[NRF9151] Modem does not connect after SIM deactivate/reactivate

[Mlgr]

Hi,

I’m using the Thingy:91X board with the nRF9151 chip, modem firmware version 2.0.2, and SDK version 2.9.0.

We’re encountering a serious issue: the modem does not reconnect after the SIM has been deactivated and then reactivated.

I’ve tried:

• sys_reboot(SYS_REBOOT_COLD)

• Placing the modem offline (lte_lc_offline())

• Shutting down the modem library (nrf_modem_lib_shutdown())

• Forcing a hard reboot via the watchdog

None of these approaches has worked.

Do you have any suggestions for resolving this issue?

The only workaround so far (which isn’t acceptable) is to manually power the device off and on.

Regards,
Mathieu

[Achim Kraus]

Not sure, how you really tested that.

There may be two pitfalls:

- the reactivation of the SIM may take some time (in some cases more minutes, even longer, especially, if you deactivate and reactivate multiple times in just a few minutes)

- some rejection cause are treated "sticky" by the modem. That requires usually to wait some time or do a "lte_lc_power_off/lte_lc_normal" cycle (but I didn't retest that for a nRF9151)

So, let me propose, that you try to wait a minute or so after reactivate the SIM until you test to connect the modem again. If that results in rejected registrations, then try a "lte_lc_power_off/lte_lc_normal" cycle.

[Mlgr]

Hello Achim,

I let the card run for a few days, but it never reconnected to the network. However, I have a watchdog that reboots the card after “x” minutes without data. Should I disable it? Could it be causing a conflict with the modem in the new version?

I already tried the lte_lc_power_off/lte_lc_normal cycle, but it didn’t work (the watchdog still rebooted the card after a few minutes).

Best regards,
Mathieu

[dejans]

Hi Mathieu,

Have you made some progress?

Have you been able to capture modem trace, possibly following Achim's suggestion using modem trace snippet?

Which mobile network operator does your device connect to?

Due to frequent rebooting via watchdog, it could be that reset loop restriction was triggered.

Best regards,
Dejan

[Jon]

Hi !

We were not really able to make some progress. 

We were not able to get modem traces. I was not able to do it with UART1, since the uart1 is used for other purposes, and the connectivy_bridge is not used anymore. That's why we redirect all our app uart to RTT.

So, i tried to use the RTT modem trace snippet. 
I also get the -63 error.



By the way, i get nothing on channel 2, about modem traces. It remains empty

Here is the command i used to build

of course, i used the link given for the snippet.

Well, it seems i won't be able to get some modem traces :)

About the operator, i tried with a Onomondo sim until now.   My device connects to Bouygues Telecom Network (by using onomondo or Tele2).

Tomorrow, i will check with some TELE2 sim, and a brand new Thingy91X. I'll give you more infos then.

[dejans]

Hi,

For additional information about capturing modem traces, you can refer to these links in documentation
modem tracing and capturing modem trace using Cellular Monitor.

Jon said:

Tomorrow, i will check with some TELE2 sim, and a brand new Thingy91X. I'll give you more infos then.

I am looking forward to your update.

Best regards,
Dejan

[Jon]

Hi,

Here are some news :)
We were not able to plug our app with the tracing tools. But we are really stuck, so we changed our approch.

We reproduced the problem by using the Nordic modem shell example.

You will find attach all the command we did.  At the beginning, we are able to reach the network, we generate the problem by deactivating the sim and reactivating it later after having  done a at+CFUN=0 and at+CFUN1 (2/3 minutes after), 

By the end of the file, you can see we tried several stuff to connect but it never work. 

THe only way to reach the network again is by power cycling the thingy91x

What are your thoughts ?

