Mavlink Very unreliable over Xbees

Hi,Running APM 2.1 and the latest build of APM planner (according to update facilty in Planner).Xbees are 868s.Mavlink works great over USB but I get no end of exceptions over Xbees.The Xbees are working fine (they definately are connected and working and have flown many times on APM 1.x with a GCS). When I try to PID config or load a mission over the Xbee Mavlink I get 'expected 0 got 92' type errors (I can upload screenshots).Xbees have been the same on 9600 and 38400 baud.Any help appreciated. I would have thought Mavlink would have been very robust against less than perfect connection due to its intended purpose, but this seems not to be the case.CheersD

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  • The RF data rate is limited to 10% in Europe which effectively gives a 24Kbs throughput rate. I can only suggest you try them at a serial rate of 19200 (change the config and Xbee serial settings).

     

    The 2.4GHz Xbees do not have this limitation.

     

    Peter 

  • Developer

    Davey,

     

    I have been running 900Mhz at 56k and 2.4Ghz at 34k xbees with APM2.X without significant problem.

     

    "Expected 0 got 92" sounds like a strange error message.  I do occasionally (<20%) get a failure on the parameter download, which is about the most stressful event for the APM/Mavlink/GCS system, but the error message is typically something like "expected 92 got 90".  Which GCS are you using?

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