Figuring out functional state of nrf9160 modem

[chmielewskiandreas]

I hope someone can help me here with my question.

In my project we are using a nrf9160 with modem fw version 1.3.5. The application sends/receives data periodically (1 hour etc) using nB-Iot. Meanwhile it is in PSM.

We were running for several times in the last months/years into a modem state that it hangs and a connection can not be established. There were several reasons, previous modem firmware versions that were buggy etc etc (not only in my project) ... There is a fault handler implemented as I see which might help

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfxlib/nrf_modem/doc/fault_handling.html

The goal is to detect whether the modem is in a functional state and could connect if a connection can be established. Excepts the fault handler that directly signals a not functional state of the modem, are there any other ways how to detect whether the modem is functional? Sending AT-commands periodically? Unfortunately I did not see anything in the documentation.

Thanks!

Andreas

[Amanda Hsieh]

Hello,

Most of the staff is away for a long weekend in Norway, so there will be some delays in response time. Thanks for your patience.

[Hakon]

Hello,

Sending AT-commands periodically?

Yes, that's an option. Just check if the modem responds to at cmds. It's hard to say what is best way to handle it if you do not know what is causing it to hang like that.