diff --git a/hardware_interface/CMakeLists.txt b/hardware_interface/CMakeLists.txt
index aba7c104da1..0342efe9a4f 100644
--- a/hardware_interface/CMakeLists.txt
+++ b/hardware_interface/CMakeLists.txt
@@ -80,6 +80,10 @@ if(BUILD_TESTING)
   target_link_libraries(test_component_interfaces_custom_export hardware_interface)
   ament_target_dependencies(test_component_interfaces_custom_export ros2_control_test_assets)
 
+  ament_add_gmock(test_error_warning_codes test/test_error_warning_codes.cpp)
+  target_link_libraries(test_error_warning_codes hardware_interface)
+  ament_target_dependencies(test_error_warning_codes ros2_control_test_assets)
+
   ament_add_gmock(test_component_parser test/test_component_parser.cpp)
   target_link_libraries(test_component_parser hardware_interface)
   ament_target_dependencies(test_component_parser ros2_control_test_assets)
diff --git a/hardware_interface/include/hardware_interface/actuator_interface.hpp b/hardware_interface/include/hardware_interface/actuator_interface.hpp
index 46369f94990..72544663577 100644
--- a/hardware_interface/include/hardware_interface/actuator_interface.hpp
+++ b/hardware_interface/include/hardware_interface/actuator_interface.hpp
@@ -25,7 +25,10 @@
 #include "hardware_interface/component_parser.hpp"
 #include "hardware_interface/handle.hpp"
 #include "hardware_interface/hardware_info.hpp"
+#include "hardware_interface/types/hardware_interface_emergency_stop_signal.hpp"
+#include "hardware_interface/types/hardware_interface_error_signals.hpp"
 #include "hardware_interface/types/hardware_interface_return_values.hpp"
+#include "hardware_interface/types/hardware_interface_warning_signals.hpp"
 #include "hardware_interface/types/lifecycle_state_names.hpp"
 #include "lifecycle_msgs/msg/state.hpp"
 #include "rclcpp/duration.hpp"
@@ -103,6 +106,7 @@ class ActuatorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNod
     info_ = hardware_info;
     import_state_interface_descriptions(info_);
     import_command_interface_descriptions(info_);
+    create_report_interfaces();
     return CallbackReturn::SUCCESS;
   };
 
@@ -134,6 +138,52 @@ class ActuatorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNod
     }
   }
 
+  /**
+   * Creates all interfaces used for reporting emergency stop, warning and error messages.
+   * The available report interfaces are: EMERGENCY_STOP_SIGNAL, ERROR_SIGNAL, ERROR_SIGNAL_MESSAGE,
+   * WARNING_SIGNAL and WARNING_SIGNAL_MESSAGE. Where the <report_type>_MESSAGE hold the message for
+   * the corresponding report signal.
+   * The interfaces are named like <hardware_name>/<report_interface_type>. E.g. if hardware is
+   * called joint_1 -> interface for WARNING_SIGNAL is called: joint_1/WARNING_SIGNAL
+   */
+  void create_report_interfaces()
+  {
+    // EMERGENCY STOP
+    InterfaceInfo emergency_interface_info;
+    emergency_interface_info.name = hardware_interface::EMERGENCY_STOP_SIGNAL;
+    emergency_interface_info.data_type = "bool";
+    InterfaceDescription emergency_interface_descr(info_.name, emergency_interface_info);
+    emergency_stop_ = std::make_shared<StateInterface>(emergency_interface_descr);
+
+    // ERROR
+    // create error signal interface
+    InterfaceInfo error_interface_info;
+    error_interface_info.name = hardware_interface::ERROR_SIGNAL_INTERFACE_NAME;
+    error_interface_info.data_type = "std::array<uint8_t>";
+    InterfaceDescription error_interface_descr(info_.name, error_interface_info);
+    error_signal_ = std::make_shared<StateInterface>(error_interface_descr);
+    // create error signal report message interface
+    InterfaceInfo error_msg_interface_info;
+    error_msg_interface_info.name = hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME;
+    error_msg_interface_info.data_type = "std::array<std::string>";
+    InterfaceDescription error_msg_interface_descr(info_.name, error_msg_interface_info);
+    error_signal_message_ = std::make_shared<StateInterface>(error_msg_interface_descr);
+
+    // WARNING
+    //  create warning signal interface
+    InterfaceInfo warning_interface_info;
+    warning_interface_info.name = hardware_interface::WARNING_SIGNAL_INTERFACE_NAME;
+    warning_interface_info.data_type = "std::array<uint8_t>";
+    InterfaceDescription warning_interface_descr(info_.name, warning_interface_info);
+    warning_signal_ = std::make_shared<StateInterface>(warning_interface_descr);
+    // create warning signal report message interface
+    InterfaceInfo warning_msg_interface_info;
+    warning_msg_interface_info.name = hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME;
+    warning_msg_interface_info.data_type = "std::array<std::string>";
+    InterfaceDescription warning_msg_interface_descr(info_.name, warning_msg_interface_info);
+    warning_signal_message_ = std::make_shared<StateInterface>(warning_msg_interface_descr);
+  }
+
   /// Exports all state interfaces for this hardware interface.
   /**
    * Old way of exporting the StateInterfaces. If a empty vector is returned then
@@ -190,6 +240,14 @@ class ActuatorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNod
       actuator_states_.insert(std::make_pair(name, state_interface));
       state_interfaces.push_back(state_interface);
     }
+
+    // export warning signal interfaces
+    state_interfaces.push_back(emergency_stop_);
+    state_interfaces.push_back(error_signal_);
+    state_interfaces.push_back(error_signal_message_);
+    state_interfaces.push_back(warning_signal_);
+    state_interfaces.push_back(warning_signal_message_);
+
     return state_interfaces;
   }
 
@@ -353,6 +411,35 @@ class ActuatorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNod
     return actuator_commands_.at(interface_name)->get_value();
   }
 
+  void set_emergency_stop(const double & emergency_stop)
+  {
+    emergency_stop_->set_value(emergency_stop);
+  }
+
+  double get_emergency_stop() const { return emergency_stop_->get_value(); }
+
+  void set_error_code(const double & error_code) { error_signal_->set_value(error_code); }
+
+  double get_error_code() const { return error_signal_->get_value(); }
+
+  void set_error_message(const double & error_message)
+  {
+    error_signal_message_->set_value(error_message);
+  }
+
+  double get_error_message() const { return error_signal_message_->get_value(); }
+
+  void set_warning_code(const double & warning_codes) { warning_signal_->set_value(warning_codes); }
+
+  double get_warning_code() const { return warning_signal_->get_value(); }
+
+  void set_warning_message(const double & error_message)
+  {
+    warning_signal_message_->set_value(error_message);
+  }
+
+  double get_warning_message() const { return warning_signal_message_->get_value(); }
+
 protected:
   HardwareInfo info_;
   std::unordered_map<std::string, InterfaceDescription> joint_state_interfaces_;
@@ -361,6 +448,13 @@ class ActuatorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNod
   std::unordered_map<std::string, std::shared_ptr<StateInterface>> actuator_states_;
   std::unordered_map<std::string, std::shared_ptr<CommandInterface>> actuator_commands_;
 
