nRF9160 modem stuck in searching

[miked531]

The modem on the nrf9160DK (modem fw v1.1.0) appears to get stuck in searching mode. It doesn't happen all the time, and I was able to create it with the following AT commands:

(I want to see registration status changes)
AT+CEREG=2
AT%XSYSTEMMODE=0,1,0,0
AT+CFUN=1
(after some time (minutes?) reports AT+CEREG: 2, ...)
(then I see no more +CEREG status reports and give up)
AT+CFUN=4
(wait a few seconds)
AT+CFUN? reports +CFUN: 4, so it seems to have taken the command
AT+CEREG? reports +CEREG: 0,2,"XXXX","XXXXXXXX",9

This all works just fine with %XSYSTEMMODE=1,0,0,0. After the AT+CFUN=4 completes it will report +CEREG: 0,0,...

I kind of expect the connect to work with either mode, as I have good reception from both AT&T and Verizon, but I'm more concerned that the modem appears to get in an *almost* unrecoverable state. Changing systemmode to 1,0,0,0 followed by AT+CFUN=1 returns to normal behavior.

If it helps in troubleshooting, the AT+CFUN=4 takes ~3 seconds in mode 1,0,0,0 and less than 1 sec in mode 0,1,0,0

This link describes a similar issue: https://devzone.nordicsemi.com/f/nordic-q-a/55154/lte-network-detected-but-never-connected

[Martin Lesund]

Hi Mike,
Which SIM card are you using when you try to connect to the NB-IoT network (xsystemmode=0,1,0,0) ?

AT&T and Verizon do not have NB-IoT support according to GSMA, which would explain why you do not get attached to the network.
Please notice the responses from the CEREG, there you can see what the status of the modem is.
e.g. 

<stat>
0 – Not registered. User Equipment (UE) is not currently searching for an operator to register to.
1 – Registered, home network.
2 – Not registered, but UE is currently trying to attach or searching an operator to register to.
3 – Registration denied.
4 – Unknown (e.g. out of E-UTRAN coverage).
5 – Registered, roaming.
8 – Attached for emergency bearer services only.
90 – Not registered due to Universal Integrated Circuit Card (UICC) failure.

[miked531]

I'm using a SIM from Deutche Telekom. It was just an assumption that I could connect to nb-iot. It's actually good that I cannot so I have a reasonable test case for when the device gets sent off to who-knows-where that doesn't support it. Included is the log from my application today, trying to connect to nb-iot.

From what I can tell:

1. from 00:29 to 01:05 it tries to register with a couple different towers and at 01:05 the network tells me essentially to "leave me alone" with the +CGEV: RESTR 2,2
2. an hour later, starting at 01:03:39 we repeat the process (the application tries to connect every 60 minutes)
3. after another hour, at 02:09:55 we repeat. this time, we don't get any RESTR or CEREG stat = 4 responses
4. finally, the last few lines I ran manually hours later. you can see +CFUN is 4 and CEREG status is 2

It is the last two things (no CEREG=4 in the 3rd cycle, and CEREG=2 when CFUN is 4) that I am concerned about.

