how to change Esim profile for nbiot fall back

[bhanu prakash]

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

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Faccess_uicc%2Faccess_uicc.html

Thank you

[bhanu prakash]

Hi

Didrik Rokhaug said:

To begin with, it might be a good idea to just verify that you can attach to the NB-IoT network, by only enabling NB-IoT with AT%XSYSTEMMODE=0,1,0,0

in my code its already configured when LTE not available its automatically changing to nb-iot

please see the below logs 

[00:07:39.458,343] <dbg> lte_lc.lte_lc_system_mode_set: Sending AT command to set system mode: AT%XSYSTEMMODE=0,1,0,0
11:28:19.213 -> +CEREG: 2
11:28:20.242 -> [00:08:13.738,037] <dbg> lte_lc.at_handler: +CEREG notification: +CEREG: 2
11:28:20.242 -> 
11:28:20.242 -> [00:08:13.738,128] <err> lte_lc: Could not get tracking area code, error: -22
11:28:20.242 -> [00:08:13.738,189] <err> lte_lc: Failed to parse notification (error -22): +CEREG: 2
11:28:20.242 -> 
11:28:38.644 -> %CESQ: 36,1,7,1
11:28:38.644 -> +CEREG: 2,"C2F0","00273265",9
11:28:38.644 -> LTE cell changed: Cell ID: 2568805, Tracking area: 49904
11:28:39.622 -> [00:08:33.144,134] <dbg> lte_lc.at_handler: +CEREG notification: +CEREG: 2,"C2F0","00273265",9
11:28:39.622 -> 
11:28:41.776 -> %CESQ: 34,1,0,0
11:28:41.962 -> +CSCON: 1
11:28:41.962 -> RRC mode: Connected
11:28:42.149 -> %CESQ: 35,1,5,0
11:28:42.149 -> +CEREG: 2,"C2F0","00273265",9,0,15
11:28:42.196 -> +CSCON: 0
11:28:42.196 -> RRC mode: Idle
11:28:42.616 -> %CESQ: 255,0,255,0
11:28:42.616 -> +CEREG: 2
11:28:42.942 -> [00:08:36.482,147] <dbg> lte_lc.at_handler: +CSCON notification
11:28:42.989 -> [00:08:36.700,225] <dbg> lte_lc.at_handler: +CEREG notification: +CEREG: 2,"C2F0","00273265",9,0,15
11:28:42.989 -> 
11:28:42.989 -> [00:08:36.741,516] <dbg> lte_lc.at_handler: +CSCON notification
11:28:42.989 -> [00:08:37.156,555] <dbg> lte_lc.at_handler: +CEREG notification: +CEREG: 2
11:28:42.989 -> 
11:28:42.989 -> [00:08:37.156,646] <err> lte_lc: Could not get tracking area code, error: -22
11:28:42.989 -> [00:08:37.156,707] <err> lte_lc: Failed to parse notification (error -22): +CEREG: 2
11:28:42.989 -> 
11:28:43.084 -> %CESQ: 37,1,8,1
11:29:00.636 -> 

Thank you

[Achim Kraus]

> AT+CSIM=14,80C2000009D3070202018110017D

According AT+CSIM Docu, the length is "The number of hexadecimal characters.". So it's rather 28 than 14. And the value is a string using "". I guess, it should be

AT+CSIM=28,"80C2000009D3070202018110017D"

[bhanu prakash]

Hi,

Achim Kraus said:

AT+CSIM=28,"80C2000009D3070202018110017D"

Thanks for the replay,

i have tried this method in LTE link monitor

when i send AT+CSIM=28,"80C2000009D3070202018110017D" below is the response logs  and LTE is show like in below 

AT+CSIM=28,"80C2000009D3070202018110017D"
+CSIM: 4,"980A"
OK

AT+CESQ
+CESQ: 99,99,255,255,255,255
OK
%CESQ: 34,1,18,2
+CGEV: ME PDN DEACT 0
AT+CGDCONT?
+CEREG: 0
+CIND: "service",0
+CIND: "roam",0+
CGEV: ME DETACH
OK
AT+CGACT?
OK
+CEREG: 2,"05D7","019C4600",7
AT+CESQ
+CESQ: 99,99,255,255,17,35
OK
+CGEV: ME PDN ACT 0,0
AT+CGDCONT?
+CNEC_ESM: 50,0
+CEREG: 5,"05D7","019C4600",7,,,"00000001","01011111"
+CIND: "service",1
+CIND: "roam",1
+CGDCONT: 0,"IP","eapn1.net","100.108.4.22",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK
+CNEC_ESM: 27,1

when i send AT+CSIM=28,"80C2000009D3070202018110017C" below is the response logs  and LTE is showing Green.

AT+CSIM=28,"80C2000009D3070202018110017C"
+CSIM: 4,"9809"
OK


AT+CESQ
+CESQ: 99,99,255,255,255,255
OK
%CESQ: 35,1,19,2
+CGEV: ME PDN DEACT 0
AT+CGDCONT?
+CEREG: 0
+CIND: "service",0
+CIND: "roam",0
+CGEV: ME DETACH
OK
AT+CGACT?
OK
+CEREG: 2,"05D7","019C4600",7
+CGEV: ME PDN ACT 0,0
AT+CGDCONT?
+CNEC_ESM: 50,0
+CEREG: 5,"05D7","019C4600",7,,,"00000001","01011111"
+CIND: "service",1
+CIND: "roam",1
+CGDCONT: 0,"IP","eapn1.net","100.108.4.62",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK
+CGEV: ME PDN ACT 1
AT
+CGDCONT?
+CGDCONT: 0,"IP","eapn1.net","100.108.4.62",0,0
+CGDCONT: 1,"IP","i-smsr.net","100.65.192.6",0,0
OK
AT+CGACT?
+CGACT: 0,1
+CGACT: 1,1
OK
+CGEV: ME PDN DEACT 1
+CNEC_ESM: 36,1
AT+CGDCONT?
+CGDCONT: 0,"IP","eapn1.net","100.108.4.62",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK

please check the both logs and let me know is profile switching happening or not for NB-IoT and LTE-M 

Thank you

[Achim Kraus]

> +CEREG: 2,"05D7","019C4600",7

AFAIK the "7" means LTE-M/CAT-M1. A "9" would be NB-IoT.

[bhanu prakash]

Hi,

In that case E-sim not switching the profile right ?

whats may the solution to switch the e-sim profile or need to send any command  for NB-IoT after switching the e-sim profile?

Thank you