+private:
+  std::shared_ptr<StateInterface> emergency_stop_;
+  std::shared_ptr<StateInterface> error_signal_;
+  std::shared_ptr<StateInterface> error_signal_message_;
+  std::shared_ptr<StateInterface> warning_signal_;
+  std::shared_ptr<StateInterface> warning_signal_message_;
+
   rclcpp_lifecycle::State lifecycle_state_;
 };
 
diff --git a/hardware_interface/include/hardware_interface/handle.hpp b/hardware_interface/include/hardware_interface/handle.hpp
index 72b1d6cf92f..16d06c578dd 100644
--- a/hardware_interface/include/hardware_interface/handle.hpp
+++ b/hardware_interface/include/hardware_interface/handle.hpp
@@ -15,6 +15,7 @@
 #ifndef HARDWARE_INTERFACE__HANDLE_HPP_
 #define HARDWARE_INTERFACE__HANDLE_HPP_
 
+#include <array>
 #include <limits>
 #include <memory>
 #include <string>
@@ -23,8 +24,9 @@
 
 #include "hardware_interface/hardware_info.hpp"
 #include "hardware_interface/macros.hpp"
+#include "hardware_interface/types/hardware_interface_error_signals.hpp"
+#include "hardware_interface/types/hardware_interface_warning_signals.hpp"
 #include "hardware_interface/visibility_control.h"
-
 namespace hardware_interface
 {
 
diff --git a/hardware_interface/include/hardware_interface/sensor_interface.hpp b/hardware_interface/include/hardware_interface/sensor_interface.hpp
index c61abf41570..0d082163f70 100644
--- a/hardware_interface/include/hardware_interface/sensor_interface.hpp
+++ b/hardware_interface/include/hardware_interface/sensor_interface.hpp
@@ -25,7 +25,9 @@
 #include "hardware_interface/component_parser.hpp"
 #include "hardware_interface/handle.hpp"
 #include "hardware_interface/hardware_info.hpp"
+#include "hardware_interface/types/hardware_interface_error_signals.hpp"
 #include "hardware_interface/types/hardware_interface_return_values.hpp"
+#include "hardware_interface/types/hardware_interface_warning_signals.hpp"
 #include "hardware_interface/types/lifecycle_state_names.hpp"
 #include "lifecycle_msgs/msg/state.hpp"
 #include "rclcpp/duration.hpp"
@@ -102,6 +104,7 @@ class SensorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
   {
     info_ = hardware_info;
     import_state_interface_descriptions(info_);
+    create_report_interfaces();
     return CallbackReturn::SUCCESS;
   };
 
@@ -119,6 +122,45 @@ class SensorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
     }
   }
 
+  /**
+   * Creates all interfaces used for reporting warning and error messages.
+   * The available report interfaces are: ERROR_SIGNAL, ERROR_SIGNAL_MESSAGE,
+   * WARNING_SIGNAL and WARNING_SIGNAL_MESSAGE. Where the <report_type>_MESSAGE hold the message for
+   * the corresponding report signal.
+   * The interfaces are named like <hardware_name>/<report_interface_type>. E.g. if hardware is
+   * called sensor_1 -> interface for WARNING_SIGNAL is called: sensor_1/WARNING_SIGNAL
+   */
+  void create_report_interfaces()
+  {
+    // ERROR
+    // create error signal interface
+    InterfaceInfo error_interface_info;
+    error_interface_info.name = hardware_interface::ERROR_SIGNAL_INTERFACE_NAME;
+    error_interface_info.data_type = "std::array<uint8_t>";
+    InterfaceDescription error_interface_descr(info_.name, error_interface_info);
+    error_signal_ = std::make_shared<StateInterface>(error_interface_descr);
+    // create error signal report message interface
+    InterfaceInfo error_msg_interface_info;
+    error_msg_interface_info.name = hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME;
+    error_msg_interface_info.data_type = "std::array<std::string>";
+    InterfaceDescription error_msg_interface_descr(info_.name, error_msg_interface_info);
+    error_signal_message_ = std::make_shared<StateInterface>(error_msg_interface_descr);
+
+    // WARNING
+    //  create warning signal interface
+    InterfaceInfo warning_interface_info;
+    warning_interface_info.name = hardware_interface::WARNING_SIGNAL_INTERFACE_NAME;
+    warning_interface_info.data_type = "std::array<uint8_t>";
+    InterfaceDescription warning_interface_descr(info_.name, warning_interface_info);
+    warning_signal_ = std::make_shared<StateInterface>(warning_interface_descr);
+    // create warning signal report message interface
+    InterfaceInfo warning_msg_interface_info;
+    warning_msg_interface_info.name = hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME;
+    warning_msg_interface_info.data_type = "std::array<std::string>";
+    InterfaceDescription warning_msg_interface_descr(info_.name, warning_msg_interface_info);
+    warning_signal_message_ = std::make_shared<StateInterface>(warning_msg_interface_descr);
+  }
+
   /// Exports all state interfaces for this hardware interface.
   /**
    * Old way of exporting the StateInterfaces. If a empty vector is returned then
@@ -177,6 +219,12 @@ class SensorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
       state_interfaces.push_back(state_interface);
     }
 
+    // export warning signal interfaces
+    state_interfaces.push_back(error_signal_);
+    state_interfaces.push_back(error_signal_message_);
+    state_interfaces.push_back(warning_signal_);
+    state_interfaces.push_back(warning_signal_message_);
+
     return state_interfaces;
   }
 
@@ -220,6 +268,28 @@ class SensorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
     return sensor_states_.at(interface_name)->get_value();
   }
 
+  void set_error_code(const double & error_code) { error_signal_->set_value(error_code); }
+
+  double get_error_code() const { return error_signal_->get_value(); }
+
+  void set_error_message(const double & error_message)
+  {
+    error_signal_message_->set_value(error_message);
+  }
+
+  double get_error_message() const { return error_signal_message_->get_value(); }
+
+  void set_warning_code(const double & warning_codes) { warning_signal_->set_value(warning_codes); }
+
+  double get_warning_code() const { return warning_signal_->get_value(); }
+
+  void set_warning_message(const double & error_message)
+  {
+    warning_signal_message_->set_value(error_message);
+  }
+
+  double get_warning_message() const { return warning_signal_message_->get_value(); }
+
 protected:
   HardwareInfo info_;
 
@@ -227,6 +297,12 @@ class SensorInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
 
   std::unordered_map<std::string, std::shared_ptr<StateInterface>> sensor_states_;
 
+private:
+  std::shared_ptr<StateInterface> error_signal_;
+  std::shared_ptr<StateInterface> error_signal_message_;
+  std::shared_ptr<StateInterface> warning_signal_;
+  std::shared_ptr<StateInterface> warning_signal_message_;
+
   rclcpp_lifecycle::State lifecycle_state_;
 };
 
diff --git a/hardware_interface/include/hardware_interface/system_interface.hpp b/hardware_interface/include/hardware_interface/system_interface.hpp
index 07135c72a65..762299a56f2 100644
--- a/hardware_interface/include/hardware_interface/system_interface.hpp
+++ b/hardware_interface/include/hardware_interface/system_interface.hpp
@@ -25,8 +25,11 @@
 #include "hardware_interface/component_parser.hpp"
 #include "hardware_interface/handle.hpp"
 #include "hardware_interface/hardware_info.hpp"
+#include "hardware_interface/types/hardware_interface_emergency_stop_signal.hpp"
+#include "hardware_interface/types/hardware_interface_error_signals.hpp"
 #include "hardware_interface/types/hardware_interface_return_values.hpp"
 #include "hardware_interface/types/hardware_interface_type_values.hpp"
+#include "hardware_interface/types/hardware_interface_warning_signals.hpp"
 #include "hardware_interface/types/lifecycle_state_names.hpp"
 #include "lifecycle_msgs/msg/state.hpp"
 #include "rclcpp/duration.hpp"
@@ -105,6 +108,7 @@ class SystemInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
     info_ = hardware_info;
     import_state_interface_descriptions(info_);
     import_command_interface_descriptions(info_);
+    create_report_interfaces();
     return CallbackReturn::SUCCESS;
   };
 