Fullscreen serial-terminal-06082025_165918.txt Download

> at AT+CFUN=1
at AT+CFUN=1
OK
mosh:~$ > at AT%XCONNSTAT=1
at AT%XCONNSTAT=1
OK
mosh:~$ > at AT%XCONNSTAT?
at AT%XCONNSTAT?
%XCONNSTAT: 0,0,0,0,0,0
OK
mosh:~$ > at AT+CMEE=1
at AT+CMEE=1
OK
mosh:~$ > at AT%XSIM=1
at AT%XSIM=1
OK
mosh:~$ > at AT+CEREG=5
at AT+CEREG=5
OK
mosh:~$ > at AT%MDMEV=1
at AT%MDMEV=1
OK
mosh:~$ > at AT%CESQ=1
at AT%CESQ=1
OK
mosh:~$ > at AT+CGSN=1
at AT+CGSN=1
+CGSN: "359404230274905"
OK
mosh:~$ > at AT+CGMM
at AT+CGMM
nRF9151-LACA
OK
mosh:~$ > at AT+CEMODE?
at AT+CEMODE?
+CEMODE: 2
OK
mosh:~$ > at AT+CMEE?
jH AT+CMEE?+SQ
mosh:~$ at AT+CNEC?> at AT+CNEC?
H+CNEC: 16
OK
mosh:~$ > at AT+CGEREP?
at AT+CGEREP?
+CGEREP: 1,0
OK
mosh:~$ > at AT+CIND=1,1,1
at AT+CIND=1,1,1
OK
mosh:~$ > at AT+COPS=3,2
at AT+COPS=3,2
OK
mosh:~$ > at AT+CGDCONT?
at AT+CGDCONT?
OK
mosh:~$ > at AT+CGACT?
at AT+CGACT?
OK
mosh:~$ > at AT+CESQ
at AT+CESQ
+CESQ: 99,99,255,255,255,255
OK
mosh:~$ > at AT%XSIM?
at AT%XSIM?
%XSIM: 1
OK
mosh:~$ > at AT+CPIN?
at AT+CPIN?H+CPIN: READY
OK
mosh:~$ > at AT+CIMI
at AT+CIMI
240075823634698
OK
mosh:~$ > at AT+CNEC=24
at AT+CNEC=24
OK
mosh:~$ > at AT+CEER
at AT+CEER
OK
mosh:~$ > at AT+CGEREP=1
at AT+CGEREP=1
Network registration status: searching
OK
Currently active system mode: LTE-M
RRC mode: Connected
mosh:~$ > at AT%XPOFWARN=1,30
at AT%XPOFWARN=1,30
LTE cell changed: ID: 25533958, Tracking area: 52644
OK
mosh:~$ > at AT%XVBATLVL=1
at AT%XVBATLVL=1
OK
mosh:~$ > at AT+CGMI
at AT+CGMI
Nordic Semiconductor ASA
OK
mosh:~$ > at AT+CGMR
at AT+CGMR
mfw_nrf91x1_2.0.2
OK
mosh:~$ > at AT+CGSN
at AT+CGSN
359404230274905
OK
mosh:~$ > at AT%XMODEMUUID
at AT%XMODEMUUID
%XMODEMUUID: 320176d5-9f40-45fc-923b-2661ec18d547
OK
mosh:~$ > at AT%XDATAPRFL?
at AT%XDATAPRFL?
%XDATAPRFL: 2
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 5,2,"CDA4","01859E06",7
OK
mosh:~$ > at AT+CFUN?
at AT+CFUN?
+CFUN: 1
OK
mosh:~$ > at AT%CESQ=1
at AT%CESQ=1
OK
mosh:~$ > at AT+CSCON=1
at AT+CSCON=1
OK
mosh:~$ > at AT+CSCON?
at AT+CSCON?
+CSCON: 1,1
OK
mosh:~$ > at AT+CPAS
at AT+CPAS
+CPAS: 0
OK
mosh:~$ > at AT+CEDRXRDP
at AT+CEDRXRDP
+CEDRXRDP: 0
OK
mosh:~$ > at AT%XTIME=1
at AT%XTIME=1
OK
mosh:~$ > at AT%CONEVAL
at AT%CONEVAL
%CONEVAL: 6
OK
mosh:~$ > at AT%XCBAND=?
at AT%XCBAND=?
%XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66,85)
OK
mosh:~$ > at AT%XCBAND
at AT%XCBAND
%XCBAND: 20
OK
mosh:~$ > at AT%HWVERSION
at AT%HWVERSION
%HWVERSION: nRF9151 LACA A0A
OK
mosh:~$ > at AT%XMODEMTRACE=1,2
at AT%XMODEMTRACE=1,2
OK
mosh:~$ > at AT%XSYSTEMMODE?
at AT%XSYSTEMMODE?
%XSYSTEMMODE: 1,1,1,3
OK
