nRF9160 LTE-M, SMS problems

[Babarskas]

Hello, I am not able to send sms, and probably connect to LTE-m. I am using at_client example, modem version mfw_nrf9160_1.3.0, nRF connect SDK v1.5.1, v1.6 tried on both.  

For sending message I am using this example https://devzone.nordicsemi.com/f/nordic-q-a/41755/sending-sms-using-at_client-example. 

> AT%XSYSTEMMODE=1,1,0,0
OK
> AT+CFUN=1
OK
> AT+CFUN?
OK
> AT+CNUM
+CME ERROR: 0
AT+CEREG?
+CEREG: 0,1,"19C8","09C4D267",9
OK

In this example for me CNUM always is error even though LTE link monitor shows all greens.

I live in Lithuania tried changing sim cards but can't get this working. Also if I use AT+CMGS I always get error 301. 

[Heidi]

Hi!

You're getting +CME error 0 (phone failure) from +CNUM and +CSM error 301 (SMS service of ME reserved) from +CMGS. 

I see you're connected to an NB-IoT cell.

Have you tried %XSYSTEMMODE=1,1,0,1, i.e specifying that LTE-M is your preferred connection protocol?

If you are able to take a modem trace that would help us get to the root of the issue.

Best regards,

Heidi

[Babarskas]

Sorry for late response but i am currently on vacation. However i tried your suggestion but result is still the same so I am sending Trace Collector .bin file to you. Am i correct to asume that i can't use this file for my own debuging because when i open it, text is unreadable.trace-2021-07-15T06-27-05.617Z.bin 

[Heidi]

Yes, you can't use this file as the tool to convert it into something readable isn't public.

I will have the modem team take a look at this trace.

Are you sure that the SIM card you're using is associated with a physical number?

[Babarskas]

Yes i used it with different manufacturer gsm/gnss module and everything works fine. 

[Heidi]

Hi,

Strangely, we can't find any SMS or AT-related traces for this issue in the log you provided.

1) Please make sure to run +CNMI before trying +CMGS, to register SMS client for AT.

2) Take a new log if you are still having issues.

[Heidi]

Hi! Were you able to take a new log?