@@ -154,6 +158,52 @@ class SystemInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
     }
   }
 
+  /**
+   * Creates all interfaces used for reporting emergency stop, warning and error messages.
+   * The available report interfaces are: EMERGENCY_STOP_SIGNAL, ERROR_SIGNAL, ERROR_SIGNAL_MESSAGE,
+   * WARNING_SIGNAL and WARNING_SIGNAL_MESSAGE. Where the <report_type>_MESSAGE hold the message for
+   * the corresponding report signal.
+   * The interfaces are named like <hardware_name>/<report_interface_type>. E.g. if hardware is
+   * called rrbot -> interface for WARNING_SIGNAL is called: rrbot/WARNING_SIGNAL
+   */
+  void create_report_interfaces()
+  {
+    // EMERGENCY STOP
+    InterfaceInfo emergency_interface_info;
+    emergency_interface_info.name = hardware_interface::EMERGENCY_STOP_SIGNAL;
+    emergency_interface_info.data_type = "bool";
+    InterfaceDescription emergency_interface_descr(info_.name, emergency_interface_info);
+    emergency_stop_ = std::make_shared<StateInterface>(emergency_interface_descr);
+
+    // ERROR
+    // create error signal interface
+    InterfaceInfo error_interface_info;
+    error_interface_info.name = hardware_interface::ERROR_SIGNAL_INTERFACE_NAME;
+    error_interface_info.data_type = "std::array<uint8_t>";
+    InterfaceDescription error_interface_descr(info_.name, error_interface_info);
+    error_signal_ = std::make_shared<StateInterface>(error_interface_descr);
+    // create error signal report message interface
+    InterfaceInfo error_msg_interface_info;
+    error_msg_interface_info.name = hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME;
+    error_msg_interface_info.data_type = "std::array<std::string>";
+    InterfaceDescription error_msg_interface_descr(info_.name, error_msg_interface_info);
+    error_signal_message_ = std::make_shared<StateInterface>(error_msg_interface_descr);
+
+    // WARNING
+    //  create warning signal interface
+    InterfaceInfo warning_interface_info;
+    warning_interface_info.name = hardware_interface::WARNING_SIGNAL_INTERFACE_NAME;
+    warning_interface_info.data_type = "std::array<uint8_t>";
+    InterfaceDescription warning_interface_descr(info_.name, warning_interface_info);
+    warning_signal_ = std::make_shared<StateInterface>(warning_interface_descr);
+    // create warning signal report message interface
+    InterfaceInfo warning_msg_interface_info;
+    warning_msg_interface_info.name = hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME;
+    warning_msg_interface_info.data_type = "std::array<std::string>";
+    InterfaceDescription warning_msg_interface_descr(info_.name, warning_msg_interface_info);
+    warning_signal_message_ = std::make_shared<StateInterface>(warning_msg_interface_descr);
+  }
+
   /// Exports all state interfaces for this hardware interface.
   /**
    * Old way of exporting the StateInterfaces. If a empty vector is returned then
@@ -223,6 +273,14 @@ class SystemInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
       system_states_.insert(std::make_pair(name, state_interface));
       state_interfaces.push_back(state_interface);
     }
+
+    // export warning signal interfaces
+    state_interfaces.push_back(emergency_stop_);
+    state_interfaces.push_back(error_signal_);
+    state_interfaces.push_back(error_signal_message_);
+    state_interfaces.push_back(warning_signal_);
+    state_interfaces.push_back(warning_signal_message_);
+
     return state_interfaces;
   }
 
@@ -393,6 +451,35 @@ class SystemInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
     return system_commands_.at(interface_name)->get_value();
   }
 
+  void set_emergency_stop(const double & emergency_stop)
+  {
+    emergency_stop_->set_value(emergency_stop);
+  }
+
+  double get_emergency_stop() const { return emergency_stop_->get_value(); }
+
+  void set_error_code(const double & error_code) { error_signal_->set_value(error_code); }
+
+  double get_error_code() const { return error_signal_->get_value(); }
+
+  void set_error_message(const double & error_message)
+  {
+    error_signal_message_->set_value(error_message);
+  }
+
+  double get_error_message() const { return error_signal_message_->get_value(); }
+
+  void set_warning_code(const double & warning_codes) { warning_signal_->set_value(warning_codes); }
+
+  double get_warning_code() const { return warning_signal_->get_value(); }
+
+  void set_warning_message(const double & error_message)
+  {
+    warning_signal_message_->set_value(error_message);
+  }
+
+  double get_warning_message() const { return warning_signal_message_->get_value(); }
+
 protected:
   HardwareInfo info_;
   std::unordered_map<std::string, InterfaceDescription> joint_state_interfaces_;
@@ -406,6 +493,13 @@ class SystemInterface : public rclcpp_lifecycle::node_interfaces::LifecycleNodeI
   std::unordered_map<std::string, std::shared_ptr<StateInterface>> system_states_;
   std::unordered_map<std::string, std::shared_ptr<CommandInterface>> system_commands_;
 
+private:
+  std::shared_ptr<StateInterface> emergency_stop_;
+  std::shared_ptr<StateInterface> error_signal_;
+  std::shared_ptr<StateInterface> error_signal_message_;
+  std::shared_ptr<StateInterface> warning_signal_;
+  std::shared_ptr<StateInterface> warning_signal_message_;
+
   rclcpp_lifecycle::State lifecycle_state_;
 };
 
