise.context.ApplicationScoped;
-
+import io.vertx.core.Future;
 
 /**
- * Service for device commands
+ * Service for device commands.
  */
 
 @ApplicationScoped
@@ -38,33 +37,43 @@ public class DeviceConfigServiceImpl implements DeviceConfigService {
     private final DatabaseService db;
     private final DeviceConfigMapper mapper;
 
-    public DeviceConfigServiceImpl(DeviceConfigsRepository repository,
-                                   DatabaseService db,
-                                   DeviceConfigMapper mapper) {
+    /**
+     * Creates a new DeviceConfigServiceImpl with all dependencies.
+     *
+     * @param repository The DeviceConfigsRepository
+     * @param db         The database service
+     * @param mapper     The DeviceConfigMapper
+     */
+    public DeviceConfigServiceImpl(final DeviceConfigsRepository repository,
+                                   final DatabaseService db,
+                                   final DeviceConfigMapper mapper) {
 
         this.repository = repository;
         this.db = db;
         this.mapper = mapper;
     }
 
-    public Future<DeviceConfigResponse> modifyCloudToDeviceConfig(DeviceConfigRequest deviceConfig, String deviceId, String tenantId) {
+    @Override
+    public Future<DeviceConfig> modifyCloudToDeviceConfig(final DeviceConfigRequest deviceConfig, final String deviceId, final String tenantId) {
 
-        var entity = mapper.configRequestToDeviceConfigEntity(deviceConfig);
+        final var entity = mapper.configRequestToDeviceConfigEntity(deviceConfig);
         entity.setDeviceId(deviceId);
         entity.setTenantId(tenantId);
 
         return db.getDbClient().withTransaction(
                         sqlConnection ->
                                 repository.createNew(sqlConnection, entity))
-                .map(mapper::deviceConfigEntityToResponse);
+                .map(mapper::deviceConfigEntityToConfig);
     }
 
-    public Future<ListDeviceConfigVersionsResponse> listAll(String deviceId, String tenantId, int limit) {
+
+    @Override
+    public Future<ListDeviceConfigVersionsResponse> listAll(final String deviceId, final String tenantId, final int limit) {
         return db.getDbClient().withConnection(
                 sqlConnection -> repository.listAll(sqlConnection, deviceId, tenantId, limit)
                         .map(
                                 result -> {
-                                    var listConfig = new ListDeviceConfigVersionsResponse();
+                                    final var listConfig = new ListDeviceConfigVersionsResponse();
                                     listConfig.setDeviceConfigs(result);
                                     return listConfig;
                                 }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java
index d062701e..f7909951 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/service/VertxHttpHandlerManagerService.java
@@ -16,25 +16,33 @@
 
 package org.eclipse.hono.communication.api.service;
 
-import org.eclipse.hono.communication.api.handler.DeviceCommandsHandler;
+import java.util.List;
+
+import javax.enterprise.context.ApplicationScoped;
+
+import org.eclipse.hono.communication.api.handler.DeviceCommandHandler;
 import org.eclipse.hono.communication.api.handler.DeviceConfigsHandler;
 import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
 
-import javax.enterprise.context.ApplicationScoped;
-import java.util.List;
 
 /**
- * Provides and Manages available HTTP vertx handlers
+ * Provides and Manages available HTTP vertx handlers.
  */
 @ApplicationScoped
 public class VertxHttpHandlerManagerService {
     /**
-     * Available vertx endpoints handler services
+     * Available vertx endpoints handler services.
      */
     private final List<HttpEndpointHandler> availableHandlerServices;
 
 
-    public VertxHttpHandlerManagerService(DeviceConfigsHandler configHandler, DeviceCommandsHandler commandHandler) {
+    /**
+     * Creates a new  VertxHttpHandlerManagerService with all dependencies.
+     *
+     * @param configHandler  The configuration handler
+     * @param commandHandler The command handler
+     */
+    public VertxHttpHandlerManagerService(final DeviceConfigsHandler configHandler, final DeviceCommandHandler commandHandler) {
         this.availableHandlerServices = List.of(configHandler, commandHandler);
     }
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
index 23a8d33e..d4b00d3d 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/AbstractServiceApplication.java
@@ -16,6 +16,16 @@
 
 package org.eclipse.hono.communication.core.app;
 
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+import javax.enterprise.event.Observes;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import io.quarkus.runtime.ShutdownEvent;
 import io.quarkus.runtime.StartupEvent;
 import io.vertx.core.Closeable;
@@ -23,35 +33,33 @@
 import io.vertx.core.impl.VertxInternal;
 import io.vertx.core.impl.cpu.CpuCoreSensor;
 import io.vertx.core.json.impl.JsonUtil;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import javax.enterprise.event.Observes;
-import java.util.Arrays;
-import java.util.Base64;
-import java.util.concurrent.CompletableFuture;
-import java.util.stream.Collectors;
 
 /**
- * Abstract Service application class
+ * Abstract Service application class.
  */
 public abstract class AbstractServiceApplication {
 
-    private final Logger log = LoggerFactory.getLogger(AbstractServiceApplication.class);
-
     /**
-     * The vert.x instance managed by Quarkus.
+     * YAML file application configurations properties.
      */
-    protected Vertx vertx;
+    protected final ApplicationConfig appConfigs;
     /**
-     * YAML file application configurations properties
+     * The vert.x instance managed by Quarkus.
      */
-    protected ApplicationConfig appConfigs;
+    protected final Vertx vertx;
+    private final Logger log = LoggerFactory.getLogger(AbstractServiceApplication.class);
     private Closeable addedVertxCloseHook;
 
 
+    /**
+     * Creates a new AbstractServiceApplication.
+     *
+     * @param vertx      The quarkus Vertx instance
+     * @param appConfigs The application configs
+     */
     public AbstractServiceApplication(final Vertx vertx,
-                                      ApplicationConfig appConfigs) {
+                                      final ApplicationConfig appConfigs) {
         this.vertx = vertx;
         this.appConfigs = appConfigs;
     }
@@ -78,7 +86,7 @@ protected void logJvmDetails() {
     }
 
     /**
-     * Registers a close hook that will be notified when the Vertx instance is being closed
+     * Registers a close hook that will be notified when the Vertx instance is being closed.
      */
     private void registerVertxCloseHook() {
         if (vertx instanceof VertxInternal vertxInternal) {
@@ -132,6 +140,9 @@ protected void doStart() {
         // do nothing
     }
 
+    /**
+     * Do work on application stop signal.
+     */
     protected void doStop() {
         // do nothing
     }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java
index 5fc2fde0..174204bf 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ApplicationConfig.java
@@ -16,29 +16,32 @@
 
 package org.eclipse.hono.communication.core.app;
 
-import org.eclipse.microprofile.config.inject.ConfigProperty;
-
 import javax.inject.Singleton;
 
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+
 
 /**
- * Application configurations
+ * Application configurations.
  */
 @Singleton
 public class ApplicationConfig {
 
