nrf9160 : NB-IoT not able to connect

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Wed, 28 Oct 2020 05:32:36 GMT

Okay

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Thu, 22 Oct 2020 08:49:00 GMT

Hello Aswin,

Can you please open a new ticket for this issue, as it is out of scope?

Thank you!

Kind regards,
Øyvind

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Thu, 22 Oct 2020 04:55:40 GMT

We are getting another issue now. We are able to connect to Nb-IoT network Malaysia , but when tried HTTPs connect with our custom server ( ipv4 address ), the connect is getting failed.

The socket connect function ( connect() in socket.h ) is returning -1.

The wire shark logs are attached. Can you please help us in understanding this issue ?

Another observation is when server address is ipv6 , we are able to connect via HTTPS. Issue is seeing only with ipv4 address. However network have support for both ipv4 and ipv6.

Also we verified our custom server with ipv4 address independently using another LTE-M SIM. ( Tested the same application code with a different LTE-M network and SIM).

Below is the wire shark log collected when HTTPs connect is failing.

devzone.nordicsemi.com/.../20201021_2D00_NBIOT-_2D00_-CLoud.zip

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Tue, 20 Oct 2020 12:16:30 GMT

That is great news! Happy to help! :)

Kind regards,
Øyvind

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Tue, 20 Oct 2020 11:58:07 GMT

Yes! The carrier changed the parameter to the default as per spec and now able to connect to the NB-IoT network. Attaching the final log and trace for reference.

Thanks a lot for the support

devzone.nordicsemi.com/.../trace_5F00_working.zip

devzone.nordicsemi.com/.../4442.working-log.txt

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Tue, 20 Oct 2020 11:39:54 GMT

Is the issue fixed on your side?

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Mon, 19 Oct 2020 12:30:29 GMT

Thank you!

Is it possible to have some fix/workaround from carrier/network alone? If so what?

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Mon, 19 Oct 2020 12:27:41 GMT

You're welcome! As far as I understand, this is a little of both, as there will be a fix from our side as well.

-Øyvind

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Mon, 19 Oct 2020 11:00:15 GMT

Thanks a lot for the explanation! We will let the operator know about this.

Just to get a more clarity on this , the issue is in network operator or nordic or both ?

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Mon, 19 Oct 2020 10:48:51 GMT

Hello,

The network is not working according to specifications as it sends information element (APN aggregate maximum bit rate IE) that contains reserved values. With the fix coming later, the whole IE will be ignored as specified by 3GPP. In other words, currently there should be no UEs behaving according to the values given by network, because the IE should be ignored. The operator should be interested in hearing this.

A fix will be released, however, no timeline is given.

Kind regards,
Øyvind

RE: nrf9160 : NB-IoT not able to connect

SilasV — Fri, 16 Oct 2020 18:45:35 GMT

It seems you don't get good signal, you can try to run the AT commands manually. After putting the nRF to full function (i.e. after sending this command AT+CFUN=1 ) send this command -> AT+CESQ if you get the below response, that shows there is no signal

+CESQ: 99,99,255,255,255,255

wait for sometime and send the same command until you see response something like below:

+CESQ: 99,99,255,255,31,60 (last two numbers show signal strengths rsrq and rsrp - mapped to numbers from dB

if you still don't get after repeated tries, then you should relocate to different spot and try

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Fri, 16 Oct 2020 11:35:23 GMT

Thanks for the reply. We checked with CID as 0. But still issue is there.

Please see the attached logs and traces.

We also tried with the latest modem FW version 1.2.1 ( Earlier was checking with 1.2.0), but still issue is there.

Also attaching the pcap log file captured by n/w team and their observations.

devzone.nordicsemi.com/.../log2_5F00_trace.zip devzone.nordicsemi.com/.../log1_5F00_trace.zip devzone.nordicsemi.com/.../log1_5F00_mfw_5F00_1_5F00_2_5F00_0.txt devzone.nordicsemi.com/.../log2_5F00_mfw_5F00_1_5F00_2_5F00_1.txt

devzone.nordicsemi.com/.../nw_5F00_team_5F00_observations.zip

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Thu, 15 Oct 2020 13:27:11 GMT

I have not been able to forward your modem trace yet. Just to clarify some details first.

Can you please try to issue the command:
+CGDCONT: 0,"IP","yesiot","",0,0

In your previous attempts, you are using CID 1, but CID 0 is returning empty:

2020-10-13T10:21:46.588Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:21:46.600Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:21:46.605Z DEBUG modem << OK

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Thu, 15 Oct 2020 05:56:59 GMT

Below is the log with AT+CGDCONT command corrected .

