Add user prop serialization and deserialization APIs

Author: AniruddhaKanhere

mqttFilePaths.cmake

@@ -12,7 +12,10 @@ set( MQTT_SOURCES
 
 # MQTT Serializer library source files.
 set( MQTT_SERIALIZER_SOURCES
-     "${CMAKE_CURRENT_LIST_DIR}/source/core_mqtt_serializer.c" )
+     "${CMAKE_CURRENT_LIST_DIR}/source/core_mqtt_serializer.c"
+     "${CMAKE_CURRENT_LIST_DIR}/source/core_mqtt_prop_serializer.c"
+     "${CMAKE_CURRENT_LIST_DIR}/source/core_mqtt_prop_deserializer.c"
+     "${CMAKE_CURRENT_LIST_DIR}/source/core_mqtt_serializer_private.c" )
 
 # MQTT library Public Include directories.
 set( MQTT_INCLUDE_PUBLIC_DIRS

source/core_mqtt.c

@@ -28,10 +28,16 @@
  */
 #include <string.h>
 #include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
 
 #include "core_mqtt.h"
+#include "core_mqtt_serializer.h"
+#include "transport_interface.h"
 #include "core_mqtt_state.h"
 
+#include "private/core_mqtt_serializer_private.h"
+
 /* Include config defaults header to get default values of configs. */
 #include "core_mqtt_config_defaults.h"
 
@@ -2702,6 +2708,7 @@ static MQTTStatus_t receiveConnack( MQTTContext_t * pContext,
                                     *pIncomingPacket,
                                     remainingTimeMs );
         }
+        /* TODO: Handle AUTH packets here as well. */
         else
         {
             LogError( ( "Incorrect packet type %X received while expecting"