-    private final ServerConfig serverConfig;
-    private final DatabaseConfig databaseConfig;
-
-    // Application
+    @ConfigProperty(name = "app.version")
+    String version;
     @ConfigProperty(name = "app.name")
     String componentName;
+    private final ServerConfig serverConfig;
+    private final DatabaseConfig databaseConfig;
 
 
-    @ConfigProperty(name = "app.version")
-    String version;
-
-    public ApplicationConfig(ServerConfig serverConfig, DatabaseConfig databaseConfig) {
+    /**
+     * Creates a new ApplicationConfig.
+     *
+     * @param serverConfig   The server configs
+     * @param databaseConfig The database configs
+     */
+    public ApplicationConfig(final ServerConfig serverConfig, final DatabaseConfig databaseConfig) {
         this.serverConfig = serverConfig;
         this.databaseConfig = databaseConfig;
     }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
index ff9c7208..0819106a 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/DatabaseConfig.java
@@ -16,12 +16,13 @@
 
 package org.eclipse.hono.communication.core.app;
 
+import javax.inject.Singleton;
+
 import org.eclipse.microprofile.config.inject.ConfigProperty;
 
-import javax.inject.Singleton;
 
 /**
- * Database configurations
+ * Database configurations.
  */
 @Singleton
 public class DatabaseConfig {
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
index a7fc4ef2..4c5ee60c 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/app/ServerConfig.java
@@ -16,12 +16,13 @@
 
 package org.eclipse.hono.communication.core.app;
 
+import javax.inject.Singleton;
+
 import org.eclipse.microprofile.config.inject.ConfigProperty;
 
-import javax.inject.Singleton;
 
 /**
- * Server configurations
+ * Server configurations.
  */
 @Singleton
 public class ServerConfig {
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java
index a0441fef..493f22af 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/AbstractVertxHttpServer.java
@@ -16,11 +16,13 @@
 
 package org.eclipse.hono.communication.core.http;
 
-import io.vertx.core.Vertx;
 import org.eclipse.hono.communication.core.app.ApplicationConfig;
 
+import io.vertx.core.Vertx;
+
+
 /**
- * Abstract class for creating HTTP server in quarkus
+ * Abstract class for creating HTTP server in quarkus.
  * using the managed vertx api
  */
 public abstract class AbstractVertxHttpServer {
@@ -28,7 +30,13 @@ public abstract class AbstractVertxHttpServer {
     protected final Vertx vertx;
 
 
-    public AbstractVertxHttpServer(ApplicationConfig appConfigs, Vertx vertx) {
+    /**
+     * Creates a new AbstractVertxHttpServer.
+     *
+     * @param appConfigs The application configs
+     * @param vertx      The quarkus Vertx instance
+     */
+    public AbstractVertxHttpServer(final ApplicationConfig appConfigs, final Vertx vertx) {
         this.appConfigs = appConfigs;
         this.vertx = vertx;
     }
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java
index cbfce4c4..3431c190 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServer.java
@@ -17,17 +17,17 @@
 package org.eclipse.hono.communication.core.http;
 
 /**
- * HTTP server service
+ * HTTP server service.
  */
 public interface HttpServer {
 
     /**
-     * Starts the http server
+     * Starts the http server.
      */
     void start();
 
     /**
-     * Stops the http server
+     * Stops the http server.
      */
     void stop();
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
index 8202b152..c0167c0a 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
@@ -16,14 +16,15 @@
 
 package org.eclipse.hono.communication.core.http;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.HashMap;
-import java.util.Map;
 
 /**
- * Base HTTP service class
+ * Base HTTP service class.
  */
 public class HttpServiceBase {
 
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
index 072b4dbc..2d21812d 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
@@ -16,30 +16,37 @@
 
 package org.eclipse.hono.communication.core.utils;
 
+import org.eclipse.hono.communication.core.app.DatabaseConfig;
+
 import io.vertx.core.Vertx;
 import io.vertx.core.impl.logging.Logger;
 import io.vertx.core.impl.logging.LoggerFactory;
 import io.vertx.pgclient.PgConnectOptions;
 import io.vertx.pgclient.PgPool;
 import io.vertx.sqlclient.PoolOptions;
-import org.eclipse.hono.communication.core.app.DatabaseConfig;
+
 
 /**
- * Database utilities class
+ * Database utilities class.
  */
-public class DbUtils {
+public final class DbUtils {
+
+    static final Logger log = LoggerFactory.getLogger(DbUtils.class);
+    static final String connectionFailedMsg = "Failed to connect to Database: %s";
+    static final String connectionSuccessMsg = "Database connection created successfully.";
 
-    final static Logger log = LoggerFactory.getLogger(DbUtils.class);
-    final static String connectionFailedMsg = "Failed to connect to Database: %s";
-    final static String connectionSuccessMsg = "Database connection created successfully.";
+    private DbUtils() {
+        // avoid instantiation
+    }
 
     /**
-     * Build DB client that is used to manage a pool of connections
+     * Build DB client that is used to manage a pool of connections.
      *
-     * @param vertx Vertx context
+     * @param vertx     The quarkus Vertx instance
+     * @param dbConfigs The database configs
      * @return PostgreSQL pool
      */
-    public static PgPool createDbClient(Vertx vertx, DatabaseConfig dbConfigs) {
+    public static PgPool createDbClient(final Vertx vertx, final DatabaseConfig dbConfigs) {
 
 
         final PgConnectOptions connectOptions = new PgConnectOptions()
@@ -50,7 +57,7 @@ public static PgPool createDbClient(Vertx vertx, DatabaseConfig dbConfigs) {
                 .setPassword(dbConfigs.getPassword());
 
         final PoolOptions poolOptions = new PoolOptions().setMaxSize(dbConfigs.getPoolMaxSize());
-        var pool = PgPool.pool(vertx, connectOptions, poolOptions);
+        final var pool = PgPool.pool(vertx, connectOptions, poolOptions);
         pool.getConnection(connection -> {
             if (connection.failed()) {
                 log.error(String.format(connectionFailedMsg, connection.cause().getMessage()));
diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
index a37b6b18..f53db74a 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/ResponseUtils.java
@@ -16,22 +16,33 @@
 
 package org.eclipse.hono.communication.core.utils;
 
+import org.eclipse.hono.communication.api.exception.DeviceNotFoundException;
+
 import io.vertx.core.json.Json;
 import io.vertx.core.json.JsonObject;
 import io.vertx.ext.web.RoutingContext;
 import io.vertx.ext.web.validation.BadRequestException;
-import org.eclipse.hono.communication.api.exception.DeviceNotFoundException;
+
 
 /**
- * HTTP Response utilities class
+ * HTTP Response utilities class.
  */
 public abstract class ResponseUtils {
     private static final String CONTENT_TYPE_HEADER = "Content-Type";
     private static final String APPLICATION_JSON_TYPE = "application/json";
 