diff --git a/hardware_interface/include/hardware_interface/types/hardware_interface_emergency_stop_signal.hpp b/hardware_interface/include/hardware_interface/types/hardware_interface_emergency_stop_signal.hpp
new file mode 100644
index 00000000000..1478556f5fd
--- /dev/null
+++ b/hardware_interface/include/hardware_interface/types/hardware_interface_emergency_stop_signal.hpp
@@ -0,0 +1,29 @@
+// Copyright 2017 Open Source Robotics Foundation, Inc.
+//
+// Licensed 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.
+
+#ifndef HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_EMERGENCY_STOP_SIGNAL_HPP_
+#define HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_EMERGENCY_STOP_SIGNAL_HPP_
+
+#include <cstdint>
+#include <vector>
+
+namespace hardware_interface
+{
+// Count of how many different emergency stop signals there are that can be reported.
+const size_t emergency_stop_signal_count = 1;
+
+constexpr char EMERGENCY_STOP_SIGNAL[] = "EMERGENCY_STOP_SIGNAL";
+}  // namespace hardware_interface
+
+#endif  // HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_EMERGENCY_STOP_SIGNAL_HPP_
diff --git a/hardware_interface/include/hardware_interface/types/hardware_interface_error_signals.hpp b/hardware_interface/include/hardware_interface/types/hardware_interface_error_signals.hpp
new file mode 100644
index 00000000000..4b5095ef398
--- /dev/null
+++ b/hardware_interface/include/hardware_interface/types/hardware_interface_error_signals.hpp
@@ -0,0 +1,105 @@
+// Copyright 2017 Open Source Robotics Foundation, Inc.
+//
+// Licensed 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.
+
+#ifndef HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_ERROR_SIGNALS_HPP_
+#define HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_ERROR_SIGNALS_HPP_
+
+#include <cstdint>
+#include <vector>
+
+namespace hardware_interface
+{
+
+// Count of how many different error signals there are that can be reported.
+const size_t error_signal_count = 32;
+
+constexpr char ERROR_SIGNAL_INTERFACE_NAME[] = "ERROR_SIGNAL";
+// Available error signal names
+enum class error_signal : std::uint8_t
+{
+  ERROR_SIGNAL_0 = 0,
+  ERROR_SIGNAL_1 = 1,
+  ERROR_SIGNAL_2 = 2,
+  ERROR_SIGNAL_3 = 3,
+  ERROR_SIGNAL_4 = 4,
+  ERROR_SIGNAL_5 = 5,
+  ERROR_SIGNAL_6 = 6,
+  ERROR_SIGNAL_7 = 7,
+  ERROR_SIGNAL_8 = 8,
+  ERROR_SIGNAL_9 = 9,
+  ERROR_SIGNAL_10 = 10,
+  ERROR_SIGNAL_11 = 11,
+  ERROR_SIGNAL_12 = 12,
+  ERROR_SIGNAL_13 = 13,
+  ERROR_SIGNAL_14 = 14,
+  ERROR_SIGNAL_15 = 15,
+  ERROR_SIGNAL_16 = 16,
+  ERROR_SIGNAL_17 = 17,
+  ERROR_SIGNAL_18 = 18,
+  ERROR_SIGNAL_19 = 19,
+  ERROR_SIGNAL_20 = 20,
+  ERROR_SIGNAL_21 = 21,
+  ERROR_SIGNAL_22 = 22,
+  ERROR_SIGNAL_23 = 23,
+  ERROR_SIGNAL_24 = 24,
+  ERROR_SIGNAL_25 = 25,
+  ERROR_SIGNAL_26 = 26,
+  ERROR_SIGNAL_27 = 27,
+  ERROR_SIGNAL_28 = 28,
+  ERROR_SIGNAL_29 = 29,
+  ERROR_SIGNAL_30 = 30,
+  ERROR_SIGNAL_31 = 31
+};
+
+constexpr char ERROR_SIGNAL_MESSAGE_INTERFACE_NAME[] = "ERROR_SIGNAL_MESSAGE";
+// Available WARNING signal message names
+enum class error_signal_message : std::uint8_t
+{
+  ERROR_SIGNAL_MESSAGE_0 = 0,
+  ERROR_SIGNAL_MESSAGE_1 = 1,
+  ERROR_SIGNAL_MESSAGE_2 = 2,
+  ERROR_SIGNAL_MESSAGE_3 = 3,
+  ERROR_SIGNAL_MESSAGE_4 = 4,
+  ERROR_SIGNAL_MESSAGE_5 = 5,
+  ERROR_SIGNAL_MESSAGE_6 = 6,
+  ERROR_SIGNAL_MESSAGE_7 = 7,
+  ERROR_SIGNAL_MESSAGE_8 = 8,
+  ERROR_SIGNAL_MESSAGE_9 = 9,
+  ERROR_SIGNAL_MESSAGE_10 = 10,
+  ERROR_SIGNAL_MESSAGE_11 = 11,
+  ERROR_SIGNAL_MESSAGE_12 = 12,
+  ERROR_SIGNAL_MESSAGE_13 = 13,
+  ERROR_SIGNAL_MESSAGE_14 = 14,
+  ERROR_SIGNAL_MESSAGE_15 = 15,
+  ERROR_SIGNAL_MESSAGE_16 = 16,
+  ERROR_SIGNAL_MESSAGE_17 = 17,
+  ERROR_SIGNAL_MESSAGE_18 = 18,
+  ERROR_SIGNAL_MESSAGE_19 = 19,
+  ERROR_SIGNAL_MESSAGE_20 = 20,
+  ERROR_SIGNAL_MESSAGE_21 = 21,
+  ERROR_SIGNAL_MESSAGE_22 = 22,
+  ERROR_SIGNAL_MESSAGE_23 = 23,
+  ERROR_SIGNAL_MESSAGE_24 = 24,
+  ERROR_SIGNAL_MESSAGE_25 = 25,
+  ERROR_SIGNAL_MESSAGE_26 = 26,
+  ERROR_SIGNAL_MESSAGE_27 = 27,
+  ERROR_SIGNAL_MESSAGE_28 = 28,
+  ERROR_SIGNAL_MESSAGE_29 = 29,
+  ERROR_SIGNAL_MESSAGE_30 = 30,
+  ERROR_SIGNAL_MESSAGE_31 = 31
+};
+
+}  // namespace hardware_interface
+
+#endif  // HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_ERROR_SIGNALS_HPP_
diff --git a/hardware_interface/include/hardware_interface/types/hardware_interface_warning_signals.hpp b/hardware_interface/include/hardware_interface/types/hardware_interface_warning_signals.hpp
new file mode 100644
index 00000000000..434f2ec9880
--- /dev/null
+++ b/hardware_interface/include/hardware_interface/types/hardware_interface_warning_signals.hpp
@@ -0,0 +1,104 @@
+// Copyright 2017 Open Source Robotics Foundation, Inc.
+//
+// Licensed 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.
+
+#ifndef HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_WARNING_SIGNALS_HPP_
+#define HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_WARNING_SIGNALS_HPP_
+
+#include <cstdint>
+#include <vector>
+
+namespace hardware_interface
+{
+// Count of how many different warn signals there are that can be reported.
+const size_t warning_signal_count = 32;
+
+constexpr char WARNING_SIGNAL_INTERFACE_NAME[] = "WARNING_SIGNAL";
+// Available warning signals names mapping to position in the interface
+enum class warning_signal : std::uint8_t
+{
+  WARNING_SIGNAL_0 = 0,
+  WARNING_SIGNAL_1 = 1,
+  WARNING_SIGNAL_2 = 2,
+  WARNING_SIGNAL_3 = 3,
+  WARNING_SIGNAL_4 = 4,
+  WARNING_SIGNAL_5 = 5,
+  WARNING_SIGNAL_6 = 6,
+  WARNING_SIGNAL_7 = 7,
+  WARNING_SIGNAL_8 = 8,
+  WARNING_SIGNAL_9 = 9,
+  WARNING_SIGNAL_10 = 10,
+  WARNING_SIGNAL_11 = 11,
+  WARNING_SIGNAL_12 = 12,
+  WARNING_SIGNAL_13 = 13,
+  WARNING_SIGNAL_14 = 14,
+  WARNING_SIGNAL_15 = 15,
+  WARNING_SIGNAL_16 = 16,
+  WARNING_SIGNAL_17 = 17,
+  WARNING_SIGNAL_18 = 18,
+  WARNING_SIGNAL_19 = 19,
+  WARNING_SIGNAL_20 = 20,
+  WARNING_SIGNAL_21 = 21,
+  WARNING_SIGNAL_22 = 22,
+  WARNING_SIGNAL_23 = 23,
+  WARNING_SIGNAL_24 = 24,
+  WARNING_SIGNAL_25 = 25,
+  WARNING_SIGNAL_26 = 26,
+  WARNING_SIGNAL_27 = 27,
+  WARNING_SIGNAL_28 = 28,
+  WARNING_SIGNAL_29 = 29,
+  WARNING_SIGNAL_30 = 30,
+  WARNING_SIGNAL_31 = 31
+};
+
+constexpr char WARNING_SIGNAL_MESSAGE_INTERFACE_NAME[] = "WARNING_SIGNAL_MESSAGE";
+// Available WARNING signal message names
+enum class warning_signal_message : std::uint8_t
+{
+  WARNING_SIGNAL_MESSAGE_0 = 0,
+  WARNING_SIGNAL_MESSAGE_1 = 1,
+  WARNING_SIGNAL_MESSAGE_2 = 2,
+  WARNING_SIGNAL_MESSAGE_3 = 3,
+  WARNING_SIGNAL_MESSAGE_4 = 4,
+  WARNING_SIGNAL_MESSAGE_5 = 5,
+  WARNING_SIGNAL_MESSAGE_6 = 6,
+  WARNING_SIGNAL_MESSAGE_7 = 7,
+  WARNING_SIGNAL_MESSAGE_8 = 8,
+  WARNING_SIGNAL_MESSAGE_9 = 9,
+  WARNING_SIGNAL_MESSAGE_10 = 10,
+  WARNING_SIGNAL_MESSAGE_11 = 11,
+  WARNING_SIGNAL_MESSAGE_12 = 12,
+  WARNING_SIGNAL_MESSAGE_13 = 13,
+  WARNING_SIGNAL_MESSAGE_14 = 14,
+  WARNING_SIGNAL_MESSAGE_15 = 15,
+  WARNING_SIGNAL_MESSAGE_16 = 16,
+  WARNING_SIGNAL_MESSAGE_17 = 17,
+  WARNING_SIGNAL_MESSAGE_18 = 18,
+  WARNING_SIGNAL_MESSAGE_19 = 19,
+  WARNING_SIGNAL_MESSAGE_20 = 20,
+  WARNING_SIGNAL_MESSAGE_21 = 21,
+  WARNING_SIGNAL_MESSAGE_22 = 22,
+  WARNING_SIGNAL_MESSAGE_23 = 23,
+  WARNING_SIGNAL_MESSAGE_24 = 24,
+  WARNING_SIGNAL_MESSAGE_25 = 25,
+  WARNING_SIGNAL_MESSAGE_26 = 26,
+  WARNING_SIGNAL_MESSAGE_27 = 27,
+  WARNING_SIGNAL_MESSAGE_28 = 28,
+  WARNING_SIGNAL_MESSAGE_29 = 29,
+  WARNING_SIGNAL_MESSAGE_30 = 30,
+  WARNING_SIGNAL_MESSAGE_31 = 31
+};
+
+}  // namespace hardware_interface
+
+#endif  // HARDWARE_INTERFACE__TYPES__HARDWARE_INTERFACE_WARNING_SIGNALS_HPP_
diff --git a/hardware_interface/test/test_component_interfaces.cpp b/hardware_interface/test/test_component_interfaces.cpp
index e185b532999..355815b2d35 100644
--- a/hardware_interface/test/test_component_interfaces.cpp
+++ b/hardware_interface/test/test_component_interfaces.cpp
@@ -45,6 +45,11 @@ namespace
 const auto TIME = rclcpp::Time(0);
 const auto PERIOD = rclcpp::Duration::from_seconds(0.01);
 constexpr unsigned int TRIGGER_READ_WRITE_ERROR_CALLS = 10000;
+const auto emergency_stop_signal_size = 1;
+const auto warnig_signals_size = 2;
+const auto error_signals_size = 2;
+const auto report_signals_size =
+  emergency_stop_signal_size + warnig_signals_size + error_signals_size;
 }  // namespace
 
