I am trying to do some bench testing indoors. I can not get the Pixhawk (v3.3) to arm no matter what I try:
1) Disable prearm checks
2) Make all flight modes non-gps modes
3) Change GPS_TYPE to zero (meaning no gps)
4) Change AHRS_GPS_USE to zero
After (1) did not work (I verified that writing the parameters worked), I added on 2, 3, and 4. No luck. I still get one type or another of GPS errors (speed, whatever) when I try to arm. If I go outside (getting a good GPS signal), arming works.