2020-10-13T10:18:02.429Z DEBUG modem >> AT+CGDCONT=1,"IP","yesiot"
2020-10-13T10:18:02.470Z DEBUG modem << OK
2020-10-13T10:18:06.228Z DEBUG modem >> AT+CFUN?
2020-10-13T10:18:06.252Z DEBUG modem << +CFUN: 0
2020-10-13T10:18:06.263Z DEBUG modem << OK
2020-10-13T10:18:24.946Z DEBUG modem >> AT%XSYSTEMMODE=0,1,1,0
2020-10-13T10:18:25.015Z DEBUG modem << OK
2020-10-13T10:18:29.392Z DEBUG modem >> AT+CFUN=1
2020-10-13T10:18:29.481Z DEBUG modem << OK
2020-10-13T10:18:30.577Z DEBUG modem >> AT+CFUN?
2020-10-13T10:18:30.598Z DEBUG modem << +CFUN: 1
2020-10-13T10:18:30.608Z DEBUG modem << OK
2020-10-13T10:18:30.611Z DEBUG modem >> AT+CGSN=1
2020-10-13T10:18:30.640Z DEBUG modem << +CGSN: "352656100367617"
2020-10-13T10:18:30.648Z DEBUG modem << OK
2020-10-13T10:18:30.675Z DEBUG modem >> AT+CGMI
2020-10-13T10:18:30.719Z DEBUG modem << Nordic Semiconductor ASA
2020-10-13T10:18:30.721Z DEBUG modem << OK
2020-10-13T10:18:30.748Z DEBUG modem >> AT+CGMM
2020-10-13T10:18:30.783Z DEBUG modem << nRF9160-SICA
2020-10-13T10:18:30.785Z DEBUG modem << OK
2020-10-13T10:18:30.789Z DEBUG modem >> AT+CGMR
2020-10-13T10:18:30.825Z DEBUG modem << mfw_nrf9160_1.2.0
2020-10-13T10:18:30.827Z DEBUG modem << OK
2020-10-13T10:18:30.832Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.2.0] SerNr: 352656100367617
2020-10-13T10:18:30.865Z DEBUG modem >> AT+CEMODE?
2020-10-13T10:18:30.889Z DEBUG modem << +CEMODE: 0
2020-10-13T10:18:30.892Z DEBUG modem << OK
2020-10-13T10:18:30.936Z DEBUG modem >> AT%XCBAND=?
2020-10-13T10:18:30.967Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)
2020-10-13T10:18:30.969Z DEBUG modem << OK
2020-10-13T10:18:31.005Z DEBUG modem >> AT+CMEE?
2020-10-13T10:18:31.040Z DEBUG modem << +CMEE: 0
2020-10-13T10:18:31.065Z DEBUG modem <<
2020-10-13T10:18:31.068Z DEBUG modem << OK
2020-10-13T10:18:31.087Z DEBUG modem >> AT+CMEE=1
2020-10-13T10:18:31.135Z DEBUG modem << OK
2020-10-13T10:18:31.140Z DEBUG modem >> AT+CNEC?
2020-10-13T10:18:31.160Z DEBUG modem << +CNEC: 0
2020-10-13T10:18:31.165Z DEBUG modem << OK
2020-10-13T10:18:31.192Z DEBUG modem >> AT+CNEC=24
2020-10-13T10:18:31.226Z DEBUG modem << OK
2020-10-13T10:18:31.231Z DEBUG modem >> AT+CGEREP?
2020-10-13T10:18:31.238Z DEBUG modem << +CGEREP: 0,0
2020-10-13T10:18:31.240Z DEBUG modem << OK
2020-10-13T10:18:31.263Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:18:31.285Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:18:31.287Z DEBUG modem << OK
2020-10-13T10:18:31.331Z DEBUG modem >> AT+CGACT?
2020-10-13T10:18:31.354Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:18:31.358Z DEBUG modem <<
2020-10-13T10:18:31.361Z DEBUG modem << OK
2020-10-13T10:18:31.402Z DEBUG modem >> AT+CGEREP=1
2020-10-13T10:18:31.434Z DEBUG modem << OK
2020-10-13T10:18:31.438Z DEBUG modem >> AT+CIND=1,1,1
2020-10-13T10:18:31.475Z DEBUG modem << OK
2020-10-13T10:18:31.479Z DEBUG modem >> AT+CEREG=2
2020-10-13T10:18:31.525Z DEBUG modem << OK
2020-10-13T10:18:31.549Z DEBUG modem >> AT+CEREG?
2020-10-13T10:18:31.587Z DEBUG modem << +CEREG: 2,4,"FFFE","FFFFFFFF",9
2020-10-13T10:18:31.589Z DEBUG modem << OK
2020-10-13T10:18:31.630Z DEBUG modem >> AT%CESQ=1
2020-10-13T10:18:31.658Z DEBUG modem << OK
2020-10-13T10:18:31.665Z DEBUG modem >> AT+CESQ
2020-10-13T10:18:31.703Z DEBUG modem << +CESQ: 99,99,255,255,255,255
2020-10-13T10:18:31.708Z DEBUG modem << OK
2020-10-13T10:18:31.744Z DEBUG modem >> AT%XSIM=1
2020-10-13T10:18:31.773Z DEBUG modem << OK
2020-10-13T10:18:31.799Z DEBUG modem >> AT%XSIM?
2020-10-13T10:18:31.832Z DEBUG modem << %XSIM: 0
2020-10-13T10:18:31.861Z DEBUG modem << OK
2020-10-13T10:18:33.515Z DEBUG modem << %XSIM: 1
2020-10-13T10:18:33.577Z DEBUG modem >> AT+CPIN?
2020-10-13T10:18:33.630Z DEBUG modem << +CPIN: READY
2020-10-13T10:18:33.634Z DEBUG modem << OK
2020-10-13T10:18:33.663Z DEBUG modem >> AT+CPINR="SIM PIN"
2020-10-13T10:18:33.684Z DEBUG modem << +CPINR: "SIM PIN",3
2020-10-13T10:18:33.689Z DEBUG modem << OK
2020-10-13T10:18:33.774Z DEBUG modem >> AT+CIMI
2020-10-13T10:18:33.847Z DEBUG modem << 502151044530005
2020-10-13T10:18:33.851Z DEBUG modem << OK
2020-10-13T10:18:33.855Z INFO IMSIdentity: 502151044530005
2020-10-13T10:19:20.879Z DEBUG modem << %CESQ: 86,4,28,4
2020-10-13T10:19:20.952Z DEBUG modem << +CEREG: 2,"0888","0003EA0B",9
2020-10-13T10:19:22.825Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:19:22.894Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:19:22.906Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:19:22.913Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:19:22.917Z DEBUG modem << OK