[00:00:03.294,891] <inf> modem: send: AT%XSYSTEMMODE=0,1,0,0
[00:00:03.296,905] <inf> modem: got: OK
[00:00:03.296,936] <inf> modem: send: AT+CFUN=1
[00:00:03.297,149] <inf> modem: got: OK
[00:00:03.297,149] <inf> modem: send: AT%XSYSTEMMODE?
[00:00:03.327,636] <inf> modem: got: OK
[00:00:03.328,796] <inf> modem: got: %XSYSTEMMODE: 0,1,0,0
[00:00:03.328,857] <inf> modem: got: OK
[00:00:03.328,887] <inf> modem: send: AT+CGMI
[00:00:03.329,223] <inf> modem: got: Nordic Semiconductor ASA
[00:00:03.329,254] <inf> modem: got: OK
[00:00:03.329,254] <inf> modem: send: AT+CGMM
[00:00:03.329,589] <inf> modem: got: nRF9160-SICA
[00:00:03.329,620] <inf> modem: got: OK
[00:00:03.329,650] <inf> modem: send: AT+CGMR
[00:00:03.329,956] <inf> modem: got: mfw_nrf9160_1.1.0
[00:00:03.329,986] <inf> modem: got: OK
[00:00:03.330,017] <inf> modem: send: AT+CGSN
[00:00:03.330,352] <inf> modem: got: 352656100038754
[00:00:03.330,383] <inf> modem: got: OK
[00:00:03.330,383] <inf> modem: send: AT+CIMI
[00:00:03.330,688] <inf> modem: got: ERROR
[00:00:03.330,718] <inf> modem: send: AT+CEREG=2
[00:00:03.330,993] <inf> modem: got: OK
[00:00:03.331,024] <inf> modem: send: AT%CESQ=1
[00:00:03.331,329] <inf> modem: got: OK
[00:00:03.331,359] <inf> modem: send: AT+CGEREP=1
[00:00:03.331,665] <inf> modem: got: OK
[00:00:29.140,502] <inf> lte: got: %CESQ: 67,3,18,2
[00:00:29.140,655] <inf> lte: got: +CEREG: 2,"131B","0112393B",9
[00:00:29.737,548] <inf> lte: got: +CEREG: 4,"131B","0112393B",9
[00:00:29.992,370] <inf> lte: got: %CESQ: 255,0,255,0
[00:00:29.992,553] <inf> lte: got: +CEREG: 4,"FFFE","FFFFFFFF",9
[00:00:39.849,822] <inf> lte: got: %CESQ: 60,3,18,2
[00:00:39.849,975] <inf> lte: got: +CEREG: 2,"6A81","019E9B0A",9
[00:00:40.664,459] <inf> lte: got: %CESQ: 255,0,255,0
[00:00:40.664,642] <inf> lte: got: +CEREG: 2,"FFFE","FFFFFFFF",9
[00:01:05.449,768] <inf> lte: got: %CESQ: 59,2,16,2
[00:01:05.449,829] <inf> lte: got: +CGEV: RESTR 2,2
[00:01:05.449,951] <inf> lte: got: +CEREG: 2,"6D82","01AAD614",9
[00:02:05.610,351] <inf> lte: got: +CEREG: 2,"6A81","019E9B0A",9
[00:02:34.772,460] <inf> lte: got: %CESQ: 59,2,21,3
[00:03:39.850,769] <inf> modem: send: AT+CFUN=4
[00:03:39.881,988] <inf> lte: got: %CESQ: 255,0,255,0
[00:03:39.882,141] <inf> lte: got: +CEREG: 0,"6A81","019E9B0A",9
[00:03:39.929,107] <inf> modem: got: OK
[01:03:39.891,632] <inf> modem: send: AT%XSYSTEMMODE=0,1,0,0
[01:03:39.893,676] <inf> modem: got: OK
[01:03:39.893,707] <inf> modem: send: AT+CFUN=1
[01:03:39.923,645] <inf> modem: got: OK
