Fix Ardupilot ExternalNav Integration -- 2

I’m running an ExternalNav pipeline that takes UWB data through a Raspberry Pi 5, packages it as MAVLink VISION_POSITION_ESTIMATE messages, and feeds it into ArduPilot. Somewhere along that path the position information degrades and the vehicle refuses to accept the estimates... (Budget: $40 - $42 USD, Jobs: C++ Programming, Debugging, Electronics, Embedded Systems, Firmware Development, Microcontroller, Python, Signal Processing)