PrecisionHawk Lancaster Rev5

Does anyone here have experience working with the PrecisionHawk Lancaster Rev 5 and Mission Planner? Since PrecisionHawk deprecated their own planning and control software, Mission Planner is the only thing they can suggest. While I can get it to connect over radio modem to the aircraft, it doesn’t seem to be communicating fully. Can’t read/write waypoints, Arm/Disarm message wrong, etc. Until I can get consistent, predictable communications, there’s no chance that I’ll launch with it.

Thanks for any help,