[01:05:42.274,322] <inf> lte: got: %CESQ: 60,3,17,2
[01:05:42.274,475] <inf> lte: got: +CEREG: 2,"6D82","01AAD614",9
[01:05:43.480,133] <inf> lte: got: %CESQ: 255,0,255,0
[01:05:43.480,316] <inf> lte: got: +CEREG: 2,"FFFE","FFFFFFFF",9
[01:06:24.436,370] <inf> lte: got: %CESQ: 43,2,21,3
[01:06:24.436,492] <inf> lte: got: +CEREG: 2,"EE0B","00C526D3",9
[01:06:25.002,136] <inf> lte: got: %CESQ: 255,0,255,0
[01:06:25.002,319] <inf> lte: got: +CEREG: 2,"FFFE","FFFFFFFF",9
[01:06:26.994,781] <inf> lte: got: %CESQ: 67,3,21,3
[01:06:26.994,934] <inf> lte: got: +CEREG: 4,"131B","0112393B",9
[01:08:03.295,867] <inf> lte: got: %CESQ: 67,3,26,3
[01:08:08.118,988] <inf> lte: got: %CESQ: 62,3,21,3
[01:08:08.119,079] <inf> lte: got: +CGEV: RESTR 2,2
[01:08:08.119,171] <inf> lte: got: +CEREG: 2,"6D82","01AAD614",9
[01:08:11.957,427] <inf> lte: got: +CEREG: 4,"131B","0112393B",9
[01:08:28.896,484] <inf> lte: got: %CESQ: 67,3,21,3
[01:08:34.016,601] <inf> lte: got: %CESQ: 67,3,26,3
[01:09:55.720,245] <inf> lte: got: %CESQ: 61,3,20,2
[01:09:55.720,336] <inf> lte: got: +CGEV: RESTR 2,2
[01:09:55.720,428] <inf> lte: got: +CEREG: 2,"6D82","01AAD614",9
[01:10:21.711,975] <inf> lte: got: %CESQ: 61,3,15,2
[01:10:21.712,158] <inf> lte: got: +CEREG: 2,"6A81","019E9B0A",9
[01:10:21.712,219] <inf> lte: got: +CGEV: RESTR 2,2
[01:10:50.872,955] <inf> lte: got: %CESQ: 61,3,20,2
[01:12:55.727,416] <inf> modem: send: AT+CFUN=4
[01:12:55.746,429] <inf> lte: got: %CESQ: 255,0,255,0
[01:12:56.035,461] <inf> modem: got: OK
[02:09:55.727,539] <inf> modem: send: AT%XSYSTEMMODE=0,1,0,0
[02:09:55.729,583] <inf> modem: got: OK
[02:09:55.729,614] <inf> modem: send: AT+CFUN=1
[02:09:55.759,643] <inf> modem: got: OK
[02:09:55.759,643] <inf> lte: set modem mode OFFLINE -> NORMAL
[02:12:06.933,532] <inf> lte: got: %CESQ: 39,1,21,3
[02:12:06.933,685] <inf> lte: got: +CEREG: 2,"EE0B","00C526D3",9
[02:12:07.499,328] <inf> lte: got: %CESQ: 255,0,255,0
[02:12:07.499,511] <inf> lte: got: +CEREG: 2,"FFFE","FFFFFFFF",9
[02:12:08.683,776] <inf> lte: got: %CESQ: 58,2,16,2
[02:12:08.683,929] <inf> lte: got: +CEREG: 2,"6A81","019E9B0A",9
[02:12:09.498,413] <inf> lte: got: %CESQ: 255,0,255,0
[02:12:09.498,565] <inf> lte: got: +CEREG: 2,"FFFE","FFFFFFFF",9
[02:12:34.283,752] <inf> lte: got: %CESQ: 59,2,17,2
[02:12:34.283,843] <inf> lte: got: +CGEV: RESTR 2,2
[02:12:34.283,935] <inf> lte: got: +CEREG: 2,"6D82","01AAD614",9
[02:12:55.726,928] <inf> modem: send: AT+CFUN=4
[02:12:55.739,990] <inf> lte: got: %CESQ: 255,0,255,0
[02:12:56.028,503] <inf> modem: got: OK

