nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

Michal — Tue, 29 Oct 2024 17:15:02 GMT

Thank you for the update. Crossing fingers that this is the case

Best regards,

Michal

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

jstuewe — Mon, 28 Oct 2024 04:49:00 GMT

It's been a while and I haven't seen this issue since I powered the modem off before rebooting. I think that fixed it.

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

jstuewe — Thu, 29 Aug 2024 13:49:21 GMT

No. I don't know how that got checked.
It's not an error that I see every day or even every week so I won't know if this fixes it for quite a while.

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

Michal — Tue, 27 Aug 2024 17:49:28 GMT

Did you mean to mark the answer as suggested?

Please let me know if you can still reproduce the error then.

Best regards,

Michal

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

jstuewe — Sun, 25 Aug 2024 05:03:55 GMT

I think it's the application core. I'm setting up a 2 minute WDT using Zepher commands:

wdt_config.flags = WDT_FLAG_RESET_SOC

wdt_config.window.max = 120000u

wdt_install_timeout(wdt_dev, &wdt_config);

wdt_setup(wdt_dev, WDT_OPT_PAUSE_HALTED_BY_DBG);

I'm calling lte_lc_power_off() from deps/nrf/lib/lte_link_control/lte_lc.c which calls:

lte_lc_func_mode_set(LTE_LC_FUNC_MODE_POWER_OFF) ? -EFAULT : 0;

I went through my code and there were several places I re-booted without calling this. I added them this and will see if I can still re-produce the error.

* Golioth SDK: 0.13.1
* nRF Connect SDK: v2.5.2
* Zephyr version: 3.5.1
* Cellular Modem firmware version: mfw_nrf9160_1.3.6

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

Michal — Thu, 22 Aug 2024 18:52:51 GMT

Is your WDT reset done on the application core?

You may try to play around with lte_lc_func_mode() function and nrf_modem_shutdown().

As for the modem not working after several WDT resets you may want to look into Modem Reset Loop Restriction.

By the way, what is your Modem FW version? What about NCS?

Best regards,

Michal

RE: nRF9160 cellular modem connection issue fixed by power cycle, but not a reset.

Michal — Wed, 21 Aug 2024 21:52:33 GMT

Hello,

I will look more into it and get back to you before the end of the week.

Best regards,

Michal