Feature add rtttl frame

code/headers/frame_types.hpp

@@ -38,6 +38,7 @@ namespace r2d2 {
         COMMAND_ID,
         TEMPERATURE,
         GAS,
+        RTTTL_STRING,
         REQUEST_MAP_OBSTACLES,
         MAP_INFO,
         MAP_OBSTACLE,
@@ -628,6 +629,16 @@ namespace r2d2 {
     };
 
     /*
+    * @brief This is a frame that will be send to the sound module. 
+    * @details It contains a simple rtttl string 
+    * this was not my idea either 
+    */
+    R2D2_PACK_STRUCT
+    struct frame_rtttl_string_s {
+        // the rtttl string to be send 
+        char rtttl_string[248];
+    };
+    /* 
     * This frame will be sent from the navigation module.
     * Refer to the wiki for more information:
     * wiki page: https://github.com/R2D2-2019/R2D2-2019/wiki/Navigation
@@ -764,6 +775,12 @@ namespace r2d2 {
     )
 
     R2D2_INTERNAL_FRAME_HELPER(frame_temperature_s, TEMPERATURE)
+
+    R2D2_INTERNAL_FRAME_HELPER(
+            frame_rtttl_string_s, 
+            RTTTL_STRING,
+            R2D2_OPTIMISE_STRING(frame_rtttl_string_s, rtttl_string)
+        )
 
     R2D2_INTERNAL_FRAME_HELPER(
         frame_request_map_obstacles_s,