nrf9160 modem fault

RE: nrf9160 modem fault

dejans — Tue, 09 Jul 2024 14:15:56 GMT

Hi,

Can you provide any additional information about your application?

Can you share your complete log which shows modem fault?

Modem trace could be very useful. I am aware that it might be difficult for you to obtain it (as you said previously), but it could provide important information for error analysis. If possible, please provide modem trace in addition to the full log.

Best regards,
Dejan

RE: nrf9160 modem fault

miked531 — Tue, 09 Jul 2024 02:32:12 GMT

It's hard to tell how often it occurs. I just recently put in additional logging to help get a feeling for it. My best guess based on the symptoms (GNSS no longer getting fixes) it is in the range of 3-4 days, with fixes every 4 hours.

I am not using LTE and there is no SIM card plugged either. These are the commands used when the device boots:

[00:00:00.977,203] <inf> nrf_modem: Initializing libmodem 2.5.0-lte-5ccd2d4dd54c
[00:00:01.208,618] <inf> nrf_modem: RPC ready
[00:00:01.222,961] <inf> modem: atcmd AT+CMEE=1 -> OK
[00:00:01.223,541] <inf> modem: atcmd AT+CGMR -> mfw_nrf9160_1.3.4
[00:00:01.224,151] <inf> modem: atcmd AT+CGSN -> 351901936539968
[00:00:01.224,700] <inf> modem: atcmd AT+CFUN? -> +CFUN: 0
[00:00:01.225,372] <inf> modem: atcmd AT%XSYSTEMMODE? -> %XSYSTEMMODE: 0,0,1,0
[00:00:01.225,952] <inf> modem: atcmd AT+CGMI -> Nordic Semiconductor ASA
[00:00:01.226,593] <inf> modem: atcmd AT+CGMM -> nRF9160-SICA
[00:00:01.227,325] <inf> modem: atcmd AT%HWVERSION -> %HWVERSION: nRF9160 SICA B1A
[00:00:01.227,935] <inf> modem: atcmd AT%XCOEX0 -> OK
[00:00:01.229,431] <inf> modem: atcmd AT%XSYSTEMMODE=0,0,1,0 -> OK
[00:00:01.235,565] <inf> modem: atcmd AT+CFUN=31 -> OK
[00:00:01.236,206] <inf> modem: atcmd AT+CPSMS=1,"","","","" -> OK
[00:00:01.236,877] <inf> modem: atcmd AT+CEPPI=1 -> OK
[00:00:01.236,999] <inf> gnss: starting gnss
[00:00:01.247,253] <inf> nrf_modem: GNSS notification API version 2

RE: nrf9160 modem fault

dejans — Mon, 08 Jul 2024 14:28:47 GMT

Hi,

On how many devices did this fault occur?

How rare is this "rare occurrence"? Is there any periodicity to this fault? Is the issue reproducible?

Which network operator do you use? Do you use LTE-M or NB-IoT?

Best regards,
Dejan