Modem connection issues after reboots

RE: Modem connection issues after reboots

Didrik Rokhaug — Fri, 30 Jul 2021 09:26:23 GMT

Hi, and sorry for the late reply.

I believe the only way to reset the nRF9160 from software is via NVIC_SystemReset(), which will do a soft or warm reset.

Best regards,

Didrik

RE: Modem connection issues after reboots

Paul Kajdewicz — Fri, 23 Jul 2021 13:09:12 GMT

That has solved the problem. Thanks a lot for the fast answer!

But I have one question regarding the reboot behaviour:
From my understanding a COLD restart should invoke the same behaviour, as a power cycle, right?

It apparently does not behave the same way.

In addition to this, a software restart ends in the following function

void __weak sys_arch_reboot(int type)
{
       ARG_UNUSED(type);

       NVIC_SystemReset();
}

, which omits the WARM/COLD parameter. Is this still to be implemented?

RE: Modem connection issues after reboots

Didrik Rokhaug — Fri, 23 Jul 2021 12:13:24 GMT

Hi,

What modem FW version are you using?

If you are using mfw v1.3.0, it sounds like you have triggered the modem's reset loop detection.

If you subscribe to %MDMEV notifications, the modem will report that it has activated the reset loop restriction.

You can find more information in our nRF9160 Modem Reset Loop Restriction whitepaper and the AT command reference.

Best regards,

Didrik