RTK Express drops from casting to xmitting and does not automatically reconnect

[blubbi321]

Subject of the issue

Im seeing issues similar to https://github.com/sparkfun/SparkFun_RTK_Firmware/issues/257 :

Setup: RTK Express (as a base) <-> Wifi <-> Mobile Phone Hotspot <-> RTK2Go

Symptom is that the Express randomly drops from casting into xmitting and never recovers back into casting on its own. When manually restarted, it will go into casting again, after surveying in, which eats a lot of time and is not acceptable for our usecase.

Since the setting is very remote, the mobile connection can have quite some delays. This is what I currently blame the problems on.

However, I could reproduce the issue by just shutting down the mobile phone - therefore I would assume the problems at least partly also stem from the RTK Express.

Your workbench

• What version of RTK firmware are you running? https://github.com/sparkfun/SparkFun_RTK_Firmware_Binaries/blob/main/RTK_Surveyor_Firmware_RC-Jan_19_2024.bin
• What radios are you using: WiFi; Are you transmitting NTRIP back to the device? No

Steps to reproduce

See above.

I will provide the serial logs ASAP

Expected behavior

I would expect the Express to do incremental reconnects to RTK2Go to avoid getting blocked, but at the same time keep the rtcm stream flowing as much as possible.

Actual behavior

Device drops into xmitting and does not recover