mosh:~$ > at AT%XICCID
at AT%XICCID
%XICCID: 89462038075015721859
OK
mosh:~$ > at AT%XEMPR?
at AT%XEMPR?
%XEMPR:
OK
mosh:~$ > at AT+CGDCONT?
at AT+CGDCONT?
+CGDCONT: 0,"","","",0,0
OK
mosh:~$ > at AT+COPS?
at AT+COPS?H+COPS: 0
OK
mosh:~$ > at AT%XMONITOR
at AT%XMONITOR
%XMONITOR: 2
OK
mosh:~$ > at AT+CPINR="SIM PIN"
at AT+CPINR="SIM PIN"
+CPINR: "SIM PIN",3
OK
mosh:~$ > at AT+CPINR="SIM PIN2"
at AT+CPINR="SIM PIN2"
+CPINR: "SIM PIN2",3
OK
mosh:~$ > at AT+CPINR="SIM PUK"
at AT+CPINR="SIM PUK"
+CPINR: "SIM PUK",10
OK
mosh:~$ > at AT+CPINR="SIM PUK2"
at AT+CPINR="SIM PUK2"
+CPINR: "SIM PUK2",10
OK
mosh:~$ > at AT%XSIM?
at AT%XSIM?H%XSIM: 1
OK
PDN event: PDP context 0 activated
PDN event: PDP context 0, PDN type IPv4 only allowed
Modem domain event: Search done
Network registration status: Connected - roaming
PSM parameter update: TAU: 3240, Active time: -1 seconds
Modem config for system mode: LTE-M - NB-IoT - GNSS
Modem config for LTE preference: LTE-M is preferred, but PLMN selection is more important
Currently active system mode: LTE-M
r׋e:       5046 mV
Modem temperature:     25 C
mosh:~$ Device ID:             nrf-359404230274905
Operator full name:   "Orange F"
Operator short name:  "Orange F"
Operator PLMN:        "20801"
Current cell id:       25533958 (0x01859E06)
Current phy cell id:   290
Current band:          20
Current TAC:           52644 (0xCDA4)
Current rsrp:          29: -112dBm
Current snr:           24: 0dB
Mobile network time and date: 25/08/06,14:34:44+08
PDP context info 1:
CID:                0
PDN ID:             0
PDP context active: yes
PDP type:           IP
APN:                m2m.tele2.com
IPv4 MTU:           1280
IPv4 address:       10.165.181.55
IPv6 address:       ::
IPv4 DNS address:   130.244.127.161, 130.244.127.169
IPv6 DNS address:   2a00:800:1000:3::1, 2a00:800:1000:4::1
RRC mode: Idle
RRC mode: Connected
Network registration status: not registered
PDN event: PDP context 0 network detach
RRC mode: Idle
[00:04:44.344,329] <wrn> lte_lc: Registration rejected, EMM cause: 7, Cell ID: 25533958, Tracking area: 52644, LTE mode: 7
mosh:~$ > at at+cfun=4
at at+cfun=4
Currently active system mode: None
OK
LTE cell changed: ID: -1, Tracking area: -1
mosh:~$ > at at+cfun=0
at at+cfun=0
OK
mosh:~$ > at at+cfun=1
at at+cfun=1
OK
PDN event: PDP context 0 activated
PDN event: PDP context 0, PDN type IPv4 only allowed
mosh:~$ > at AT%XSIM?
at AT%XSIM?H%XSIM: 1
OK
mosh:~$ > at AT%XSIM?H%XSIM: 1
at AT%XSIM?H%XSIM: 1
%XSIM: 1
OK
mosh:~$ >
mosh:~$ >
mosh:~$ > at AT%XMONITOR
at AT%XMONITOR