2020-10-13T10:19:22.995Z DEBUG modem >> AT+CGACT?
2020-10-13T10:19:23.005Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:19:23.009Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:19:23.013Z DEBUG modem << OK
2020-10-13T10:19:34.803Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:19:34.826Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:19:34.833Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:19:34.836Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:19:34.840Z DEBUG modem << OK
2020-10-13T10:19:34.869Z DEBUG modem >> AT+CGACT?
2020-10-13T10:19:34.876Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:19:34.879Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:19:34.881Z DEBUG modem << OK
2020-10-13T10:19:46.892Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:19:46.958Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:19:46.970Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:19:46.976Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:19:46.980Z DEBUG modem << OK
2020-10-13T10:19:47.055Z DEBUG modem >> AT+CGACT?
2020-10-13T10:19:47.071Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:19:47.075Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:19:47.079Z DEBUG modem << OK
2020-10-13T10:19:58.980Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:19:59.052Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:19:59.064Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:19:59.071Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:19:59.075Z DEBUG modem << OK
2020-10-13T10:19:59.147Z DEBUG modem >> AT+CGACT?
2020-10-13T10:19:59.159Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:19:59.165Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:19:59.168Z DEBUG modem << OK
2020-10-13T10:20:10.865Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:20:10.899Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:20:10.909Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:20:10.914Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:20:10.916Z DEBUG modem << OK
2020-10-13T10:20:10.957Z DEBUG modem >> AT+CGACT?
2020-10-13T10:20:10.967Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:20:10.971Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:20:10.974Z DEBUG modem << OK
2020-10-13T10:20:22.753Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:20:22.829Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:20:22.844Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:20:22.851Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:20:22.855Z DEBUG modem << OK
2020-10-13T10:20:22.944Z DEBUG modem >> AT+CGACT?
2020-10-13T10:20:22.958Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:20:22.962Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:20:23.026Z DEBUG modem << OK
2020-10-13T10:20:34.827Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:20:34.857Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:20:34.866Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:20:34.870Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:20:34.872Z DEBUG modem << OK
2020-10-13T10:20:34.907Z DEBUG modem >> AT+CGACT?
2020-10-13T10:20:34.915Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:20:34.919Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:20:34.921Z DEBUG modem << OK
2020-10-13T10:20:46.679Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:20:46.756Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:20:46.770Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:20:46.776Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:20:46.781Z DEBUG modem << OK
2020-10-13T10:20:46.867Z DEBUG modem >> AT+CGACT?
2020-10-13T10:20:46.876Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:20:46.880Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:20:46.883Z DEBUG modem << OK
2020-10-13T10:20:58.503Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:20:58.579Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:20:58.589Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:20:58.598Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:20:58.602Z DEBUG modem << OK
2020-10-13T10:20:58.683Z DEBUG modem >> AT+CGACT?
2020-10-13T10:20:58.696Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:20:58.702Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:20:58.706Z DEBUG modem << OK
2020-10-13T10:21:10.412Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:21:10.442Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:21:10.452Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:21:10.455Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:21:10.457Z DEBUG modem << OK