 using namespace ::testing;  // NOLINT
@@ -788,7 +793,7 @@ TEST(TestComponentInterfaces, dummy_actuator_default)
   EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
 
   auto state_interfaces = actuator_hw.export_state_interfaces();
-  ASSERT_EQ(2u, state_interfaces.size());
+  ASSERT_EQ(2u + report_signals_size, state_interfaces.size());
   {
     auto [contains, position] =
       test_components::vector_contains(state_interfaces, "joint1/position");
@@ -939,7 +944,7 @@ TEST(TestComponentInterfaces, dummy_sensor_default)
   EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
 
   auto state_interfaces = sensor_hw.export_state_interfaces();
-  ASSERT_EQ(1u, state_interfaces.size());
+  ASSERT_EQ(1u + warnig_signals_size + error_signals_size, state_interfaces.size());
   {
     auto [contains, position] =
       test_components::vector_contains(state_interfaces, "joint1/voltage");
@@ -1108,7 +1113,7 @@ TEST(TestComponentInterfaces, dummy_system_default)
   EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
 
   auto state_interfaces = system_hw.export_state_interfaces();
-  ASSERT_EQ(6u, state_interfaces.size());
+  ASSERT_EQ(6u + report_signals_size, state_interfaces.size());
   {
     auto [contains, position] =
       test_components::vector_contains(state_interfaces, "joint1/position");
diff --git a/hardware_interface/test/test_component_interfaces_custom_export.cpp b/hardware_interface/test/test_component_interfaces_custom_export.cpp
index fe76dc21acd..237d6244b0a 100644
--- a/hardware_interface/test/test_component_interfaces_custom_export.cpp
+++ b/hardware_interface/test/test_component_interfaces_custom_export.cpp
@@ -40,11 +40,15 @@
 
 // Values to send over command interface to trigger error in write and read methods
 
+// Values to send over command interface to trigger error in write and read methods
+
 namespace
 {
-const auto TIME = rclcpp::Time(0);
-const auto PERIOD = rclcpp::Duration::from_seconds(0.01);
-constexpr unsigned int TRIGGER_READ_WRITE_ERROR_CALLS = 10000;
+const auto emergency_stop_signal_size = 1;
+const auto warnig_signals_size = 2;
+const auto error_signals_size = 2;
+const auto report_signals_size =
+  emergency_stop_signal_size + warnig_signals_size + error_signals_size;
 }  // namespace
 
 using namespace ::testing;  // NOLINT
@@ -181,8 +185,11 @@ TEST(TestComponentInterfaces, dummy_actuator_default_custom_export)
   EXPECT_EQ(lifecycle_msgs::msg::State::PRIMARY_STATE_UNCONFIGURED, state.id());
   EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
 
+  const auto listed_interface_size = 2u;
+  const auto interfaces_size = listed_interface_size + report_signals_size;
   auto state_interfaces = actuator_hw.export_state_interfaces();
-  ASSERT_EQ(3u, state_interfaces.size());
+  // interfaces size + the one unlisted interface "joint1/some_unlisted_interface"
+  ASSERT_EQ(interfaces_size + 1u, state_interfaces.size());
   {
     auto [contains, position] =
       test_components::vector_contains(state_interfaces, "joint1/position");
@@ -244,8 +251,11 @@ TEST(TestComponentInterfaces, dummy_sensor_default_custom_export)
   EXPECT_EQ(lifecycle_msgs::msg::State::PRIMARY_STATE_UNCONFIGURED, state.id());
   EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
 