%XMONITOR: 5,"Orange F","Orange F","20801","CDA4",7,20,"01859E06",290,6400,31,28,"","11100000","11100000","01001001"
OK
mosh:~$ > at AT%XSIM=0
at AT%XSIM=0
ERROR
mosh:~$ > at AT%XSIM
at AT%XSIM
ERROR
mosh:~$ > at AT%XSIM=1
at AT%XSIM=1
OK
mosh:~$ > at AT+CFUN=1
at AT+CFUN=1
OK
mosh:~$ > at AT%XCONNSTAT=1
at AT%XCONNSTAT=1
OK
mosh:~$ > at AT%XCONNSTAT?
at AT%XCONNSTAT?
%XCONNSTAT: 0,0,0,0,0,0
OK
mosh:~$ > at AT+CMEE=1
at AT+CMEE=1
OK
mosh:~$ > at AT%XSIM=1
at AT%XSIM=1
OK
mosh:~$ > at AT+CEREG=5
at AT+CEREG=5
OK
mosh:~$ > at AT%MDMEV=1
at AT%MDMEV=1
OK
mosh:~$ > at AT%CESQ=1
at AT%CESQ=1
OK
mosh:~$ > at AT+CGSN=1
at AT+CGSN=1
+CGSN: "359404230274905"
OK
mosh:~$ > at AT+CGMM
at AT+CGMM
nRF9151-LACA
OK
mosh:~$ > at AT+CEMODE?
at AT+CEMODE?
+CEMODE: 2
OK
mosh:~$ > at AT+CMEE?
at AT+CMEE?
+CMEE: 1
OK
mosh:~$ > at AT+CNEC?
at AT+CNEC?H+CNEC: 16
OK
mosh:~$ > at AT+CGEREP?
at AT+CGEREP?
+CGEREP: 1,0
OK
mosh:~$ > at AT+CIND=1,1,1
at AT+CIND=1,1,1
OK
mosh:~$ > at AT+COPS=3,2
at AT+COPS=3,2
OK
mosh:~$ > at AT+CGDCONT?
at AT+CGDCONT?
+CGDCONT: 0,"IP","m2m.tele2.com","10.161.250.43",0,0
OK
mosh:~$ > at AT+CGACT?
at AT+CGACT?
+CGACT: 0,1
OK
mosh:~$ > at AT+CESQ
at AT+CESQ
+CESQ: 99,99,255,255,17,32
OK
mosh:~$ > at AT%XSIM?
at AT%XSIM?H%XSIM: 1
OK
mosh:~$ > at AT+CPIN?
at AT+CPIN?H+CPIN: READY
OK
mosh:~$ > at AT+CIMI
at AT+CIMI
240075823634698
OK
mosh:~$ > at AT+CNEC=24
at AT+CNEC=24
OK
mosh:~$ > at AT+CEER
at AT+CEER
+CEER: "ESM 50"
OK
mosh:~$ > at AT+CGEREP=1
at AT+CGEREP=1
OK
mosh:~$ > at AT%XPOFWARN=1,30
at AT%XPOFWARN=1,30
OK
mosh:~$ > at AT%XVBATLVL=1
at AT%XVBATLVL=1
OK
mosh:~$ > at AT+CGMI
at AT+CGMI
Nordic Semiconductor ASA
OK
mosh:~$ > at AT+CGMR
at AT+CGMR
mfw_nrf91x1_2.0.2
OK
mosh:~$ > at AT+CGSN
at AT+CGSN
359404230274905
OK
mosh:~$ > at AT%XMODEMUUID
at AT%XMODEMUUID
%XMODEMUUID: 320176d5-9f40-45fc-923b-2661ec18d547
OK
mosh:~$ > at AT%XDATAPRFL?
at AT%XDATAPRFL?
%XDATAPRFL: 2
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 5,5,"CDA4","01859E06",7,,,"11100000","11100000"
OK
mosh:~$ > at AT+CFUN?
at AT+CFUN?H+CFUN: 1
OK
mosh:~$ > at AT%CESQ=1
at AT%CESQ=1
OK
mosh:~$ > at AT+CSCON=1
at AT+CSCON=1
OK
mosh:~$ > at AT+CSCON?
at AT+CSCON?
+CSCON: 1,0
OK
mosh:~$ > at AT+CPAS
at AT+CPAS
+CPAS: 0
OK
mosh:~$ > at AT+CEDRXRDP
at AT+CEDRXRDP
+CEDRXRDP: 4,"","",""
OK
mosh:~$ > at AT%XTIME=1
at AT%XTIME=1
OK
mosh:~$ > at AT%CONEVAL
at AT%CONEVAL
%CONEVAL: 0,0,7,32,17,28,"01859E06","20801",290,6400,20,0,0,17,1,1,127
OK
mosh:~$ > at AT%XCBAND=?
at AT%XCBAND=?
%XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66,85)
OK
mosh:~$ at AT%XCBAND
> at AT%XCBAND
%XCBAND: 20
OK
mosh:~$ > at AT%HWVERSION