hours later, and manually I get:

AT+CFUN?
+CFUN: 4
OK
AT+CEREG?
+CEREG: 0,2,"6D82","01AAD614",9
OK

[Martin Lesund]

Hi Mike,
There seems like there is an issue with your SIM card since AT+CIMI responds with ERROR.
Most likely it is not initialized correctly. This could happen if the SIM card requires a PIN code before starting the modem.

Please check this with the command AT+CPIN?, and set the PIN code before AT+CFUN=1.
I would recommend sending AT+CEREG=5 , AT%CESQ=1, before AT+CFUN=1 as well to get notifications when the modem turns ON.
After AT+CFUN=1 (turning ON the modem) you could enable "Automatic Requests" in the settings tab if you are using the LTE Link Monitor and send the AT command, AT+CFUN?
to run through the script that updates all the parameters shown in the right hand side tab. It is easier to see what is going on if you run this automatically since it provides alot mote information about the modem + network.

Best regards,

Martin L.

[miked531]

I programmed the at_client example and ran the LTE link monitor and here's the results...

The AT+CIMI command returns ERROR until I have turned the modem on for the first time with AT+CFUN=1. This happens with both the DT SIM and iBasis SIM I have. Neither SIM has a PIN code set (AT+CPIN? responds with READY). I can understand the error, but didn't expect it.

After a fresh reboot, the AT+CPIN? command times out at which time the LTE link monitor no longer processes any AT commands (they all report timed out, also). AT+CPIN? works only after AT+CFUN=1. This remains until I reset the device (nrf9160 DK).

I should also point out that everything works just fine with xsystemmode=1,0,0,0

[Martin Lesund]

Hi Mike,
Thanks for confirming that everything works fine on the LTE-M network.

The information from the SIM card cannot be extracted unless the modem has been turned ON, because the SIM card is initialized when the Modem turns ON.

From your log when testing Nb-IoT network using DT SIM:

+CGEV: RESTR 2,2

You get a response from the modem "Requested Procedure restricted" with the "Restriction cause" being "Throttling. Procedure restricted by 3GPP or operator-specific throttling" and the "Validity of the restriction" being "Temporary restriction. Enabling requires e.g. back-off timer expiry" according to the documentation.

I would recommend you to contact DT with regards to the specification of your SIM card, if it actually gives you access to their NB-IoT network or if it only supports the LTE-M access.

For us to dig deeper into my suspicion that this is an issue with the SIM card not giving access to the network you could do a modem trace that we could analyze.

Best regards,
Martin L.

[miked531]

I will get a modem trace and see what I can find about the SIM, but it may be a few days until I can get that done. Another point to consider is that the same behavior is observed with the iBasis SIM that comes with the DK.

I didn't realize turning on the modem also turned on the SIM, but that makes sense.

Mike

[Martin Lesund]

Hi Mike, 
It would make sense that the iBasis SIM card would have the same behavior if the DT network has not allowed roaming SIMs onto their NB-IoT network.
So I recommend that you get in contact with DT and get an update on which type of SIM card that would allow you on their NB-IoT network.

[miked531]

I am using the DT and iBasis SIMs on an AT&T network (and occaisionally Verizon, depending where I am [again, same beharior]), which we hare already established does not support NB-IoT. Does that change your thinking at all?

[Martin Lesund]

Please contact DT on how to get connected to their NB-IoT network, and if you have the correct DT SIM for that.
When using DT SIM on LTE-M network, do you then roam on the verizon/AT&T network?

[miked531]

Martin,

I feel like we are going down the wrong path by contacting the carrier. Going back to my original issue, I see that AT+CFUN=4 does not seem to completely turn off the modem as expected. AT+CEREG continues to report status 2 (searching for network) after +CFUN=4, and does not change. Additionally, the modem behaves differently after a failed attempt to connect to NB-IoT, where future Cat-M1 connects take 80 seconds vice 5 seconds if I didn't attempt NB-IoT.

I hope to get the modem trace for you by this weekend.

[Martin Lesund]

Hi Mike,
Please share the log from LTE link monitor when you are getting this CEREG response after AT+CFUN=4.

e.g. This is what happens on my side:

[miked531]

I can't seem to find a way to attach the logs, so here they are inline. One diff between what you are getting is that I never get connected in NB-IoT mode.

First log is a successful LTE-M connection:

