Hi,
I'm using nrf9160custom board using sdk version 2.0.0
our Esim has 2 profiles one is for LTE and another one is for NB-IoT. Present i have tested tested LTE network and its working fine but i need to work on NB-IoT.
i have no idea how to do fallback for LTE to NB-IoT.
our Esim provider given fallback APDU command.
i have refered below document too but i don't have any how to send AT+CSIM command
Thank you
Hi,
Which modem FW version are you using?
Have you tried to just set the system modem to NB-IoT or LTE-M and NB-IoT, to see if the modem handles it automatically?
You can find the documentation on how to send AT commands from the application here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.3.0/nrfxlib/nrf_modem/doc/at_interface.html
Best regards,
Didrik
Hi,
Which modem FW version are you using?
I'm using FW version 1.3.4
Have you tried to just set the system modem to NB-IoT or LTE-M and NB-IoT, to see if the modem handles it automatically?
Before we using plastic sim card in that we have implemented he NB-IoT fallback and its working fine but now we are using ESIM instead of plastic sim .Now our ESIM have 2 profiles one is for LTE and another one is NB-IoT.
so if i need to using NB-IoT fallback first i have to change the profile. so how i can change the ESIM profile?
our Esim providers proved APDU command for fallback. i have tried "AT+CSIM" command for fallback but i don't either it changes or not. how i can i check either it change or not?
if you need i can provide ESIM document for your reference.
Thank you
I just noticed that in your nbiot_connect AT command, you set the Act to 7, meaning LTE-M. What happens if you set it to 9 instead?
i haven't check that i will check and update you ASAP
HI
I just noticed that in your nbiot_connect AT command, you set the Act to 7, meaning LTE-M. What happens if you set it to 9 instead?
i have tried by changing "9" when i change its not even resister to the network and system mode is in NBIOT
please check the below logs when modem is in both LET and NB-IoT mode
> at%xsystemmode? %XSYSTEMMODE: 1,0,0,0 > AT+COPS=? +COPS: (2,"","","26201",7),(1,"","","26203",7),(1,"","","26202",7) OK > at+cops? +COPS: 0,2,"26201",7 OK > at+cereg? +CEREG: 5,5,"05D7","019C4600",7,,,"00000001","01011111" OK > at+cfun=0 OK > at%xsystemmode=0,1,0,0 OK > at+cfun=1 OK > at+cereg? +CEREG: 0,4 OK > at+cereg? +CEREG: 0,2,"089A","0052C0DF",9 OK > ATCOPS=? +COPS: (1,"","","26203",9),(1,"","","26201",9),(1,"","","26202",9) OK > at+cereg? +CEREG: 0,2,"C2F0","00273265",9 OK > at+cops=0,2,"26203",9 OK > at+cops? +COPS: 0 OK > at+cereg? +CEREG: 0,2 OK > at+cgdcont? +CGDCONT: 0,"","","",0,0 OK > at+cereg? +CEREG: 0,2 OK
could you take a modem trace, where you try to change the SIM profile and connect to NB-IoT?
Hi,
i can't able to take modem trace due to its custom board and we don't have any other uart port available
+COPS: (2,"","","26201",7),(1,"","","26203",7),(1,"","","26202",7)
based on this i have total 3 networks. by default its connecting to "26201" if i want to connect to another network which is "26203" how i can connect to it?
You can select the PLMN manually with +COPS.
If the first argument is 1, manual network selection will be used.
However, you should be aware that this prevents the modem from connecting to any other network, so if you move out of the given networks coverage, but there are other networks that the modem could connect to, it will not connect to those.
You can select the PLMN manually with +COPS.
If the first argument is 1, manual network selection will be used.
However, you should be aware that this prevents the modem from connecting to any other network, so if you move out of the given networks coverage, but there are other networks that the modem could connect to, it will not connect to those.
Hi,
Thanks for the reply,
+COPS: (2,"","","26201",7),(1,"","","26203",7),(1,"","","26202",7)
based on this l observed our e-sim don't have nb-iot profile network right? please correct if i'm wrong
i send at+cops=? command when nRF9160 is in LTE mode.
bhanu prakash said:i send at+cops=? command when nRF9160 is in LTE mode.
If you only had LTE-M enabled (%XSYSTEMMODE=1,0,0,0), the modem will only search for LTE-M networks. Regardless of what the SIM card supports.
Hi,
If you only had LTE-M enabled (%XSYSTEMMODE=1,0,0,0), the modem will only search for LTE-M networks. Regardless of what the SIM card supports.
i have tried with NB-IoT enable too i that moment i'm got error msg then i got all same networks with mode "9"
+COPS: (1,"","","26202",9),(1,"","","26203",9),(1,"","","26201",9) +CME ERROR: 521
bhanu prakash said:i have tried with NB-IoT enable too
Did you have both modes enabled, or just NB-IoT?
CME error 521 means "PLMN search interrupted, partial results"
Did you have both modes enabled, or just NB-IoT?
i enable only NB-IoT mode using command at%xsystemmode=0,1,0,0