+    private ResponseUtils() {
+        // avoid instantiation
+    }
 
-    public static void successResponse(RoutingContext rc,
-                                       Object response) {
+    /**
+     * Build success response using 200 as its status code and response object as body.
+     *
+     * @param rc       The routing context
+     * @param response The response object
+     */
+    public static void successResponse(final RoutingContext rc,
+                                       final Object response) {
         rc.response()
                 .setStatusCode(200)
                 .putHeader(CONTENT_TYPE_HEADER, APPLICATION_JSON_TYPE)
@@ -39,13 +50,13 @@ public static void successResponse(RoutingContext rc,
     }
 
     /**
-     * Build success response using 201 Created as its status code and response as its body
+     * Build success response using 201 Created as its status code and response  object as body.
      *
      * @param rc       Routing context
      * @param response Response body
      */
-    public static void createdResponse(RoutingContext rc,
-                                       Object response) {
+    public static void createdResponse(final RoutingContext rc,
+                                       final Object response) {
         rc.response()
                 .setStatusCode(201)
                 .putHeader(CONTENT_TYPE_HEADER, APPLICATION_JSON_TYPE)
@@ -53,11 +64,11 @@ public static void createdResponse(RoutingContext rc,
     }
 
     /**
-     * Build success response using 204 No Content as its status code and no body
+     * Build success response using 204 No Content as its status code and no response body.
      *
      * @param rc Routing context
      */
-    public static void noContentResponse(RoutingContext rc) {
+    public static void noContentResponse(final RoutingContext rc) {
         rc.response()
                 .setStatusCode(204)
                 .end();
@@ -65,12 +76,12 @@ public static void noContentResponse(RoutingContext rc) {
 
     /**
      * Build error response using 400 Bad Request, 404 Not Found or 500 Internal Server Error
-     * as its status code and throwable as its body
+     * as its status code and throwable as its body.
      *
      * @param rc    Routing context
      * @param error Throwable exception
      */
-    public static void errorResponse(RoutingContext rc, Throwable error) {
+    public static void errorResponse(final RoutingContext rc, final Throwable error) {
         final int status;
         final String message;
 
diff --git a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
index 20aa6466..63764c51 100644
--- a/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
+++ b/device-communication/src/main/resources/api/hono-device-communication-v1.yaml
@@ -97,7 +97,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/DeviceConfigResponse'
+                $ref: '#/components/schemas/DeviceConfig'
           description: Device config updated successfully
         "400":
           description: Validation error or Bad request
@@ -171,9 +171,9 @@ components:
             $ref: '#/components/schemas/DeviceConfig'
       example:
         deviceConfigs:
-          - object: DeviceConfigResponse
+          - object: DeviceConfig
     DeviceConfig:
-      title: Root Type for DeviceConfigResponse
+      title: Root Type for DeviceConfig
       description: The device configuration.
       type: object
       properties:
@@ -213,30 +213,3 @@ components:
         cloudUpdateTime: string
         deviceAckTime: string
         binaryData: string
-    DeviceConfigResponse:
-      title: New Config version response
-      description: The device configuration.
-      type: object
-      properties:
-        version:
-          description: "String (int64 format) [Output only] The version
-            of this update. The version number is assigned by the server, and is
-            always greater than 0 after device creation. The version must be 0 on
-            the devices.create request if a config is specified; the response of
-            devices.create will always have a value of 1."
-          type: string
-        cloudUpdateTime:
-          description: "String (Timestamp format) [Output only] The time at
-            which this configuration version was updated in Cloud IoT Core. This
-            timestamp is set by the server. Timestamp in 
-            RFC3339 UTC \"Zulu\" format, accurate to nanoseconds. 
-            Example: \"2014-10-02T15:01:23.045123456Z\"."
-          type: string
-        binaryData:
-          description: "string (bytes format) The device configuration data
-            in string base64-encoded format."
-          type: string
-      example:
-        version: string
-        cloudUpdateTime: string
-        binaryData: string
diff --git a/device-communication/src/main/resources/api/hono-endpoint.yaml b/device-communication/src/main/resources/api/hono-endpoint.yaml
index e8c29a34..e2e1491b 100644
--- a/device-communication/src/main/resources/api/hono-endpoint.yaml
+++ b/device-communication/src/main/resources/api/hono-endpoint.yaml
@@ -73,7 +73,7 @@ definitions:
           request if a config is specified; the response of devices.create will
           always have a value of 1.
         type: string
-    title: Root Type for DeviceConfigResponse
+    title: Root Type for DeviceConfig
     type: object
   DeviceConfigRequest:
     description: Request body for modifying device configs
@@ -87,40 +87,12 @@ definitions:
     required:
       - binaryData
     type: object
-  DeviceConfigResponse:
-    description: The device configuration.
-    example:
-      binaryData: string
-      cloudUpdateTime: string
-      version: string
-    properties:
-      binaryData:
-        description: >-
-          string (bytes format) The device configuration data in string
-          base64-encoded format.
-        type: string
-      cloudUpdateTime:
-        description: >-
-          String (Timestamp format) [Output only] The time at which this
-          configuration version was updated in Cloud IoT Core. This timestamp is
-          set by the server. Timestamp in  RFC3339 UTC "Zulu" format, accurate
-          to nanoseconds.  Example: "2014-10-02T15:01:23.045123456Z".
-        type: string
-      version:
-        description: >-
-          String (int64 format) [Output only] The version of this update. The
-          version number is assigned by the server, and is always greater than 0
-          after device creation. The version must be 0 on the devices.create
-          request if a config is specified; the response of devices.create will
-          always have a value of 1.
-        type: string
-    title: New Config version response
-    type: object
+
   ListDeviceConfigVersionsResponse:
     description: A list of a device config versions
     example:
       deviceConfigs:
-        - object: DeviceConfigResponse
+        - object: DeviceConfig
     properties:
       deviceConfigs:
         description: List of DeviceConfig objects
@@ -221,7 +193,7 @@ paths:
         "200":
           description: Device config updated successfully
           schema:
-            $ref: "#/definitions/DeviceConfigResponse"
+            $ref: "#/definitions/DeviceConfig"
         "400":
           description: Validation error or Bad request
         "404":
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java
index 53425a75..c45b74ed 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/ApplicationTest.java
@@ -16,14 +16,21 @@
 
 package org.eclipse.hono.communication.api;
 
-import io.vertx.core.Vertx;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
 import org.eclipse.hono.communication.core.app.ApplicationConfig;
 import org.eclipse.hono.communication.core.http.HttpServer;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import static org.mockito.Mockito.*;
+
+import io.vertx.core.Vertx;
+
 
 class ApplicationTest {
 
@@ -33,8 +40,8 @@ class ApplicationTest {
     @BeforeEach
     void setUp() {
         httpServerMock = mock(HttpServer.class);
-        Vertx vertxMock = mock(Vertx.class);
-        ApplicationConfig appConfigs = mock(ApplicationConfig.class);
+        final Vertx vertxMock = mock(Vertx.class);
+        final ApplicationConfig appConfigs = mock(ApplicationConfig.class);
         application = new Application(vertxMock, appConfigs, httpServerMock);
 
         verifyNoMoreInteractions(httpServerMock, appConfigs, vertxMock);
@@ -53,4 +60,4 @@ void doStart() {
         verify(httpServerMock, times(1)).start();
 