2020-02-08T01:24:56.852Z INFO Application data folder: /home/michael/.config/nrfconnect/pc-nrfconnect-linkmonitor
2020-02-08T01:24:56.913Z DEBUG App pc-nrfconnect-linkmonitor v1.1.1 official
2020-02-08T01:24:56.913Z DEBUG App path: /home/michael/.nrfconnect-apps/node_modules/pc-nrfconnect-linkmonitor
2020-02-08T01:24:56.913Z DEBUG nRFConnect 3.3.0 is supported by the app (^3.2.0)
2020-02-08T01:24:56.913Z DEBUG nRFConnect path: /tmp/.mount_nrfconwP3uvx/resources/app.asar
2020-02-08T01:24:56.913Z DEBUG HomeDir: /home/michael
2020-02-08T01:24:56.913Z DEBUG TmpDir: /tmp
2020-02-08T01:24:57.155Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS0
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS1
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS10
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS11
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS12
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS13
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS14
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS15
2020-02-08T01:24:57.156Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS16
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS17
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS18
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS19
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS2
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS20
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS21
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS22
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS23
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS24
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS25
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS26
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS27
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS28
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS29
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS3
2020-02-08T01:24:57.157Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS30
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS31
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS4
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS5
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS6
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS7
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS8
2020-02-08T01:24:57.158Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS9
2020-02-08T01:25:03.721Z INFO Modem port is opened
2020-02-08T01:25:03.733Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:25:03.766Z DEBUG modem << +CFUN: 0\x0D\x0A
2020-02-08T01:25:03.768Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:18.365Z DEBUG modem >> AT%XSYSTEMMODE?\x0D\x0A
2020-02-08T01:25:18.387Z DEBUG modem << %XSYSTEMMODE: 1,0,0,0\x0D\x0A
2020-02-08T01:25:18.397Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:21.200Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:25:21.227Z DEBUG modem << +CFUN: 0\x0D\x0A
2020-02-08T01:25:21.281Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:22.888Z DEBUG modem >> AT+CFUN=1\x0D\x0A
2020-02-08T01:25:22.933Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.783Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:25:24.793Z DEBUG modem << +CFUN: 1\x0D\x0A
2020-02-08T01:25:24.820Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.833Z DEBUG modem >> AT+CGSN=1\x0D\x0A
2020-02-08T01:25:24.845Z DEBUG modem << +CGSN: "352656100038754"\x0D\x0A
2020-02-08T01:25:24.854Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.867Z DEBUG modem >> AT+CGMI\x0D\x0A
