MAVLink app: Add option to configure broadcast, default to off

src/modules/mavlink/mavlink_params.c

@@ -99,6 +99,18 @@ PARAM_DEFINE_INT32(MAV_USEHILGPS, 0);
  */
 PARAM_DEFINE_INT32(MAV_FWDEXTSP, 1);
 
+/**
+ * Broadcast heartbeats on local network
+ *
+ * This allows a ground control station to automatically find the drone
+ * on the local network.
+ *
+ * @value 0 Never broadcast
+ * @value 1 Always broadcast
+ * @group MAVLink
+ */
+PARAM_DEFINE_INT32(MAV_BROADCAST, 0);
+
 /**
  * Test parameter
  *