     }
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
index b7ddf227..c25a29db 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServerTest.java
@@ -16,32 +16,42 @@
 
 package org.eclipse.hono.communication.api;
 
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+
+import java.util.List;
+
+import org.eclipse.hono.communication.api.handler.DeviceCommandHandler;
+import org.eclipse.hono.communication.api.service.DatabaseSchemaCreator;
+import org.eclipse.hono.communication.api.service.DatabaseSchemaCreatorImpl;
+import org.eclipse.hono.communication.api.service.DatabaseService;
+import org.eclipse.hono.communication.api.service.DatabaseServiceImpl;
+import org.eclipse.hono.communication.api.service.VertxHttpHandlerManagerService;
+import org.eclipse.hono.communication.core.app.ApplicationConfig;
+import org.eclipse.hono.communication.core.app.ServerConfig;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
 
 import io.netty.handler.codec.http.HttpHeaderNames;
 import io.quarkus.runtime.Quarkus;
 import io.vertx.core.Future;
 import io.vertx.core.Vertx;
-import io.vertx.core.http.*;
+import io.vertx.core.http.HttpMethod;
+import io.vertx.core.http.HttpServer;
+import io.vertx.core.http.HttpServerOptions;
+import io.vertx.core.http.HttpServerRequest;
+import io.vertx.core.http.HttpServerResponse;
 import io.vertx.core.json.JsonObject;
 import io.vertx.ext.web.Route;
 import io.vertx.ext.web.Router;
 import io.vertx.ext.web.RoutingContext;
 import io.vertx.ext.web.openapi.RouterBuilder;
 import io.vertx.ext.web.validation.BadRequestException;
-import org.eclipse.hono.communication.api.handler.DeviceCommandsHandler;
-import org.eclipse.hono.communication.api.service.*;
-import org.eclipse.hono.communication.core.app.ApplicationConfig;
-import org.eclipse.hono.communication.core.app.ServerConfig;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.mockito.MockedStatic;
-import org.mockito.Mockito;
-
-import java.util.List;
 
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.*;
 
 class DeviceCommunicationHttpServerTest {
 
@@ -111,7 +121,7 @@ void tearDown() {
 
     @Test
     void startSucceeded() {
-        var mockedCommandService = mock(DeviceCommandsHandler.class);
+        final var mockedCommandService = mock(DeviceCommandHandler.class);
         Mockito.verifyNoMoreInteractions(mockedCommandService);
         doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
         try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
@@ -138,7 +148,7 @@ void startSucceeded() {
                 when(routerMock.route(any())).thenReturn(routeMock);
 
                 try (MockedStatic<Quarkus> quarkusMockedStatic = mockStatic(Quarkus.class)) {
-                    DeviceCommunicationHttpServer deviceCommunicationHttpServerSpy = spy(this.deviceCommunicationHttpServer);
+                    final DeviceCommunicationHttpServer deviceCommunicationHttpServerSpy = spy(this.deviceCommunicationHttpServer);
                     deviceCommunicationHttpServerSpy.start();
 
 
@@ -186,7 +196,7 @@ void startSucceeded() {
 
     @Test
     void createRouterFailed() {
-        var mockedCommandService = mock(DeviceCommandsHandler.class);
+        final var mockedCommandService = mock(DeviceCommandHandler.class);
         Mockito.verifyNoMoreInteractions(mockedCommandService);
         doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
         try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
@@ -216,7 +226,7 @@ void createRouterFailed() {
 
     @Test
     void createServerFailed() {
-        var mockedCommandService = mock(DeviceCommandsHandler.class);
+        final var mockedCommandService = mock(DeviceCommandHandler.class);
         Mockito.verifyNoMoreInteractions(mockedCommandService);
         doNothing().when(mockedCommandService).addRoutes(this.routerBuilderMock);
         try (MockedStatic<RouterBuilder> mockedRouterBuilderStatic = mockStatic(RouterBuilder.class)) {
@@ -241,13 +251,13 @@ void createServerFailed() {
                     when(serverConfigMock.getOpenApiFilePath()).thenReturn("/myPath");
                     when(serverConfigMock.getBasePath()).thenReturn("/basePath");
                     when(routerMock.route(any())).thenReturn(routeMock);
-                    DeviceCommunicationHttpServer deviceCommunicationHttpServerSpy = spy(this.deviceCommunicationHttpServer);
+                    final DeviceCommunicationHttpServer deviceCommunicationHttpServerSpy = spy(this.deviceCommunicationHttpServer);
                     deviceCommunicationHttpServerSpy.start();
 
 
                     verify(deviceCommunicationHttpServerSpy, times(1)).createRouterWithEndpoints(eq(routerBuilderMock), any());
                     verify(deviceCommunicationHttpServerSpy, times(1)).startVertxServer(any());
-                   
+
 
                     mockedRouterBuilderStatic.verify(() -> RouterBuilder.create(vertxMock, "/myPath"), times(1));
 
@@ -284,8 +294,8 @@ void createServerFailed() {
 
     @Test
     void addDefault400ExceptionHandler() {
-        var errorMsg = "This is an error message";
-        int code = 400;
+        final var errorMsg = "This is an error message";
+        final int code = 400;
 
         when(routingContextMock.failure()).thenReturn(badRequestExceptionMock);
         when(badRequestExceptionMock.toJson()).thenReturn(jsonObjMock);
@@ -307,8 +317,8 @@ void addDefault400ExceptionHandler() {
     @Test
     void addDefault404ExceptionHandlerPutsHeader() {
 
-        var errorMsg = "This is an error message";
-        int code = 404;
+        final var errorMsg = "This is an error message";
+        final int code = 404;
 
         when(routingContextMock.response()).thenReturn(httpServerResponseMock);
         when(httpServerResponseMock.putHeader(eq(HttpHeaderNames.CONTENT_TYPE),
@@ -352,8 +362,8 @@ void addDefault404ExceptionHandlerResponseEnded() {
     @Test
     void addDefault404ExceptionHandlerMethodEqualsHead() {
 
-        var errorMsg = "This is an error message";
-        int code = 404;
+        final var errorMsg = "This is an error message";
+        final int code = 404;
 
         when(routingContextMock.response()).thenReturn(httpServerResponseMock);
         when(httpServerResponseMock.ended()).thenReturn(Boolean.FALSE);
@@ -383,4 +393,4 @@ void stop() {
         deviceCommunicationHttpServer.stop();
         verify(dbMock).close();
     }
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java
index ee96c36a..533259d2 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceCommandsHandlerTest.java
@@ -16,9 +16,9 @@
 
 package org.eclipse.hono.communication.api.handler;
 
