add FTP client (#291)

* migrate FTP from matth-x/MicroFtp

* fix compilation errors

* add extra switch or certs store

* fix disable MbedTLS by default

* add FTP client to CMakeLists

* add FTP client to CMakeLists II

CMakeLists.txt

@@ -13,6 +13,7 @@ set(MO_SRC
     src/MicroOcpp/Core/ConfigurationKeyValue.cpp
     src/MicroOcpp/Core/FilesystemAdapter.cpp
     src/MicroOcpp/Core/FilesystemUtils.cpp
+    src/MicroOcpp/Core/FtpMbedTLS.cpp
     src/MicroOcpp/Core/RequestQueue.cpp
     src/MicroOcpp/Core/Context.cpp
     src/MicroOcpp/Core/Operation.cpp

src/MicroOcpp.cpp

@@ -313,7 +313,7 @@ void mocpp_initialize(Connection& connection, const char *bootNotificationCreden
     if (certStore) {
         certStoreUse = std::move(certStore);
     }
-#if MO_ENABLE_MBEDTLS
+#if MO_ENABLE_MBEDTLS && MO_ENABLE_CERT_STORE_MBEDTLS
     else {
         certStoreUse = makeCertificateStoreMbedTLS(filesystem);
     }

src/MicroOcpp/Core/Ftp.h

@@ -0,0 +1,86 @@
+// matth-x/MicroOcpp
+// Copyright Matthias Akstaller 2019 - 2024
+// MIT License
+
+#ifndef MO_FTP_H
+#define MO_FTP_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct ocpp_ftp_download {
+    void *user_data; //set this at your choice. MO passes it back to the functions below
+
+    void (*loop)(void *user_data);
+} ocpp_ftp_download;
+
+typedef struct ocpp_ftp_upload {
+    void *user_data; //set this at your choice. MO passes it back to the functions below
+
+    void (*loop)(void *user_data);
+} ocpp_ftp_upload;
+
+typedef struct ocpp_ftp_client {
+    void *user_data; //set this at your choice. MO passes it back to the functions below
+
+    void (*loop)(void *user_data);
+
+    ocpp_ftp_download* (*get_file)(void *user_data,
+        const char *ftp_url, // ftp[s]://[user[:pass]@]host[:port][/directory]/filename
+        size_t (*file_writer)(void *mo_data, unsigned char *data, size_t len),
+        void (*on_close)(void *mo_data),
+        void *mo_data,
+        const char *ca_cert); // nullptr to disable cert check; will be ignored for non-TLS connections
+
+    void (*get_file_free)(void *user_data, ocpp_ftp_download*);
+
+    ocpp_ftp_upload* (*post_file)(void *user_data,
+        const char *ftp_url, // ftp[s]://[user[:pass]@]host[:port][/directory]/filename
+        size_t (*file_reader)(void *mo_data, unsigned char *buf, size_t bufsize),
+        void (*on_close)(void *mo_data),
+        void *mo_data,
+        const char *ca_cert); // nullptr to disable cert check; will be ignored for non-TLS connections
+
+    void (*post_file_free)(void *user_data, ocpp_ftp_upload*);
+} ocpp_ftp_client;
+
+#ifdef __cplusplus
+} //extern "C"
+
+#include <memory>
+#include <functional>
+
+namespace MicroOcpp {
+
+class FtpDownload {
+public:
+    virtual void loop() = 0;
+};
+
+class FtpUpload {
+public:
+    virtual void loop() = 0;
+};
+
+class FtpClient {
+public:
+
+    virtual std::unique_ptr<FtpDownload> getFile(
+                const char *ftp_url, // ftp[s]://[user[:pass]@]host[:port][/directory]/filename
+                std::function<size_t(unsigned char *data, size_t len)> fileWriter,
+                std::function<void()> onClose,
+                const char *ca_cert = nullptr) = 0; // nullptr to disable cert check; will be ignored for non-TLS connections
+
+    virtual std::unique_ptr<FtpUpload> postFile(
+                const char *ftp_url, // ftp[s]://[user[:pass]@]host[:port][/directory]/filename
+                std::function<size_t(unsigned char *out, size_t buffsize)> fileReader, //write at most buffsize bytes into out-buffer. Return number of bytes written
+                std::function<void()> onClose,
+                const char *ca_cert = nullptr) = 0; // nullptr to disable cert check; will be ignored for non-TLS connections
+};
+
+} // namespace MicroOcpp
+#endif //def __cplusplus
+#endif