+  const auto listed_interface_size = 1u;
+  const auto interfaces_sizeze = listed_interface_size + error_signals_size + warnig_signals_size;
   auto state_interfaces = sensor_hw.export_state_interfaces();
-  ASSERT_EQ(2u, state_interfaces.size());
+  // interfaces size + the one unlisted interface "joint1/some_unlisted_interface"
+  ASSERT_EQ(interfaces_sizeze + 1u, state_interfaces.size());
   {
     auto [contains, position] =
       test_components::vector_contains(state_interfaces, "joint1/voltage");
@@ -280,8 +290,11 @@ TEST(TestComponentInterfaces, dummy_system_default_custom_export)
   EXPECT_EQ(lifecycle_msgs::msg::State::PRIMARY_STATE_UNCONFIGURED, state.id());
   EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
 
+  const auto listed_interface_size = 6u;
+  const auto interfaces_sizeze = listed_interface_size + report_signals_size;
   auto state_interfaces = system_hw.export_state_interfaces();
-  ASSERT_EQ(7u, state_interfaces.size());
+  // interfaces size + the one unlisted interface "joint1/some_unlisted_interface"
+  ASSERT_EQ(interfaces_sizeze + 1u, state_interfaces.size());
   {
     auto [contains, position] =
       test_components::vector_contains(state_interfaces, "joint1/position");
diff --git a/hardware_interface/test/test_error_warning_codes.cpp b/hardware_interface/test/test_error_warning_codes.cpp
new file mode 100644
index 00000000000..ee847fa1d35
--- /dev/null
+++ b/hardware_interface/test/test_error_warning_codes.cpp
@@ -0,0 +1,727 @@
+// Copyright 2020 ros2_control development team
+//
+// Licensed 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.
+
+#include <gmock/gmock.h>
+
+#include <array>
+#include <limits>
+#include <memory>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+#include "hardware_interface/actuator.hpp"
+#include "hardware_interface/actuator_interface.hpp"
+#include "hardware_interface/hardware_info.hpp"
+#include "hardware_interface/sensor.hpp"
+#include "hardware_interface/sensor_interface.hpp"
+#include "hardware_interface/system.hpp"
+#include "hardware_interface/system_interface.hpp"
+#include "hardware_interface/types/hardware_interface_emergency_stop_signal.hpp"
+#include "hardware_interface/types/hardware_interface_error_signals.hpp"
+#include "hardware_interface/types/hardware_interface_return_values.hpp"
+#include "hardware_interface/types/hardware_interface_type_values.hpp"
+#include "hardware_interface/types/hardware_interface_warning_signals.hpp"
+#include "hardware_interface/types/lifecycle_state_names.hpp"
+#include "lifecycle_msgs/msg/state.hpp"
+#include "rclcpp_lifecycle/node_interfaces/lifecycle_node_interface.hpp"
+#include "ros2_control_test_assets/components_urdfs.hpp"
+#include "ros2_control_test_assets/descriptions.hpp"
+#include "test_components.hpp"
+// Values to send over command interface to trigger error in write and read methods
+
+namespace
+{
+const auto TIME = rclcpp::Time(0);
+const auto PERIOD = rclcpp::Duration::from_seconds(0.01);
+constexpr unsigned int TRIGGER_READ_WRITE_ERROR_CALLS = 10000;
+const auto emergency_stop_signal_size = 1;
+const auto warnig_signals_size = 2;
+const auto error_signals_size = 2;
+const auto report_signals_size =
+  emergency_stop_signal_size + warnig_signals_size + error_signals_size;
+}  // namespace
+
+using namespace ::testing;  // NOLINT
+
+namespace test_components
+{
+using CallbackReturn = rclcpp_lifecycle::node_interfaces::LifecycleNodeInterface::CallbackReturn;
+
+class DummyActuatorDefault : public hardware_interface::ActuatorInterface
+{
+  CallbackReturn on_init(const hardware_interface::HardwareInfo & info) override
+  {
+    // We hardcode the info
+    if (
+      hardware_interface::ActuatorInterface::on_init(info) !=
+      hardware_interface::CallbackReturn::SUCCESS)
+    {
+      return hardware_interface::CallbackReturn::ERROR;
+    }
+    return CallbackReturn::SUCCESS;
+  }
+
+  CallbackReturn on_configure(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    set_state("joint1/position", 0.0);
+    set_state("joint1/velocity", 0.0);
+    set_emergency_stop(0.0);
+    set_error_code(0.0);
+    set_error_message(0.0);
+    set_warning_code(0.0);
+    set_warning_message(0.0);
+
+    if (recoverable_error_happened_)
+    {
+      set_command("joint1/velocity", 0.0);
+    }
+
+    read_calls_ = 0;
+    write_calls_ = 0;
+
+    return CallbackReturn::SUCCESS;
+  }
+
+  std::string get_name() const override { return "DummyActuatorDefault"; }
+
+  hardware_interface::return_type read(
+    const rclcpp::Time & /*time*/, const rclcpp::Duration & /*period*/) override
+  {
+    ++read_calls_;
+    if (read_calls_ == TRIGGER_READ_WRITE_ERROR_CALLS)
+    {
+      set_emergency_stop(1.0);
+      set_error_code(1.0);
+      set_error_message(1.0);
+      set_warning_code(1.0);
+      set_warning_message(1.0);
+      return hardware_interface::return_type::ERROR;
+    }
+
+    // no-op, state is getting propagated within write.
+    return hardware_interface::return_type::OK;
+  }
+
+  hardware_interface::return_type write(
+    const rclcpp::Time & /*time*/, const rclcpp::Duration & /*period*/) override
+  {
+    ++write_calls_;
+    if (write_calls_ == TRIGGER_READ_WRITE_ERROR_CALLS)
+    {
+      set_emergency_stop(1.0);
+      set_error_code(1.0);
+      set_error_message(1.0);
+      set_warning_code(1.0);
+      set_warning_message(1.0);
+      return hardware_interface::return_type::ERROR;
+    }
+    auto position_state = get_state("joint1/position");
+    set_state("joint1/position", position_state + get_command("joint1/velocity"));
+    set_state("joint1/velocity", get_command("joint1/velocity"));
+
+    return hardware_interface::return_type::OK;
+  }
+
+  CallbackReturn on_shutdown(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    set_state("joint1/velocity", 0.0);
+    return CallbackReturn::SUCCESS;
+  }
+
+  CallbackReturn on_error(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    if (!recoverable_error_happened_)
+    {
+      recoverable_error_happened_ = true;
+      return CallbackReturn::SUCCESS;
+    }
+    else
+    {
+      return CallbackReturn::ERROR;
+    }
+    return CallbackReturn::FAILURE;
+  }
+
+private:
+  // Helper variables to initiate error on read
+  unsigned int read_calls_ = 0;
+  unsigned int write_calls_ = 0;
+  bool recoverable_error_happened_ = false;
+};
+
+class DummySensorDefault : public hardware_interface::SensorInterface
+{
+  CallbackReturn on_init(const hardware_interface::HardwareInfo & info) override
+  {
+    if (
+      hardware_interface::SensorInterface::on_init(info) !=
+      hardware_interface::CallbackReturn::SUCCESS)
+    {
+      return hardware_interface::CallbackReturn::ERROR;
+    }
+
+    // We hardcode the info
+    return CallbackReturn::SUCCESS;
+  }
+
+  CallbackReturn on_configure(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    for (const auto & [name, descr] : sensor_state_interfaces_)
+    {
+      set_state(name, 0.0);
+    }
+    set_error_code(0.0);
+    set_error_message(0.0);
+    set_warning_code(0.0);
+    set_warning_message(0.0);
+    read_calls_ = 0;
+    return CallbackReturn::SUCCESS;
+  }
+
+  std::string get_name() const override { return "DummySensorDefault"; }
+
+  hardware_interface::return_type read(
+    const rclcpp::Time & /*time*/, const rclcpp::Duration & /*period*/) override
+  {
+    ++read_calls_;
+    if (read_calls_ == TRIGGER_READ_WRITE_ERROR_CALLS)
+    {
+      set_error_code(1.0);
+      set_error_message(1.0);
+      set_warning_code(1.0);
+      set_warning_message(1.0);
+      return hardware_interface::return_type::ERROR;
+    }
+
+    // no-op, static value
+    set_state("joint1/voltage", voltage_level_hw_value_);
+    return hardware_interface::return_type::OK;
+  }
+
+  CallbackReturn on_error(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    if (!recoverable_error_happened_)
+    {
+      recoverable_error_happened_ = true;
+      return CallbackReturn::SUCCESS;
+    }
+    else
+    {
+      return CallbackReturn::ERROR;
+    }
+    return CallbackReturn::FAILURE;
+  }
+
+private:
+  double voltage_level_hw_value_ = 0x666;
+
+  // Helper variables to initiate error on read
+  int read_calls_ = 0;
