Serial LTE Modem does not connect to the network on nRF9161

RE: Serial LTE Modem does not connect to the network on nRF9161

Øyvind — Fri, 23 May 2025 12:20:12 GMT

Hi Jan,

[quote user="Jan Kowalewski"][00:00:00.599,578] <err> nrf_cloud_info: Error requesting the IMEI: 65536[/quote]

Yes, that is most likely the issue. I'm glad you were able to find the root cause. Have you been able to add the IMEI?

KR,
Øyvind

RE: Serial LTE Modem does not connect to the network on nRF9161

Jan Kowalewski — Thu, 22 May 2025 09:18:27 GMT

I think I found the issue, I was not aware that nrf91 do not come with IMEI. I found the documentation: https://docs.nordicsemi.com/bundle/nrf-cloud/page/ImeiManagement/Ordering/OrderingImeis.html about this. I think this is the root cause.

BR,
Jan

RE: Serial LTE Modem does not connect to the network on nRF9161

Jan Kowalewski — Thu, 22 May 2025 08:59:36 GMT

Hello,

this is how it looks like on ctcc/nrf9161:

*** v3.7.99-ncs1 ***
[00:00:00.257,110] <inf> at_cmd_custom: Custom AT commands enabled with 70 entries.
[00:00:00.262,847] <inf> fs_nvs: 2 Sectors of 4096 bytes
[00:00:00.262,847] <inf> fs_nvs: alloc wra: 0, fe8
[00:00:00.262,878] <inf> fs_nvs: data wra: 0, 0
[00:00:00.507,171] <inf> slm: lib_modem init: 0
[00:00:00.507,232] <inf> mcuboot_util: Image index: 0, Swap type: none
[00:00:00.507,263] <inf> slm: Serial LTE Modem
[00:00:00.594,207] <inf> nrf_cloud_info: Device ID: 50334756-3437-41ee-80fa-1c1ee3c4454d
[00:00:00.599,578] <err> nrf_cloud_info: Error requesting the IMEI: 65536
Ready
[00:00:00.691,680] <inf> nrf_cloud_info: UUID: 50334756-3437-41ee-80fa-1c1ee3c4454d
[00:00:00.697,723] <inf> nrf_cloud_info: Modem FW: mfw_nrf91x1_2.0.1
[00:00:00.697,753] <inf> nrf_cloud_info: Protocol: MQTT
[00:00:00.697,784] <inf> nrf_cloud_info: Download protocol: HTTPS
[00:00:00.697,814] <inf> nrf_cloud_info: Sec tag: 16842753
[00:00:00.697,845] <inf> nrf_cloud_info: Host name: mqtt.nrfcloud.com
[00:00:00.697,937] <inf> slm_uart_handler: UART baud: 115200 d/p/s-bits: 3/0/1 HWFC: 0
[00:00:00.698,059] <inf> slm_at_host: at_host init done
> AT+CGDCONT=0,"IPV4V6","rh"

OK
> AT+CEREG=5

OK
> AT+CFUN=1

OK
> AT+CEREG?

+CEREG: 5,4

+CEREG: 2,"DED1","0288DA39",7
> AT+CEREG?

+CEREG: 5,2,"DED1","0288DA39",7

OK
> AT+CGDCONT?

+CGDCONT: 0,"IPV4V6","rh","",0,0

OK

I know it says 2.0.1 modem firmware, I tried to use previous version to see if there is a difference, but unfortunately not. I'm waiting like 30mins at least, what is strange that for nrf9160dk once it sees BTS it quite quickly registers to network.
What is interesting is this error regarding IMEI, on DK I don't have this error.

BR,

Jan

RE: Serial LTE Modem does not connect to the network on nRF9161

Øyvind — Mon, 19 May 2025 10:50:19 GMT

Hello Jan,

Could you please provide full Serial LTE Modem logs from the CTCC/nRF9161 HW?

[quote user=""]- AT+CGDCONT=0,"IP","rh"[/quote]

Any difference if you test with IPV4V6 – Virtual type of dual IP stack?

[quote user=""]And never connects to the internet,[/quote]

How long are you letting it try to connect to the network?

Thank you.

Kind regards,
Øyvind