2020-10-13T10:21:10.500Z DEBUG modem >> AT+CGACT?
2020-10-13T10:21:10.508Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:21:10.512Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:21:10.515Z DEBUG modem << OK
2020-10-13T10:21:22.494Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:21:22.566Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:21:22.578Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:21:22.584Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:21:22.588Z DEBUG modem << OK
2020-10-13T10:21:22.667Z DEBUG modem >> AT+CGACT?
2020-10-13T10:21:22.679Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:21:22.683Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:21:22.687Z DEBUG modem << OK
2020-10-13T10:21:34.430Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:21:34.507Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:21:34.520Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:21:34.527Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:21:34.531Z DEBUG modem << OK
2020-10-13T10:21:34.624Z DEBUG modem >> AT+CGACT?
2020-10-13T10:21:34.636Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:21:34.639Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:21:34.644Z DEBUG modem << OK
2020-10-13T10:21:38.021Z DEBUG modem << %CESQ: 81,4,28,4
2020-10-13T10:21:46.497Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:21:46.576Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:21:46.588Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:21:46.600Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:21:46.605Z DEBUG modem << OK
2020-10-13T10:21:46.699Z DEBUG modem >> AT+CGACT?
2020-10-13T10:21:46.708Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:21:46.714Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:21:46.718Z DEBUG modem << OK
2020-10-13T10:21:58.358Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:21:58.443Z DEBUG modem >> AT+CGDCONT?
2020-10-13T10:21:58.457Z DEBUG modem << +CGDCONT: 0,"IP","","",0,0
2020-10-13T10:21:58.464Z DEBUG modem << +CGDCONT: 1,"IP","yesiot","",0,0
2020-10-13T10:21:58.468Z DEBUG modem << OK
2020-10-13T10:21:58.565Z DEBUG modem >> AT+CGACT?
2020-10-13T10:21:58.575Z DEBUG modem << +CGACT: 0,0
2020-10-13T10:21:58.583Z DEBUG modem <<
2020-10-13T10:21:58.587Z DEBUG modem << +CGACT: 1,0
2020-10-13T10:21:58.592Z DEBUG modem << OK
2020-10-13T10:22:04.173Z DEBUG modem >> AT+COPS=?
2020-10-13T10:22:10.265Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:22:22.337Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:22:34.225Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:22:46.700Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:22:58.557Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:23:10.672Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:23:22.585Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:23:34.659Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:23:46.522Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:23:58.376Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:24:10.220Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:24:22.388Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:24:22.787Z DEBUG modem << %CESQ: 86,4,28,4
2020-10-13T10:24:34.262Z DEBUG modem << +CGEV: ME DETACH
2020-10-13T10:25:17.653Z DEBUG modem << %CESQ: 255,0,255,0
2020-10-13T10:25:17.659Z DEBUG modem << +CEREG: 2,"FFFE","FFFFFFFF",9
2020-10-13T10:28:16.547Z DEBUG modem << %CESQ: 85,4,24,3
2020-10-13T10:28:16.559Z DEBUG modem << +CEREG: 2,"0888","0003EA0B",9
2020-10-13T10:28:37.814Z DEBUG modem << %CESQ: 255,0,255,0
2020-10-13T10:28:37.824Z DEBUG modem << +CEREG: 2,"FFFE","FFFFFFFF",9
2020-10-13T10:29:44.919Z DEBUG modem << +CME ERROR: 0

RE: nrf9160 : NB-IoT not able to connect

Aswin P V — Wed, 14 Oct 2020 14:05:46 GMT

oh yes ... but i also tried with setting it properly. But I am getting the same results.

Any other issue in the log? Also can you advice how to troubleshoot this issue

We would like to know when "+CGEV: ME DETACH" happens and possible reasons

Thanks!

RE: nrf9160 : NB-IoT not able to connect

Øyvind — Wed, 14 Oct 2020 12:52:16 GMT

Hello Aswin,

From the log you have posted, is line number 7 from the bottom the only place where you added the APN? If so, you are missing a quotation mark:

[quote user=""]AT+CGDCONT=1,"IP",yesiot"[/quote]

It should be AT+CGDCONT=1,"IP","yesiot"

Kind regards,
Øyvind