+  bool recoverable_error_happened_ = false;
+};
+
+class DummySystemDefault : public hardware_interface::SystemInterface
+{
+  CallbackReturn on_init(const hardware_interface::HardwareInfo & info) override
+  {
+    if (
+      hardware_interface::SystemInterface::on_init(info) !=
+      hardware_interface::CallbackReturn::SUCCESS)
+    {
+      return hardware_interface::CallbackReturn::ERROR;
+    }
+    // We hardcode the info
+    return CallbackReturn::SUCCESS;
+  }
+
+  CallbackReturn on_configure(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    for (auto i = 0ul; i < 3; ++i)
+    {
+      set_state(position_states_[i], 0.0);
+      set_state(velocity_states_[i], 0.0);
+    }
+    set_emergency_stop(0.0);
+    set_error_code(0.0);
+    set_error_message(0.0);
+    set_warning_code(0.0);
+    set_warning_message(0.0);
+    // reset command only if error is initiated
+    if (recoverable_error_happened_)
+    {
+      for (auto i = 0ul; i < 3; ++i)
+      {
+        set_command(velocity_commands_[i], 0.0);
+      }
+    }
+
+    read_calls_ = 0;
+    write_calls_ = 0;
+
+    return CallbackReturn::SUCCESS;
+  }
+
+  std::string get_name() const override { return "DummySystemDefault"; }
+
+  hardware_interface::return_type read(
+    const rclcpp::Time & /*time*/, const rclcpp::Duration & /*period*/) override
+  {
+    ++read_calls_;
+    if (read_calls_ == TRIGGER_READ_WRITE_ERROR_CALLS)
+    {
+      set_emergency_stop(1.0);
+      set_error_code(1.0);
+      set_error_message(1.0);
+      set_warning_code(1.0);
+      set_warning_message(1.0);
+      return hardware_interface::return_type::ERROR;
+    }
+
+    // no-op, state is getting propagated within write.
+    return hardware_interface::return_type::OK;
+  }
+
+  hardware_interface::return_type write(
+    const rclcpp::Time & /*time*/, const rclcpp::Duration & /*period*/) override
+  {
+    ++write_calls_;
+    if (write_calls_ == TRIGGER_READ_WRITE_ERROR_CALLS)
+    {
+      set_emergency_stop(1.0);
+      set_error_code(1.0);
+      set_error_message(1.0);
+      set_warning_code(1.0);
+      set_warning_message(1.0);
+      return hardware_interface::return_type::ERROR;
+    }
+
+    for (auto i = 0; i < 3; ++i)
+    {
+      auto current_pos = get_state(position_states_[i]);
+      set_state(position_states_[i], current_pos + get_command(velocity_commands_[i]));
+      set_state(velocity_states_[i], get_command(velocity_commands_[i]));
+    }
+    return hardware_interface::return_type::OK;
+  }
+
+  CallbackReturn on_shutdown(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    for (const auto & velocity_state : velocity_states_)
+    {
+      set_state(velocity_state, 0.0);
+    }
+    return CallbackReturn::SUCCESS;
+  }
+
+  CallbackReturn on_error(const rclcpp_lifecycle::State & /*previous_state*/) override
+  {
+    if (!recoverable_error_happened_)
+    {
+      recoverable_error_happened_ = true;
+      return CallbackReturn::SUCCESS;
+    }
+    else
+    {
+      return CallbackReturn::ERROR;
+    }
+    return CallbackReturn::FAILURE;
+  }
+
+private:
+  std::vector<std::string> position_states_ = {
+    "joint1/position", "joint2/position", "joint3/position"};
+  std::vector<std::string> velocity_states_ = {
+    "joint1/velocity", "joint2/velocity", "joint3/velocity"};
+  std::vector<std::string> velocity_commands_ = {
+    "joint1/velocity", "joint2/velocity", "joint3/velocity"};
+
+  // Helper variables to initiate error on read
+  unsigned int read_calls_ = 0;
+  unsigned int write_calls_ = 0;
+  bool recoverable_error_happened_ = false;
+};
+
+}  // namespace test_components
+
+TEST(TestComponentInterfaces, dummy_actuator_default)
+{
+  hardware_interface::Actuator actuator_hw(
+    std::make_unique<test_components::DummyActuatorDefault>());
+  const std::string urdf_to_test =
+    std::string(ros2_control_test_assets::urdf_head) +
+    ros2_control_test_assets::valid_urdf_ros2_control_dummy_actuator_only +
+    ros2_control_test_assets::urdf_tail;
+  const std::vector<hardware_interface::HardwareInfo> control_resources =
+    hardware_interface::parse_control_resources_from_urdf(urdf_to_test);
+  const hardware_interface::HardwareInfo dummy_actuator = control_resources[0];
+  auto state = actuator_hw.initialize(dummy_actuator);
+
+  EXPECT_EQ(lifecycle_msgs::msg::State::PRIMARY_STATE_UNCONFIGURED, state.id());
+  EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
+
+  const auto state_interface_offset = 2;
+  auto state_interfaces = actuator_hw.export_state_interfaces();
+  ASSERT_EQ(state_interface_offset + report_signals_size, state_interfaces.size());
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint1/position");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/position", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_POSITION, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint1/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/velocity", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_VELOCITY, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", state_interfaces[position]->get_prefix_name());
+  }
+  // EMERGENCY STOP
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "ActuatorModularJoint1/" + std::string(hardware_interface::EMERGENCY_STOP_SIGNAL));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "ActuatorModularJoint1/" + std::string(hardware_interface::EMERGENCY_STOP_SIGNAL),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::EMERGENCY_STOP_SIGNAL, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("ActuatorModularJoint1", state_interfaces[position]->get_prefix_name());
+  }
+  // ERROR_SIGNAL
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "ActuatorModularJoint1/" + std::string(hardware_interface::ERROR_SIGNAL_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "ActuatorModularJoint1/" + std::string(hardware_interface::ERROR_SIGNAL_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::ERROR_SIGNAL_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("ActuatorModularJoint1", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces, "ActuatorModularJoint1/" +
+                          std::string(hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "ActuatorModularJoint1/" +
+        std::string(hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("ActuatorModularJoint1", state_interfaces[position]->get_prefix_name());
+  }
+  // WARNING SIGNAL
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "ActuatorModularJoint1/" + std::string(hardware_interface::WARNING_SIGNAL_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "ActuatorModularJoint1/" + std::string(hardware_interface::WARNING_SIGNAL_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::WARNING_SIGNAL_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("ActuatorModularJoint1", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces, "ActuatorModularJoint1/" +
+                          std::string(hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "ActuatorModularJoint1/" +
+        std::string(hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("ActuatorModularJoint1", state_interfaces[position]->get_prefix_name());
+  }
+
+  auto command_interfaces = actuator_hw.export_command_interfaces();
+  ASSERT_EQ(1u, command_interfaces.size());
+  {
+    auto [contains, position] =
+      test_components::vector_contains(command_interfaces, "joint1/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/velocity", command_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::HW_IF_VELOCITY, command_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", command_interfaces[position]->get_prefix_name());
+  }
+}
+
+TEST(TestComponentInterfaces, dummy_sensor_default)
+{
+  hardware_interface::Sensor sensor_hw(std::make_unique<test_components::DummySensorDefault>());
+
+  const std::string urdf_to_test =
+    std::string(ros2_control_test_assets::urdf_head) +
+    ros2_control_test_assets::valid_urdf_ros2_control_voltage_sensor_only +
+    ros2_control_test_assets::urdf_tail;
+  const std::vector<hardware_interface::HardwareInfo> control_resources =
+    hardware_interface::parse_control_resources_from_urdf(urdf_to_test);
+  const hardware_interface::HardwareInfo voltage_sensor_res = control_resources[0];