at AT%HWVERSION
%HWVERSION: nRF9151 LACA A0A
OK
mosh:~$ > at AT%XMODEMTRACE=1,2
at AT%XMODEMTRACE=1,2
OK
mosh:~$ > at AT%XSYSTEMMODE?
at AT%XSYSTEMMODE?%XSYSTEMMODE: 1,1,1,3
OK
mosh:~$ > at AT%XICCID
at AT%XICCID
%XICCID: 89462038075015721859
OK
mosh:~$ > at AT%XEMPR?
at AT%XEMPR?
%XEMPR:
OK
mosh:~$ > at AT+CGDCONT?
at AT+CGDCONT?
+CGDCONT: 0,"IP","m2m.tele2.com","10.161.250.43",0,0
OK
mosh:~$ > at AT+COPS?
at AT+COPS?+=AM2~",7
OK
mosh:~$ > at AT%XMONITOR
at AT%XMONITOR
%XMONITOR: 5,"Orange F","Orange F","20801","CDA4",7,20,"01859E06",290,6400,33,29,"","11100000","11100000","01001001"
OK
mosh:~$ > at AT+CPINR="SIM PIN"
at AT+CPINR="SIM PIN"
+CPINR: "SIM PIN",3
OK
mosh:~$ > at AT+CPINR="SIM PIN2"
at AT+CPINR="SIM PIN2"
+CPINR: "SIM PIN2",3
OK
mosh:~$ > at AT+CPINR="SIM PUK"
at AT+CPINR="SIM PUK"
+CPINR: "SIM PUK",10
OK
mosh:~$ > at AT+CPINR="SIM PUK2"
at AT+CPINR="SIM PUK2"
+CPINR: "SIM PUK2",10
OK
mosh:~$ > at AT%XSIM?
at AT%XSIM?H%XSIM: 1
OK
RRC mode: Connected
Currently active system mode: LTE-M
PDN event: PDP context 0 network detach
RRC mode: Idle
LTE cell changed: ID: 25533958, Tracking area: 52644
[00:08:51.386,901] <wrn> lte_lc: Registration rejected, EMM cause: 7, Cell ID: 25533958, Tracking area: 52644, LTE mode: 7
mosh:~$ > at+CFUN=0
at+CFUN=0
at+CFUN=0: command not found
mosh:~$ > at at+CFUN=0
at at+CFUN=0
Currently active system mode: None
OK
LTE cell changed: ID: -1, Tracking area: -1
mosh:~$ > at at+CFUN=1
at at+CFUN=1
OK
mosh:~$ > at at+reg?
at at+reg?
ERROR
mosh:~$ > at at+reg
at at+reg
ERROR
mosh:~$ > at at+creg?
at at+creg?ERROR
mosh:~$ > at at+creg
at at+creg
ERROR
mosh:~$ > at AT+CGDCONT?
at AT+CGDCONT?
+CGDCONT: 0,"","","",0,0
OK
mosh:~$ > at AT%XMONITOR
at AT%XMONITOR
%XMONITOR: 0
OK
mosh:~$ > at AT%XMONITOR
at AT%XMONITOR
%XMONITOR: 0
OK
mosh:~$ > at AT+CGDCONT?
at AT+CGDCONT?
+CGDCONT: 0,"","","",0,0
OK
mosh:~$ > at at+CFUN=0
at at+CFUN=0
OK
mosh:~$ > at at+CFUN=1
at at+CFUN=1
OK
mosh:~$ > at at+cfun=4
at at+cfun=4
OK
mosh:~$ > at at+cfun=0
at at+cfun=0
OK
mosh:~$ > at at+cfun=1
at at+cfun=1
OK
mosh:~$ > at at+cfun=4
at at+cfun=4
OK
mosh:~$ > at at+cfun=0
at at+cfun=0
OK
mosh:~$ > at at+cgatt=0
at at+cgatt=0
OK
mosh:~$ > at at+cfun=1
at at+cfun=1
OK
mosh:~$ > at at+creg=2
at at+creg=2
ERROR
mosh:~$ > at at+cereg=2
at at+cereg=2
OK
mosh:~$ > at at+csq
at at+csq
+CSQ: 99,99
OK
mosh:~$ > at at+csq
at at+csq
+CSQ: 99,99
OK
mosh:~$ > at at+csq
at at+csq
+CSQ: 99,99
OK
mosh:~$ > at at+cops
at at+cops
ERROR
mosh:~$ > at at+cops?
at at+cops?H+COPS: 0
OK
mosh:~$ > at at+cgdcont?
at at+cgdcont?
OK
mosh:~$ > at at+CFUN=0
at at+CFUN=0
