"I am getting the heartbeat package from APM board now. However, all I got was #0 and #253 pack. Even after I send out mavlink_msg_request_data_stream_pack."
Thank you for your reply. How should connect the wires? TX from APM telemetry to RX on Arudino and RX form APM telemetry to TX Arduino?
Cuz when I do it that way, serial.avaible() on Arudino side never received anything.
I am very new to mavlink communication and I have couple of questions about communicating between APM and Arduino Uno (or Mega). Does APM board send out heartbeat message automatically? If so, should I able to catch it in Arduino IDE's serial…