Reorganize mqtt build structure

- Integrate build definitions from idf
- Changes CMakeLists to allow import
- Added host test from idf
- Added test code from idf

CMakeLists.txt

@@ -0,0 +1,18 @@
+set(srcs mqtt_client.c lib/mqtt_msg.c lib/mqtt_outbox.c lib/platform_esp32_idf.c)
+
+if(CONFIG_MQTT_PROTOCOL_5)
+    list(APPEND srcs lib/mqtt5_msg.c mqtt5_client.c)
+endif()
+
+list(TRANSFORM srcs PREPEND ${CMAKE_CURRENT_LIST_DIR}/)
+idf_component_register(SRCS "${srcs}"
+                    INCLUDE_DIRS ${CMAKE_CURRENT_LIST_DIR}/include
+                    PRIV_INCLUDE_DIRS ${CMAKE_CURRENT_LIST_DIR}/lib/include
+                    REQUIRES esp_event tcp_transport
+                    PRIV_REQUIRES esp_timer http_parser esp_hw_support heap
+                    KCONFIG ${CMAKE_CURRENT_LIST_DIR}/Kconfig
+                    )
+target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")
+
+
+

components/mqtt/Kconfig → Kconfig

@@ -124,6 +124,13 @@ menu "ESP-MQTT Configurations"
         help
             MQTT task priority. Higher number denotes higher priority.
 
+    config MQTT_EVENT_QUEUE_SIZE
+        int "Number of queued events."
+        default 1
+        depends on MQTT_USE_CUSTOM_CONFIG
+        help
+            A value higher than 1 enables multiple queued events.
+
     config MQTT_TASK_CORE_SELECTION_ENABLED
         bool "Enable MQTT task core selection"
         help