OK
mosh:~$ > at at+CGATT=0
at at+CGATT=0
OK
mosh:~$ > at at+COPS=2
at at+COPS=2
ERROR
mosh:~$ > at at+CFUN=1
at at+CFUN=1
OK
mosh:~$ > at at+COPS=0
at at+COPS=0
OK
mosh:~$ > at AT+CGDCONT=1,\"IP",\"m2m.tele2.com\""
at AT+CGDCONT=1,\"IP",\"m2m.tele2.com\""
OK
mosh:~$ > at at+cereg=2
at at+cereg=2
OK
mosh:~$ > at+cereg?
at+cereg?
at+cereg?: command not found
mosh:~$ > at at+cereg?
at at+cereg?
+CEREG: 2,0
OK
mosh:~$ > at+cfun=0
at+cfun=0
at+cfun=0: command not found
mosh:~$ > at at+cfun=0
at at+cfun=0
OK
mosh:~$ > at at+cops=2
at at+cops=2
ERROR
mosh:~$ > at at+cgatt=0
at at+cgatt=0
OK
mosh:~$ > at AT+CGDCONT=1,"IP","m2m.tele2.com"
at AT+CGDCONT=1,"IP","m2m.tele2.com"
OK
mosh:~$ > at at+cfun=1
at at+cfun=1
OK
mosh:~$ > at at+cops=0
at at+cops=0
OK
mosh:~$ > at at+cereg=2
at at+cereg=2
OK
mosh:~$ > at at+cereg?
at at+cereg?
+CEREG: 2,0
OK
mosh:~$ > at AT%XSYSTEMMODE?
at AT%XSYSTEMMODE?
%XSYSTEMMODE: 1,1,1,3
OK
mosh:~$ > at AT%XSYSTEMMODE=1,0,0,0
at AT%XSYSTEMMODE=1,0,0,0
ERROR
mosh:~$ > at at+cfun=0
at at+cfun=0
OK
mosh:~$ > at AT%XSYSTEMMODE=1,0,0,0
at AT%XSYSTEMMODE=1,0,0,0
OK
mosh:~$ > at at+cfun=20
at at+cfun=20
OK
mosh:~$ > at AT%XSYSTEMMODE?
at AT%XSYSTEMMODE?
%XSYSTEMMODE: 1,0,0,0
OK
mosh:~$ > at at+cgatt=0
at at+cgatt=0
OK
mosh:~$ > at AT+CGDCONT=1,"IP","m2m.tele2.com"
at AT+CGDCONT=1,"IP","m2m.tele2.com"
OK
mosh:~$ > at AT+COPS=2
at AT+COPS=2
ERROR
mosh:~$ > at AT+CFUN=1
at AT+CFUN=1
OK
mosh:~$ > at AT+COPS=0
at AT+COPS=0
OK
mosh:~$ > at AT+CEREG=2
at AT+CEREG=2
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG=2,1
at AT+CEREG=2,1
OK
mosh:~$ > at AT+CEREG=2,2
at AT+CEREG=2,2
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT+CFUN=0
at AT+CFUN=0
OK
mosh:~$ > at AT+CGATT=0
at AT+CGATT=0
OK
mosh:~$ > at AT+CGDCONT=1,"IP","m2m.tele2.com"
at AT+CGDCONT=1,"IP","m2m.tele2.com"
OK
mosh:~$ > at AT%XSYSTEMMODE=1,0,0,0
at AT%XSYSTEMMODE=1,0,0,0
OK
mosh:~$ > at AT+CFUN=15
at AT+CFUN=15
ERROR
mosh:~$ > AT+CFUN=0
AT+CFUN=0
AT+CFUN=0: command not found
mosh:~$ > at AT+CFUN=4
at AT+CFUN=4
OK
mosh:~$ > at AT+CFUN=1
at AT+CFUN=1
OK
mosh:~$ > AT+COPS=0
AT+COPS=0
AT+COPS=0: command not found
mosh:~$ > at AT+COPS=0
at AT+COPS=0
OK
mosh:~$ > at AT+CEREG=2
at AT+CEREG=2
OK
mosh:~$ > at AT+CEREG?
at AT+CEREG?
+CEREG: 2,0
OK
mosh:~$ > at AT%XMONITOR
at AT%XMONITOR
%XMONITOR: 0
OK
mosh:~$ > at AT+COPS?
at AT+COPS?+COPS: 0
OK
mosh:~$ at AT+CGDCONT?
> at AT+CGDCONT?
+CGDCONT: 1,"IP","m2m.tele2.com","",0,0
OK
mosh:~$ > at AT+CPIN?
at AT+CPIN?+CPIN: READY
OK
mosh:~$ > at AT%SCANMODE=1
at AT%SCANMODE=1
ERROR
mosh:~$ > at AT%SCANCELL
at AT%SCANCELL
ERROR
mosh:~$