2020-02-08T01:25:24.874Z DEBUG modem << Nordic Semiconductor ASA\x0D
2020-02-08T01:25:24.877Z DEBUG modem << \x0A
2020-02-08T01:25:24.880Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.888Z DEBUG modem >> AT+CGMM\x0D\x0A
2020-02-08T01:25:24.892Z DEBUG modem << nRF9160-SICA\x0D
2020-02-08T01:25:24.894Z DEBUG modem << \x0A
2020-02-08T01:25:24.896Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.903Z DEBUG modem >> AT+CGMR\x0D\x0A
2020-02-08T01:25:24.908Z DEBUG modem << mfw_nrf9160_1.1.0\x0D\x0A
2020-02-08T01:25:24.910Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.913Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.1.0] SerNr: 352656100038754
2020-02-08T01:25:24.917Z DEBUG modem >> AT+CEMODE?\x0D\x0A
2020-02-08T01:25:24.924Z DEBUG modem << +CEMODE: 2\x0D\x0A
2020-02-08T01:25:24.925Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.937Z DEBUG modem >> AT%XCBAND=?\x0D\x0A
2020-02-08T01:25:24.948Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,14,17,18,19,20,25,26,28,66)\x0D\x0A
2020-02-08T01:25:24.950Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.959Z DEBUG modem >> AT+CMEE?\x0D\x0A
2020-02-08T01:25:24.969Z DEBUG modem << +CMEE: 0\x0D\x0A
2020-02-08T01:25:24.971Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.974Z DEBUG modem >> AT+CMEE=1\x0D\x0A
2020-02-08T01:25:24.978Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.985Z DEBUG modem >> AT+CNEC?\x0D\x0A
2020-02-08T01:25:24.989Z DEBUG modem << +CNEC: 0\x0D
2020-02-08T01:25:24.990Z DEBUG modem << \x0A
2020-02-08T01:25:24.991Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:24.994Z DEBUG modem >> AT+CNEC=24\x0D\x0A
2020-02-08T01:25:25.001Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.005Z DEBUG modem >> AT+CGEREP?\x0D\x0A
2020-02-08T01:25:25.009Z DEBUG modem << +CGEREP: 0,0\x0D
2020-02-08T01:25:25.015Z DEBUG modem << \x0A
2020-02-08T01:25:25.019Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.022Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-02-08T01:25:25.025Z DEBUG modem << OK\x0D
2020-02-08T01:25:25.032Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-02-08T01:25:25.037Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.039Z DEBUG modem >> AT+CGEREP=1\x0D\x0A
2020-02-08T01:25:25.042Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.048Z DEBUG modem >> AT+CIND=1,1,1\x0D\x0A
2020-02-08T01:25:25.053Z DEBUG modem << OK\x0D
2020-02-08T01:25:25.055Z DEBUG modem >> AT+CEREG=2\x0D\x0A
2020-02-08T01:25:25.058Z DEBUG modem << OK\x0D
2020-02-08T01:25:25.061Z DEBUG modem >> AT+CEREG?\x0D\x0A
2020-02-08T01:25:25.067Z DEBUG modem << +CEREG: 2,4,"FFFE","FFFFFFFF",7\x0D\x0A
2020-02-08T01:25:25.069Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.082Z DEBUG modem >> AT%CESQ=1\x0D\x0A
2020-02-08T01:25:25.086Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.089Z DEBUG modem >> AT+CESQ\x0D\x0A
2020-02-08T01:25:25.094Z DEBUG modem << +CESQ: 99,99,255,255,255,255\x0D
2020-02-08T01:25:25.101Z DEBUG modem << \x0A
2020-02-08T01:25:25.103Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.109Z DEBUG modem >> AT%XSIM=1\x0D\x0A
2020-02-08T01:25:25.115Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:25.119Z DEBUG modem >> AT%XSIM?\x0D\x0A
2020-02-08T01:25:25.123Z DEBUG modem << %XSIM: 0\x0D
2020-02-08T01:25:25.124Z DEBUG modem << \x0A
2020-02-08T01:25:25.126Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:26.785Z DEBUG modem << %XSIM: 1\x0D\x0A
2020-02-08T01:25:26.812Z DEBUG modem >> AT+CPIN?\x0D\x0A
2020-02-08T01:25:26.822Z DEBUG modem << +CPIN: READY\x0D\x0A
2020-02-08T01:25:26.829Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:26.846Z DEBUG modem >> AT+CPINR="SIM PIN"\x0D\x0A