-import io.vertx.ext.web.RoutingContext;
-import io.vertx.ext.web.openapi.Operation;
-import io.vertx.ext.web.openapi.RouterBuilder;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
 import org.eclipse.hono.communication.api.config.DeviceCommandConstants;
 import org.eclipse.hono.communication.api.service.DeviceCommandService;
 import org.eclipse.hono.communication.api.service.DeviceCommandServiceImpl;
@@ -26,8 +26,10 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.*;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.Operation;
+import io.vertx.ext.web.openapi.RouterBuilder;
+
 
 class DeviceCommandsHandlerTest {
 
@@ -35,14 +37,14 @@ class DeviceCommandsHandlerTest {
     private final RouterBuilder routerBuilderMock;
     private final RoutingContext routingContextMock;
     private final Operation operationMock;
-    private final DeviceCommandsHandler deviceCommandsHandler;
+    private final DeviceCommandHandler deviceCommandsHandler;
 
-    public DeviceCommandsHandlerTest() {
+    DeviceCommandsHandlerTest() {
         operationMock = mock(Operation.class);
         commandServiceMock = mock(DeviceCommandServiceImpl.class);
         routerBuilderMock = mock(RouterBuilder.class);
         routingContextMock = mock(RoutingContext.class);
-        deviceCommandsHandler = new DeviceCommandsHandler(commandServiceMock);
+        deviceCommandsHandler = new DeviceCommandHandler(commandServiceMock);
     }
 
     @AfterEach
@@ -85,5 +87,4 @@ void handlePostCommand() {
         verify(commandServiceMock, times(1)).postCommand(routingContextMock);
     }
 
-
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
index 081a71f1..e1a65770 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/handler/DeviceConfigsHandlerTest.java
@@ -16,19 +16,15 @@
 
 package org.eclipse.hono.communication.api.handler;
 
-import io.vertx.core.Future;
-import io.vertx.core.MultiMap;
-import io.vertx.core.http.HttpServerResponse;
-import io.vertx.core.json.Json;
-import io.vertx.core.json.JsonObject;
-import io.vertx.ext.web.RequestBody;
-import io.vertx.ext.web.RoutingContext;
-import io.vertx.ext.web.openapi.Operation;
-import io.vertx.ext.web.openapi.RouterBuilder;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+import java.util.List;
+
 import org.eclipse.hono.communication.api.config.DeviceConfigsConstants;
 import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.service.DeviceConfigService;
 import org.eclipse.hono.communication.api.service.DeviceConfigServiceImpl;
@@ -37,11 +33,16 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.util.List;
+import io.vertx.core.Future;
+import io.vertx.core.MultiMap;
+import io.vertx.core.http.HttpServerResponse;
+import io.vertx.core.json.Json;
+import io.vertx.core.json.JsonObject;
+import io.vertx.ext.web.RequestBody;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.openapi.Operation;
+import io.vertx.ext.web.openapi.RouterBuilder;
 
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.*;
 
 class DeviceConfigsHandlerTest {
 
@@ -58,11 +59,11 @@ class DeviceConfigsHandlerTest {
     private final String tenantID = "tenant_ID";
     private final String deviceID = "device_ID";
     private final String errorMsg = "test_error";
-    DeviceConfigRequest deviceConfigRequest = new DeviceConfigRequest("1", "binary_data");
-    DeviceConfigResponse deviceConfigEntity = new DeviceConfigResponse();
-    DeviceConfig deviceConfig = new DeviceConfig();
+    private final DeviceConfigRequest deviceConfigRequest = new DeviceConfigRequest("1", "binary_data");
+    private final DeviceConfig deviceConfigEntity = new DeviceConfig();
+    private final DeviceConfig deviceConfig = new DeviceConfig();
 
-    public DeviceConfigsHandlerTest() {
+    DeviceConfigsHandlerTest() {
         operationMock = mock(Operation.class);
         configServiceMock = mock(DeviceConfigServiceImpl.class);
         routerBuilderMock = mock(RouterBuilder.class);
@@ -73,7 +74,7 @@ public DeviceConfigsHandlerTest() {
         illegalArgumentExceptionMock = mock(IllegalArgumentException.class);
         deviceConfigsHandler = new DeviceConfigsHandler(configServiceMock);
 
-        deviceConfigEntity.setVersion(1);
+        deviceConfigEntity.setVersion("1");
 
 
         deviceConfig.setVersion("");
@@ -123,7 +124,7 @@ void handleModifyCloudToDeviceConfig_success() {
         when(httpServerResponseMock.putHeader("Content-Type",
                 "application/json")).thenReturn(httpServerResponseMock);
 
-        var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
+        final var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
 
         verify(configServiceMock).modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID);
         verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
@@ -150,7 +151,7 @@ void handleModifyCloudToDeviceConfig_failure() {
         when(httpServerResponseMock.putHeader("Content-Type",
                 "application/json")).thenReturn(httpServerResponseMock);
 
-        var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
+        final var results = deviceConfigsHandler.handleModifyCloudToDeviceConfig(routingContextMock);
 
         verify(configServiceMock).modifyCloudToDeviceConfig(deviceConfigRequest, deviceID, tenantID);
         verify(routingContextMock, times(1)).pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS);
@@ -167,8 +168,8 @@ void handleModifyCloudToDeviceConfig_failure() {
 
     @Test
     void handleListConfigVersions_success() {
-        ListDeviceConfigVersionsResponse listDeviceConfigVersionsResponse = new ListDeviceConfigVersionsResponse(List.of(deviceConfig));
-        MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
+        final var listDeviceConfigVersionsResponse = new ListDeviceConfigVersionsResponse(List.of(deviceConfig));
+        final MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
         when(routingContextMock.queryParams()).thenReturn(queryParams);
         when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS)).thenReturn(tenantID);
         when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS)).thenReturn(deviceID);
@@ -178,7 +179,7 @@ void handleListConfigVersions_success() {
                 "application/json")).thenReturn(httpServerResponseMock);
         when(configServiceMock.listAll(deviceID, tenantID, 10)).thenReturn(Future.succeededFuture(listDeviceConfigVersionsResponse));
 
-        var results = deviceConfigsHandler.handleListConfigVersions(routingContextMock);
+        final var results = deviceConfigsHandler.handleListConfigVersions(routingContextMock);
 
         verify(configServiceMock, times(1)).listAll(deviceID, tenantID, 10);
         verify(routingContextMock, times(1)).queryParams();
@@ -192,7 +193,7 @@ void handleListConfigVersions_success() {
 
     @Test
     void handleListConfigVersions_failed() {
-        MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
+        final MultiMap queryParams = MultiMap.caseInsensitiveMultiMap().add(DeviceConfigsConstants.NUM_VERSION_QUERY_PARAMS, String.valueOf(10));
         when(routingContextMock.queryParams()).thenReturn(queryParams);
         when(routingContextMock.pathParam(DeviceConfigsConstants.TENANT_PATH_PARAMS)).thenReturn(tenantID);
         when(routingContextMock.pathParam(DeviceConfigsConstants.DEVICE_PATH_PARAMS)).thenReturn(deviceID);
@@ -203,7 +204,7 @@ void handleListConfigVersions_failed() {
                 "application/json")).thenReturn(httpServerResponseMock);
         when(configServiceMock.listAll(deviceID, tenantID, 10)).thenReturn(Future.failedFuture(illegalArgumentExceptionMock));
 
