I am reading Mavlink messages onto a display using an arduino. I can get all message except AUTOPILOT_VERSION is there anything extra required to get this message.
Thanks
David Ardis
Probably that message is not implemented in the ardupilot firmware.
Patches adding it to libraries/GCS_Mavlink/GCS_Mavlink.cpp are welcomed 
How does mission planner know what firmware is running on vehicle?
Please ask that in the mission Planner forum section.