GCS_MAVLink: static find_by_mavtype method

libraries/GCS_MAVLink/GCS.h

@@ -160,6 +160,12 @@ public:
     */
     static void send_to_components(const mavlink_message_t* msg) { routing.send_to_components(msg); }
 
+    /*
+      search for a component in the routing table with given mav_type and retrieve it's sysid, compid and channel
+      returns if a matching component is found
+     */
+    static bool find_by_mavtype(uint8_t mav_type, uint8_t &sysid, uint8_t &compid, mavlink_channel_t &channel) { return routing.find_by_mavtype(mav_type, sysid, compid, channel); }
+
 private:
     void        handleMessage(mavlink_message_t * msg);