-        var results = deviceConfigsHandler.handleListConfigVersions(routingContextMock);
+        final var results = deviceConfigsHandler.handleListConfigVersions(routingContextMock);
 
         verify(configServiceMock, times(1)).listAll(deviceID, tenantID, 10);
         verify(routingContextMock, times(1)).queryParams();
@@ -216,7 +217,7 @@ void handleListConfigVersions_failed() {
     }
 
 
-    void verifyErrorResponse(Future results) {
+    void verifyErrorResponse(final Future results) {
         verify(routingContextMock, times(1)).response();
         verify(httpServerResponseMock).setStatusCode(400);
         verify(illegalArgumentExceptionMock).getMessage();
@@ -226,7 +227,7 @@ void verifyErrorResponse(Future results) {
         Assertions.assertTrue(results.failed());
     }
 
-    void verifySuccessResponse(Future results, Object responseObj) {
+    void verifySuccessResponse(final Future results, final Object responseObj) {
         verify(routingContextMock, times(1)).response();
         verify(httpServerResponseMock).setStatusCode(200);
         verify(httpServerResponseMock).putHeader("Content-Type",
@@ -234,4 +235,4 @@ void verifySuccessResponse(Future results, Object responseObj) {
         verify(httpServerResponseMock).end(Json.encodePrettily(responseObj));
         Assertions.assertTrue(results.succeeded());
     }
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java
index 8b818edc..24c9cb8d 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseSchemaCreatorImplTest.java
@@ -16,17 +16,19 @@
 
 package org.eclipse.hono.communication.api.service;
 
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
 import io.vertx.core.Future;
 import io.vertx.core.Vertx;
 import io.vertx.core.file.FileSystem;
 import io.vertx.pgclient.PgPool;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
 
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.*;
 
 class DatabaseSchemaCreatorImplTest {
 
@@ -88,4 +90,4 @@ void createDBTables_failed() {
         verify(pgPoolMock).withTransaction(any());
 
     }
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
index 33025dbd..886c2259 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DatabaseServiceImplTest.java
@@ -16,8 +16,8 @@
 
 package org.eclipse.hono.communication.api.service;
 
-import io.vertx.core.Vertx;
-import io.vertx.pgclient.PgPool;
+import static org.mockito.Mockito.*;
+
 import org.eclipse.hono.communication.core.app.DatabaseConfig;
 import org.eclipse.hono.communication.core.utils.DbUtils;
 import org.junit.jupiter.api.AfterEach;
@@ -25,7 +25,9 @@
 import org.junit.jupiter.api.Test;
 import org.mockito.MockedStatic;
 
-import static org.mockito.Mockito.*;
+import io.vertx.core.Vertx;
+import io.vertx.pgclient.PgPool;
+
 
 class DatabaseServiceImplTest {
 
@@ -35,7 +37,7 @@ class DatabaseServiceImplTest {
     private final PgPool pgPoolMock;
     private DatabaseService databaseService;
 
-    public DatabaseServiceImplTest() {
+    DatabaseServiceImplTest() {
         vertxMock = mock(Vertx.class);
         databaseConfigMock = mock(DatabaseConfig.class);
         pgPoolMock = mock(PgPool.class);
@@ -56,7 +58,7 @@ void getDbClient() {
             dbUtilsMockedStatic.when(() -> DbUtils.createDbClient(vertxMock, databaseConfigMock)).thenReturn(pgPoolMock);
             databaseService = new DatabaseServiceImpl(databaseConfigMock, vertxMock);
 
-            var client = databaseService.getDbClient();
+            final var client = databaseService.getDbClient();
 
             Assertions.assertSame(client, pgPoolMock);
 
@@ -78,4 +80,4 @@ void close() {
             dbUtilsMockedStatic.verifyNoMoreInteractions();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
index a8099eb3..56b767fa 100644
--- a/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
+++ b/device-communication/src/test/java/org/eclipse/hono/communication/api/service/DeviceConfigServiceImplTest.java
@@ -16,11 +16,11 @@
 
 package org.eclipse.hono.communication.api.service;
 
-import io.vertx.core.Future;
-import io.vertx.pgclient.PgPool;
+import static org.mockito.Mockito.*;
+
+import org.eclipse.hono.communication.api.data.DeviceConfig;
 import org.eclipse.hono.communication.api.data.DeviceConfigEntity;
 import org.eclipse.hono.communication.api.data.DeviceConfigRequest;
-import org.eclipse.hono.communication.api.data.DeviceConfigResponse;
 import org.eclipse.hono.communication.api.data.ListDeviceConfigVersionsResponse;
 import org.eclipse.hono.communication.api.mapper.DeviceConfigMapper;
 import org.eclipse.hono.communication.api.repository.DeviceConfigsRepository;
@@ -29,7 +29,9 @@
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
-import static org.mockito.Mockito.*;
+import io.vertx.core.Future;
+import io.vertx.pgclient.PgPool;
+
 
 class DeviceConfigServiceImplTest {
 
@@ -42,7 +44,7 @@ class DeviceConfigServiceImplTest {
     private final String tenantId = "tenant_ID";
     private final String deviceId = "device_ID";
 
-    public DeviceConfigServiceImplTest() {
+    DeviceConfigServiceImplTest() {
         this.repositoryMock = mock(DeviceConfigsRepositoryImpl.class);
         this.dbMock = mock(DatabaseServiceImpl.class);
         this.mapperMock = mock(DeviceConfigMapper.class);
@@ -58,19 +60,19 @@ void tearDown() {
 
     @Test
     void modifyCloudToDeviceConfig_success() {
-        var deviceConfigRequest = new DeviceConfigRequest();
-        var deviceConfigEntity = new DeviceConfigEntity();
-        var deviceConfigEntityResponse = new DeviceConfigResponse();
+        final var deviceConfigRequest = new DeviceConfigRequest();
+        final var deviceConfigEntity = new DeviceConfigEntity();
+        final var deviceConfigEntityResponse = new DeviceConfig();
         when(mapperMock.configRequestToDeviceConfigEntity(deviceConfigRequest)).thenReturn(deviceConfigEntity);
-        when(mapperMock.deviceConfigEntityToResponse(deviceConfigEntity)).thenReturn(deviceConfigEntityResponse);
+        when(mapperMock.deviceConfigEntityToConfig(deviceConfigEntity)).thenReturn(deviceConfigEntityResponse);
         when(dbMock.getDbClient()).thenReturn(poolMock);
         when(poolMock.withTransaction(any())).thenReturn(Future.succeededFuture(deviceConfigEntity));
 