[Jon]

i forgot to add, we tried this with 3 different Thingy91x, and with 2 different operators (TELE2 and Onomondo). 
And of course, we have good network coverage in our office :)

Best

[Achim Kraus]

> EMM cause: 7

=> "EPS not allowed"

And that log is no modem trace ;-).

[Jon]

This happens when i deactivate the sim manually, So this one is okay and happens as expected ;) but the problem occurs after that

[Achim Kraus]

But you will still need to provide a modem trace for that case.

[dejans]

Hi Mathieu,

Here is a list of links from documentation to help you in capturing modem traces:
cellular monitor
capturing modem trace using cellular monitor
capturing modem trace
nrf91 snippets
%XMODEMTRACE set 
modem trace module

Best regards,
Dejan

[Jon]

So, I just couldn’t get modem traces working on the Thingy91X.
Every time I tried to use the required snippet, the build failed with:

undefined reference to `sys_clock_elapsed`

I didn’t want to sink more time into debugging this for now — all I was doing was building the at_client example with the snippet.

Instead, I reproduced the exact same issue on an nRF9151 DK, this time with traces available.

• Trace 1: before a power cycle

• Trace 2: after the power cycle

The test scenario is the same as before:

1. Using a Tele2 SIM card (unsteered, all operators available)

2. SIM is activated at the beginning

3. Then deactivated

4. Perform a few modem power off/on cycles

5. Reactivate the SIM after a while

That’s when the board fails to reattach — even after a full power cycle.

trace1.pcapngtrace2_posPowerCycle.pcapng

Best :)
Jon