Are you saying is that the Emlid Reach RTK doesn’t integrate completely with Pixhawk (Ardupilot) with long range radios and dual GPS?
Clarifications -So is your communication over serial with the SiK radio actually working or are you using TCP? -What did you alter in the code (ardupilot and/or reach)? How do I recompile reach code to the module? Is it a grueling task? -Have you tried flying with reach as primary and only GPS? What were your results?