 
-        var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
+        final var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
 
         verify(mapperMock, times(1)).configRequestToDeviceConfigEntity(deviceConfigRequest);
-        verify(mapperMock, times(1)).deviceConfigEntityToResponse(deviceConfigEntity);
+        verify(mapperMock, times(1)).deviceConfigEntityToConfig(deviceConfigEntity);
         verify(dbMock, times(1)).getDbClient();
         verify(poolMock, times(1)).withTransaction(any());
         Assertions.assertTrue(results.succeeded());
@@ -78,14 +80,14 @@ void modifyCloudToDeviceConfig_success() {
 
     @Test
     void modifyCloudToDeviceConfig_failure() {
-        var deviceConfigRequest = new DeviceConfigRequest();
-        var deviceConfigEntity = new DeviceConfigEntity();
+        final var deviceConfigRequest = new DeviceConfigRequest();
+        final var deviceConfigEntity = new DeviceConfigEntity();
         when(mapperMock.configRequestToDeviceConfigEntity(deviceConfigRequest)).thenReturn(deviceConfigEntity);
         when(dbMock.getDbClient()).thenReturn(poolMock);
         when(poolMock.withTransaction(any())).thenReturn(Future.failedFuture(new Throwable("test_error")));
 
 
-        var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
+        final var results = deviceConfigService.modifyCloudToDeviceConfig(deviceConfigRequest, deviceId, tenantId);
 
         verify(mapperMock, times(1)).configRequestToDeviceConfigEntity(deviceConfigRequest);
         verify(dbMock, times(1)).getDbClient();
@@ -95,11 +97,11 @@ void modifyCloudToDeviceConfig_failure() {
 
     @Test
     void listAll_success() {
-        var deviceConfigVersions = new ListDeviceConfigVersionsResponse();
+        final var deviceConfigVersions = new ListDeviceConfigVersionsResponse();
         when(dbMock.getDbClient()).thenReturn(poolMock);
         when(poolMock.withConnection(any())).thenReturn(Future.succeededFuture(deviceConfigVersions));
 
-        var results = deviceConfigService.listAll(deviceId, tenantId, 10);
+        final var results = deviceConfigService.listAll(deviceId, tenantId, 10);
 
         verify(dbMock, times(1)).getDbClient();
         verify(poolMock, times(1)).withConnection(any());
@@ -114,7 +116,7 @@ void listAll_failed() {
         when(dbMock.getDbClient()).thenReturn(poolMock);
         when(poolMock.withConnection(any())).thenReturn(Future.failedFuture(new Throwable("test_error")));
 
-        var results = deviceConfigService.listAll(deviceId, tenantId, 10);
+        final var results = deviceConfigService.listAll(deviceId, tenantId, 10);
 
         verify(dbMock, times(1)).getDbClient();
         verify(poolMock, times(1)).withConnection(any());
@@ -122,4 +124,4 @@ void listAll_failed() {
 
 
     }
-}
\ No newline at end of file
+}

From 1edb541e78adee50538859934a0fbe86b5ed3d44 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Mon, 27 Feb 2023 13:41:41 +0100
Subject: [PATCH 07/18] replace System.exit with Quarkus.asyncExit

---
 .../org/eclipse/hono/communication/core/utils/DbUtils.java    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
index 2d21812d..45568ce2 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/core/utils/DbUtils.java
@@ -18,6 +18,7 @@
 
 import org.eclipse.hono.communication.core.app.DatabaseConfig;
 
+import io.quarkus.runtime.Quarkus;
 import io.vertx.core.Vertx;
 import io.vertx.core.impl.logging.Logger;
 import io.vertx.core.impl.logging.LoggerFactory;
@@ -61,8 +62,7 @@ public static PgPool createDbClient(final Vertx vertx, final DatabaseConfig dbCo
         pool.getConnection(connection -> {
             if (connection.failed()) {
                 log.error(String.format(connectionFailedMsg, connection.cause().getMessage()));
-                System.exit(-1);
-
+                Quarkus.asyncExit(-1);
             } else {
                 log.info(connectionSuccessMsg);
             }

From 2629393616fc23aa32d1cec75879a7f170cc97b4 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Mon, 27 Feb 2023 13:50:26 +0100
Subject: [PATCH 08/18] set default quarkus.container-image.push to false

---
 device-communication/src/main/resources/application.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/device-communication/src/main/resources/application.yaml b/device-communication/src/main/resources/application.yaml
index fea04fc8..0503a293 100644
--- a/device-communication/src/main/resources/application.yaml
+++ b/device-communication/src/main/resources/application.yaml
@@ -32,5 +32,5 @@ quarkus:
   container-image:
     builder: docker
     build: true
-    push: true
+    push: false
     image: "gcr.io/sotec-iot-core-dev/hono-device-communication"

From 2f72d02f3c03fa9460df9142a26f009daa079fbb Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 14 Mar 2023 15:07:48 +0100
Subject: [PATCH 09/18] remove class HttpServiceBase

---
 .../core/http/HttpServiceBase.java            | 35 -------------------
 1 file changed, 35 deletions(-)
 delete mode 100644 device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java b/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
deleted file mode 100644
index c0167c0a..00000000
--- a/device-communication/src/main/java/org/eclipse/hono/communication/core/http/HttpServiceBase.java
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * ***********************************************************
- *  Copyright (c) 2023 Contributors to the Eclipse Foundation
- *  <p>
- *  See the NOTICE file(s) distributed with this work for additional
- *  information regarding copyright ownership.
- *  <p>
- *  This program and the accompanying materials are made available under the
- *  terms of the Eclipse Public License 2.0 which is available at
- *  http://www.eclipse.org/legal/epl-2.0
- *  <p>
- *  SPDX-License-Identifier: EPL-2.0
- * **********************************************************
- *
- */
-
-package org.eclipse.hono.communication.core.http;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-
-/**
- * Base HTTP service class.
- */
-public class HttpServiceBase {
-
-    protected final Logger log = LoggerFactory.getLogger(getClass());
-    private final Map<String, HttpEndpointHandler> endpoints = new HashMap<>();
-
-
-}

From cdb2455a83411e1ddb4ed233114f6af416a71a01 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 14 Mar 2023 15:10:15 +0100
Subject: [PATCH 10/18] remove check style for auto generated mapper impl

---
 device-communication/pom.xml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/device-communication/pom.xml b/device-communication/pom.xml
index 23fa49a4..608b7c64 100644
--- a/device-communication/pom.xml
+++ b/device-communication/pom.xml
@@ -196,6 +196,10 @@
                     <configLocation>checkstyle/default.xml</configLocation>
                     <suppressionsLocation>checkstyle/suppressions.xml</suppressionsLocation>
                     <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                    <sourceDirectories>
+                        <sourceDirectory>${project.build.sourceDirectory}</sourceDirectory>
+                        <sourceDirectory>${project.build.testSourceDirectory}</sourceDirectory>
+                    </sourceDirectories>
                 </configuration>
             </plugin>
         </plugins>

From 562b26d4b18c9a35c417dbc8255b16ad741cdadf Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 14 Mar 2023 15:14:17 +0100
Subject: [PATCH 11/18] fix typo Throws to throws

