As per the guide, I have disabled Mavlink. That has fixed the signal drop-outs - thanks @igor.vereninov.
To disable Mavlink over SSH:
- consult your RFD900 Data Sheet first, then
- ssh root@192.168.2.15
- screen /dev/ttyMFD2 57600
- +++
(modem will reply “OK” to indicate that you are in command mode) - RTS6=0
- RT&W
- RTO
- ATS6=0
- AT&W
- ATO
- CNTRL-a CNTRL-\ y
- exit
to also disable EEC, add in these commands above:
- RTS5=0
- ATS5=0
I’m still working on acquiring a good fix with the RFD900 radios. I have not disabled EEC yet, so I will try that next.
On another note, I was having trouble connecting to one Reach today (solid Green LED), so I power cycled it and I noticed it stuck with the solid Red LED. I ssh into the Reach and saw the bluetooth.service file was mysteriously wiped out again. So I copied bluetooth.service from another Reach unit, and all is well now.