The modem restarts after sending the command AT+CFUN=1

[Yury Morgunov]

Hi, 

When running the at_client example, I send the AT+CFUN=1 command via the LTE link monitor. After a few seconds, the nrf9160 reboots.

I want to say that before my program worked and connected to the server. However, now I cannot even work through at_client. Commands like AT+CGMR work

If I pull out the sim card, the nrf9160 will not restart. What could be the problem?

P.S. I tried to get modem trace but tace collecor is not accepting anything. Are there any other ways to debug this problem?

Modem firmware version - mfw_nrf9160_1.1.0
I use nRF Connect SDK v1.3.0

[Yury Morgunov]

I apologize for the long answer, for some reason I stopped receiving notifications.

I have done what you asked.

After starting the command was sent:

AT+CFUN? 
+CFUN: 0 
OK

Then I pressed reset and sent the following command:

AT+CFUN=1 
OK

Waited for the device to restart and stopped the tracer

here is trace.bin:

trace-2020-08-19T12-39-39.333Z.bin

Here's the log if needed:

Fullscreen 2020-08-19T12_39_23.258Z-log.txt Download

2020-08-19T12:39:24.871Z INFO Application data folder: C:\Users\y.morgunov\AppData\Roaming\nrfconnect\pc-nrfconnect-tracecollector
2020-08-19T12:39:24.972Z DEBUG App pc-nrfconnect-tracecollector v1.0.3 official
2020-08-19T12:39:24.972Z DEBUG App path: C:\Users\y.morgunov\.nrfconnect-apps\node_modules\pc-nrfconnect-tracecollector
2020-08-19T12:39:24.972Z DEBUG nRFConnect 3.4.2 is supported by the app (^3.0.0)
2020-08-19T12:39:24.972Z DEBUG nRFConnect path: C:\Users\y.morgunov\AppData\Local\Programs\nrfconnect\resources\app.asar
2020-08-19T12:39:24.972Z DEBUG HomeDir: C:\Users\y.morgunov
2020-08-19T12:39:24.972Z DEBUG TmpDir: C:\Users\YDBE4~1.MOR\AppData\Local\Temp
2020-08-19T12:39:24.978Z VERBOSE Could not fetch serial number for serial port at COM1
2020-08-19T12:39:24.979Z VERBOSE Could not fetch serial number for serial port at COM20
2020-08-19T12:39:30.195Z INFO Device opened
2020-08-19T12:39:39.335Z INFO Tracefile created: C:\Users\y.morgunov\AppData\Roaming\nrfconnect\pc-nrfconnect-tracecollector\trace-2020-08-19T12-39-39.333Z.bin
2020-08-19T12:40:16.773Z INFO Tracefile closed

[Martin Lesund]

Hi Yury,
I was hoping you could share the full serial output of the responses when running the at_client.

Please try to redo the modem trace, it was invalid. (only 1Kb)

[Yury Morgunov]

Hi Martin,

I'm sorry, but I don't quite understand what you mean. I sent a trace when the modem crashes, is that not enough?

[Martin Lesund]

Hi Yury,
The modem trace you sent (.bin file) was empty. 
Please make sure you have followed the guide correctly: https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/how-to-get-modem-trace-using-trace-collector-in-nrf-connect

Also what I mean by serial output, is the actual logging from the application. (This can be seen from the LTE Link Monitor or just a serial output terminal)

[Yury Morgunov]

I remember exactly that Tace size was not equal to 0, maybe I accidentally sent the wrong file ...
Here's another one. Trace size = 334 B

trace-2020-08-25T10-18-52.520Z.bin