+  auto state = sensor_hw.initialize(voltage_sensor_res);
+  EXPECT_EQ(lifecycle_msgs::msg::State::PRIMARY_STATE_UNCONFIGURED, state.id());
+  EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
+
+  const auto state_interface_offset = 1;
+  auto state_interfaces = sensor_hw.export_state_interfaces();
+  ASSERT_EQ(
+    state_interface_offset + warnig_signals_size + error_signals_size, state_interfaces.size());
+  // check that the normal interfaces get exported as expected
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint1/voltage");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/voltage", state_interfaces[position]->get_name());
+    EXPECT_EQ("voltage", state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", state_interfaces[position]->get_prefix_name());
+    EXPECT_TRUE(std::isnan(state_interfaces[position]->get_value()));
+  }
+  // ERROR_SIGNAL
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "SingleJointVoltage/" + std::string(hardware_interface::ERROR_SIGNAL_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "SingleJointVoltage/" + std::string(hardware_interface::ERROR_SIGNAL_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::ERROR_SIGNAL_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("SingleJointVoltage", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "SingleJointVoltage/" + std::string(hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "SingleJointVoltage/" + std::string(hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("SingleJointVoltage", state_interfaces[position]->get_prefix_name());
+  }
+  // WARNING SIGNAL
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "SingleJointVoltage/" + std::string(hardware_interface::WARNING_SIGNAL_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "SingleJointVoltage/" + std::string(hardware_interface::WARNING_SIGNAL_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::WARNING_SIGNAL_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("SingleJointVoltage", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces, "SingleJointVoltage/" +
+                          std::string(hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "SingleJointVoltage/" +
+        std::string(hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("SingleJointVoltage", state_interfaces[position]->get_prefix_name());
+  }
+}
+
+TEST(TestComponentInterfaces, dummy_system_default)
+{
+  hardware_interface::System system_hw(std::make_unique<test_components::DummySystemDefault>());
+
+  const std::string urdf_to_test =
+    std::string(ros2_control_test_assets::urdf_head) +
+    ros2_control_test_assets::valid_urdf_ros2_control_dummy_system_robot +
+    ros2_control_test_assets::urdf_tail;
+  const std::vector<hardware_interface::HardwareInfo> control_resources =
+    hardware_interface::parse_control_resources_from_urdf(urdf_to_test);
+  const hardware_interface::HardwareInfo dummy_system = control_resources[0];
+  auto state = system_hw.initialize(dummy_system);
+  EXPECT_EQ(lifecycle_msgs::msg::State::PRIMARY_STATE_UNCONFIGURED, state.id());
+  EXPECT_EQ(hardware_interface::lifecycle_state_names::UNCONFIGURED, state.label());
+
+  const auto state_interface_offset = 6;
+  auto state_interfaces = system_hw.export_state_interfaces();
+  ASSERT_EQ(state_interface_offset + report_signals_size, state_interfaces.size());
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint1/position");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/position", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_POSITION, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint1/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/velocity", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_VELOCITY, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint2/position");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint2/position", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_POSITION, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint2", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint2/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint2/velocity", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_VELOCITY, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint2", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint3/position");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint3/position", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_POSITION, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint3", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(state_interfaces, "joint3/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint3/velocity", state_interfaces[position]->get_name());
+    EXPECT_EQ(hardware_interface::HW_IF_VELOCITY, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint3", state_interfaces[position]->get_prefix_name());
+  }
+  // EMERGENCY STOP
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::EMERGENCY_STOP_SIGNAL));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::EMERGENCY_STOP_SIGNAL),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::EMERGENCY_STOP_SIGNAL, state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("RRBotSystemWithGPIO", state_interfaces[position]->get_prefix_name());
+  }
+  // ERROR_SIGNAL
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::ERROR_SIGNAL_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::ERROR_SIGNAL_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::ERROR_SIGNAL_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("RRBotSystemWithGPIO", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces, "RRBotSystemWithGPIO/" +
+                          std::string(hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::ERROR_SIGNAL_MESSAGE_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("RRBotSystemWithGPIO", state_interfaces[position]->get_prefix_name());
+  }
+  // WARNING SIGNAL
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces,
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::WARNING_SIGNAL_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "RRBotSystemWithGPIO/" + std::string(hardware_interface::WARNING_SIGNAL_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::WARNING_SIGNAL_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("RRBotSystemWithGPIO", state_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] = test_components::vector_contains(
+      state_interfaces, "RRBotSystemWithGPIO/" +
+                          std::string(hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME));
+    EXPECT_TRUE(contains);
+    EXPECT_EQ(
+      "RRBotSystemWithGPIO/" +
+        std::string(hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME),
+      state_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::WARNING_SIGNAL_MESSAGE_INTERFACE_NAME,
+      state_interfaces[position]->get_interface_name());
+    EXPECT_EQ("RRBotSystemWithGPIO", state_interfaces[position]->get_prefix_name());
+  }
+
+  auto command_interfaces = system_hw.export_command_interfaces();
+  ASSERT_EQ(3u, command_interfaces.size());
+  {
+    auto [contains, position] =
+      test_components::vector_contains(command_interfaces, "joint1/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint1/velocity", command_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::HW_IF_VELOCITY, command_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint1", command_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(command_interfaces, "joint2/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint2/velocity", command_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::HW_IF_VELOCITY, command_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint2", command_interfaces[position]->get_prefix_name());
+  }
+  {
+    auto [contains, position] =
+      test_components::vector_contains(command_interfaces, "joint3/velocity");
+    EXPECT_TRUE(contains);
+    EXPECT_EQ("joint3/velocity", command_interfaces[position]->get_name());
+    EXPECT_EQ(
+      hardware_interface::HW_IF_VELOCITY, command_interfaces[position]->get_interface_name());
+    EXPECT_EQ("joint3", command_interfaces[position]->get_prefix_name());
+  }
+}
\ No newline at end of file