GCS_MAVLink: make sending of send_pid_tuning up

libraries/GCS_MAVLink/GCS.h

@@ -196,6 +196,7 @@ public:
     virtual void send_rangefinder() const;
     void send_proximity() const;
     virtual void send_nav_controller_output() const = 0;
+    virtual void send_pid_tuning() = 0;
     void send_ahrs2();
     void send_ahrs3();
     void send_system_time();

libraries/GCS_MAVLink/GCS_Common.cpp

@@ -4137,6 +4137,11 @@ bool GCS_MAVLINK::try_send_message(const enum ap_message id)
         send_ahrs3();
         break;
 
+    case MSG_PID_TUNING:
+        CHECK_PAYLOAD_SIZE(PID_TUNING);
+        send_pid_tuning();
+        break;
+
     case MSG_NAV_CONTROLLER_OUTPUT:
         CHECK_PAYLOAD_SIZE(NAV_CONTROLLER_OUTPUT);
         send_nav_controller_output();

libraries/GCS_MAVLink/GCS_Dummy.h

@@ -37,6 +37,7 @@ protected:
     bool set_home(const Location& loc, bool lock) override { return false; }
 
     void send_nav_controller_output() const override {};
+    void send_pid_tuning() override {};
 };
 
 /*

libraries/GCS_MAVLink/examples/routing/routing.cpp

@@ -39,6 +39,7 @@ protected:
     uint32_t custom_mode() const override { return 3; } // magic number
     MAV_STATE system_status() const override { return MAV_STATE_CALIBRATING; }
     void send_nav_controller_output() const override {};
+    void send_pid_tuning() override {};
 
     bool set_home_to_current_location(bool lock) override { return false; }
     bool set_home(const Location& loc, bool lock) override { return false; }