---
 .../hono/communication/api/DeviceCommunicationHttpServer.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index 24e78682..6269b463 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -204,7 +204,7 @@ void startVertxServer(final Router router) {
      * Adds status code 400 and sets the error message for the routingContext response.
      *
      * @param routingContext the routing context object
-     * @Throws: NullPointerException – if routingContext is {@code null}.
+     * @throws: NullPointerException – if routingContext is {@code null}.
      */
     void addDefault400ExceptionHandler(final RoutingContext routingContext) {
         Objects.requireNonNull(routingContext);
@@ -217,7 +217,7 @@ void addDefault400ExceptionHandler(final RoutingContext routingContext) {
      * Adds status code 404 and sets the error message for the routingContext response.
      *
      * @param routingContext the routing context object
-     * @Throws: NullPointerException – if routingContext is {@code null}.
+     * @throws: NullPointerException – if routingContext is {@code null}.
      */
     void addDefault404ExceptionHandler(final RoutingContext routingContext) {
         Objects.requireNonNull(routingContext);

From 74de95e99dbdcad654a9302af518abe9078aed2b Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Mon, 27 Mar 2023 09:25:10 +0200
Subject: [PATCH 12/18] remove colon from java docs

---
 .../hono/communication/api/DeviceCommunicationHttpServer.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index 6269b463..aa7e004b 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -204,7 +204,7 @@ void startVertxServer(final Router router) {
      * Adds status code 400 and sets the error message for the routingContext response.
      *
      * @param routingContext the routing context object
-     * @throws: NullPointerException – if routingContext is {@code null}.
+     * @throws NullPointerException – if routingContext is {@code null}.
      */
     void addDefault400ExceptionHandler(final RoutingContext routingContext) {
         Objects.requireNonNull(routingContext);
@@ -217,7 +217,7 @@ void addDefault400ExceptionHandler(final RoutingContext routingContext) {
      * Adds status code 404 and sets the error message for the routingContext response.
      *
      * @param routingContext the routing context object
-     * @throws: NullPointerException – if routingContext is {@code null}.
+     * @throws NullPointerException – if routingContext is {@code null}.
      */
     void addDefault404ExceptionHandler(final RoutingContext routingContext) {
         Objects.requireNonNull(routingContext);

From 6e92b86c610c0880208ece72cf6024745849025f Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Mon, 3 Apr 2023 10:33:18 +0200
Subject: [PATCH 13/18] exclude quarkus-ide-launcher

---
 device-communication/pom.xml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/device-communication/pom.xml b/device-communication/pom.xml
index 608b7c64..16a757ab 100644
--- a/device-communication/pom.xml
+++ b/device-communication/pom.xml
@@ -34,6 +34,12 @@
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-arc</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>io.quarkus</groupId>
+                    <artifactId>quarkus-ide-launcher</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>

From 2b93c9227236167f3d04ba50528b001d8fd3c4de Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 25 Apr 2023 09:30:00 +0200
Subject: [PATCH 14/18] remove leading slash from openapi file

---
 device-communication/src/main/resources/application.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/device-communication/src/main/resources/application.yaml b/device-communication/src/main/resources/application.yaml
index 0503a293..1b15d64f 100644
--- a/device-communication/src/main/resources/application.yaml
+++ b/device-communication/src/main/resources/application.yaml
@@ -3,7 +3,7 @@ app:
   version: ${COM_APP_VERSION:"v1"}
 vertx:
   openapi:
-    file: ${COM_OPENAPI_FILE_PATH:/api/hono-device-communication-v1.yaml}
+    file: ${COM_OPENAPI_FILE_PATH:api/hono-device-communication-v1.yaml}
 
   server:
     url: ${COM_SERVER_HOST:0.0.0.0}

From 21af4149305876c5d4ad86a94ca90d910688b18b Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 25 Apr 2023 14:26:46 +0200
Subject: [PATCH 15/18] fix log error

---
 .../hono/communication/api/DeviceCommunicationHttpServer.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index aa7e004b..2e42fcd5 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -98,7 +98,7 @@ public void start() {
                 })
                 .onFailure(error -> {
                     if (error != null) {
-                        log.error(error.getMessage());
+                        log.error("Can not create Router {}", error.getMessage());
                     } else {
                         log.error("Can not create Router");
                     }

From 7e3ce102f3cb4a680e4907b07108f90ca9fcb8b8 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 25 Apr 2023 14:38:50 +0200
Subject: [PATCH 16/18] remove router error handlers

---
 .../communication/api/DeviceCommunicationHttpServer.java     | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
index 2e42fcd5..5cc13001 100644
--- a/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
+++ b/device-communication/src/main/java/org/eclipse/hono/communication/api/DeviceCommunicationHttpServer.java
@@ -30,7 +30,6 @@
 import org.eclipse.hono.communication.core.http.AbstractVertxHttpServer;
 import org.eclipse.hono.communication.core.http.HttpEndpointHandler;
 import org.eclipse.hono.communication.core.http.HttpServer;
-import org.eclipse.hono.communication.core.utils.ResponseUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -125,10 +124,6 @@ Router createRouterWithEndpoints(final RouterBuilder routerBuilder, final List<H
         }
         final var apiRouter = Router.router(vertx);
         final var router = routerBuilder.createRouter();
-        apiRouter.errorHandler(400, routingContext ->
-                ResponseUtils.errorResponse(routingContext, routingContext.failure()));
-        apiRouter.errorHandler(404, routingContext ->
-                ResponseUtils.errorResponse(routingContext, routingContext.failure()));
 
         final var serverConfig = appConfigs.getServerConfig();
         addHealthCheckHandlers(apiRouter, serverConfig);

From 733ad6973e3eccd0a19fe80074f4a2533fa1e375 Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 25 Apr 2023 14:43:49 +0200
Subject: [PATCH 17/18] add hint for post command

---
 device-communication/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/device-communication/README.md b/device-communication/README.md
index 681e5895..507b14ab 100644
--- a/device-communication/README.md
+++ b/device-communication/README.md
@@ -18,7 +18,7 @@ router.
 
 #### commands/{tenantId}/{deviceId}
 
-- POST : post a command for a specific device
+- POST : post a command for a specific device (NOT IMPLEMENTED YET)
 
 <p>
 

From 8c87c8011a3812c6817ff26ea350a635afd9d95d Mon Sep 17 00:00:00 2001
From: "g.dimitropoulos" <g.dimitropoulos@sotec.eu>
Date: Tue, 25 Apr 2023 15:01:13 +0200
Subject: [PATCH 18/18] make mvnw executable

---
 device-communication/mvnw | 1 +
 1 file changed, 1 insertion(+)

diff --git a/device-communication/mvnw b/device-communication/mvnw
index eaa3d308..b69732dc 100644
--- a/device-communication/mvnw
+++ b/device-communication/mvnw
@@ -314,3 +314,4 @@ exec "$JAVACMD" \
   "-Dmaven.home=${M2_HOME}" \
   "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
   ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
+