2020-02-08T01:25:27.094Z DEBUG modem << +CPINR: "SIM PIN",3\x0D
2020-02-08T01:25:27.095Z DEBUG modem << \x0A
2020-02-08T01:25:27.096Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:27.105Z DEBUG modem >> AT+CIMI\x0D\x0A
2020-02-08T01:25:27.110Z DEBUG modem << 262017740075598\x0D
2020-02-08T01:25:27.111Z DEBUG modem << \x0A
2020-02-08T01:25:27.113Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:27.114Z INFO IMSIdentity: 262017740075598
2020-02-08T01:25:27.685Z DEBUG modem << %CESQ: 54,2,14,2\x0D\x0A
2020-02-08T01:25:27.706Z DEBUG modem << +CEREG: 2,"121F","01123911",7\x0D\x0A
2020-02-08T01:25:29.388Z DEBUG modem << +CGEV: ME PDN ACT 0,0\x0D\x0A
2020-02-08T01:25:29.422Z DEBUG modem << +CNEC_ESM: 50,0\x0D\x0A
2020-02-08T01:25:29.443Z DEBUG modem << +CEREG: 5,"121F","01123911",7\x0D\x0A
2020-02-08T01:25:29.460Z DEBUG modem << +CIND: "service",1\x0D\x0A
2020-02-08T01:25:29.468Z DEBUG modem << +CIND: "roam",1\x0D\x0A
2020-02-08T01:25:29.473Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-02-08T01:25:29.482Z DEBUG modem << +CGDCONT: 0,"IP","internet.m2mportal.de","10.129.140.125",0,0\x0D
2020-02-08T01:25:29.484Z DEBUG modem << \x0A
2020-02-08T01:25:29.485Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:29.493Z DEBUG modem >> AT+COPS=3,2\x0D\x0A
2020-02-08T01:25:29.496Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:29.504Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-02-08T01:25:29.509Z DEBUG modem << +CGACT: 0,1\x0D\x0A
2020-02-08T01:25:29.510Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:29.515Z DEBUG modem >> AT+COPS?\x0D\x0A
2020-02-08T01:25:29.520Z DEBUG modem << +COPS: 0,2,"310410",7\x0D\x0A
2020-02-08T01:25:29.523Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:29.529Z DEBUG modem >> AT%XCBAND\x0D\x0A
2020-02-08T01:25:29.537Z DEBUG modem << %XCBAND: 17\x0D\x0A
2020-02-08T01:25:29.539Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:29.545Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-02-08T01:25:29.554Z DEBUG modem << +CGDCONT: 0,"IP","internet.m2mportal.de","10.129.140.125",0,0\x0D\x0A
2020-02-08T01:25:29.555Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:29.562Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-02-08T01:25:29.570Z DEBUG modem << +CGACT: 0,1\x0D\x0A
2020-02-08T01:25:29.572Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:36.642Z DEBUG modem << %CESQ: 54,2,9,1\x0D\x0A
2020-02-08T01:25:41.629Z DEBUG modem << %CESQ: 54,2,14,2\x0D
2020-02-08T01:25:53.810Z DEBUG modem >> AT+CFUN=4\x0D\x0A
2020-02-08T01:25:54.041Z DEBUG modem << +CGEV: ME PDN DEACT 0\x0D\x0A
2020-02-08T01:25:54.072Z DEBUG modem << +CEREG: 0,"121F","01123911",7\x0D\x0A
2020-02-08T01:25:54.097Z DEBUG modem << +CIND: "service",0\x0D\x0A
2020-02-08T01:25:54.111Z DEBUG modem << +CIND: "roam",0\x0D\x0A
2020-02-08T01:25:54.130Z DEBUG modem << +CGEV: ME DETACH\x0D\x0A
2020-02-08T01:25:55.499Z DEBUG modem << %CESQ: 255,0,255,0\x0D\x0A
2020-02-08T01:25:56.564Z DEBUG modem << %XSIM: 0\x0D
2020-02-08T01:25:56.593Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:56.598Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-02-08T01:25:56.613Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:56.616Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-02-08T01:25:56.629Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:56.631Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-02-08T01:25:56.644Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:25:56.648Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-02-08T01:25:56.661Z DEBUG modem << OK\x0D\x0A

And this is the failed NB-IoT:

2020-02-08T01:27:01.247Z INFO Application data folder: /home/michael/.config/nrfconnect/pc-nrfconnect-linkmonitor
2020-02-08T01:27:01.334Z DEBUG App pc-nrfconnect-linkmonitor v1.1.1 official
2020-02-08T01:27:01.334Z DEBUG App path: /home/michael/.nrfconnect-apps/node_modules/pc-nrfconnect-linkmonitor
2020-02-08T01:27:01.334Z DEBUG nRFConnect 3.3.0 is supported by the app (^3.2.0)
2020-02-08T01:27:01.334Z DEBUG nRFConnect path: /tmp/.mount_nrfconwP3uvx/resources/app.asar
2020-02-08T01:27:01.335Z DEBUG HomeDir: /home/michael
2020-02-08T01:27:01.335Z DEBUG TmpDir: /tmp
2020-02-08T01:27:01.627Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS0
2020-02-08T01:27:01.627Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS1
2020-02-08T01:27:01.627Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS10
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS11
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS12
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS13
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS14
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS15
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS16
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS17
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS18
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS19
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS2
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS20
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS21
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS22
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS23
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS24
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS25
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS26
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS27
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS28
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS29
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS3
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS30
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS31
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS4
2020-02-08T01:27:01.628Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS5
2020-02-08T01:27:01.629Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS6
2020-02-08T01:27:01.629Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS7
2020-02-08T01:27:01.629Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS8
2020-02-08T01:27:01.629Z VERBOSE Could not fetch serial number for serial port at /dev/ttyS9
2020-02-08T01:27:03.168Z INFO Modem port is opened
2020-02-08T01:27:03.176Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:27:03.179Z DEBUG modem << **** Booting Zephyr OS build v2.0.99-ncs1 *****\x0D\x0A
2020-02-08T01:27:03.180Z DEBUG modem << Flash region\x09\x09Domain\x09\x09Permissions\x0D\x0A
2020-02-08T01:27:03.182Z DEBUG modem << 00 0x00000 0x08000 \x09Secure\x09\x09rwxl\x0D\x0A
2020-02-08T01:27:03.211Z DEBUG modem << 01 0x0800+CFUN: 0\x0D\x0A
2020-02-08T01:27:03.214Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:12.268Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:27:12.287Z DEBUG modem << +CFUN: 0\x0D\x0A
2020-02-08T01:27:12.332Z DEBUG modem << OK\x0D
2020-02-08T01:27:23.497Z DEBUG modem >> AT%XSYSTEMMODE=0,1,0,0\x0D\x0A
2020-02-08T01:27:23.515Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:29.667Z DEBUG modem >> AT%XSYSTEMMODE?\x0D\x0A
2020-02-08T01:27:29.699Z DEBUG modem << %XSYSTEMMODE: 0,1,0,0\x0D\x0A
2020-02-08T01:27:29.706Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:32.332Z DEBUG modem >> AT+CFUN=1\x0D\x0A
2020-02-08T01:27:32.379Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:33.851Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:27:33.871Z DEBUG modem << +CFUN: 1\x0D\x0A
2020-02-08T01:27:33.908Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:33.927Z DEBUG modem >> AT+CGSN=1\x0D\x0A
2020-02-08T01:27:33.939Z DEBUG modem << +CGSN: "352656100038754"\x0D
2020-02-08T01:27:33.953Z DEBUG modem << \x0A
2020-02-08T01:27:33.955Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:33.960Z DEBUG modem >> AT+CGMI\x0D\x0A
2020-02-08T01:27:33.969Z DEBUG modem << Nordic Semiconductor ASA\x0D\x0A
2020-02-08T01:27:33.972Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:33.976Z DEBUG modem >> AT+CGMM\x0D\x0A
2020-02-08T01:27:33.986Z DEBUG modem << nRF9160-SICA\x0D\x0A
2020-02-08T01:27:33.990Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:33.992Z DEBUG modem >> AT+CGMR\x0D\x0A
2020-02-08T01:27:34.000Z DEBUG modem << mfw_nrf9160_1.1.0\x0D\x0A
2020-02-08T01:27:34.003Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.005Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.1.0] SerNr: 352656100038754
2020-02-08T01:27:34.006Z DEBUG modem >> AT+CEMODE?\x0D\x0A
2020-02-08T01:27:34.015Z DEBUG modem << +CEMODE: 0\x0D\x0A
2020-02-08T01:27:34.018Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.025Z DEBUG modem >> AT%XCBAND=?\x0D\x0A
2020-02-08T01:27:34.033Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)\x0D
2020-02-08T01:27:34.036Z DEBUG modem << \x0A
2020-02-08T01:27:34.037Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.051Z DEBUG modem >> AT+CMEE?\x0D\x0A
2020-02-08T01:27:34.056Z DEBUG modem << +CMEE: 0\x0D
2020-02-08T01:27:34.058Z DEBUG modem << \x0A
2020-02-08T01:27:34.059Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.066Z DEBUG modem >> AT+CMEE=1\x0D\x0A
2020-02-08T01:27:34.071Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.074Z DEBUG modem >> AT+CNEC?\x0D\x0A
2020-02-08T01:27:34.083Z DEBUG modem << +CNEC: 0\x0D\x0A
2020-02-08T01:27:34.085Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.088Z DEBUG modem >> AT+CNEC=24\x0D\x0A
2020-02-08T01:27:34.091Z DEBUG modem << OK\x0D
2020-02-08T01:27:34.100Z DEBUG modem >> AT+CGEREP?\x0D\x0A
2020-02-08T01:27:34.109Z DEBUG modem << +CGEREP: 0,0\x0D\x0A
2020-02-08T01:27:34.110Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.120Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-02-08T01:27:34.124Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.127Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-02-08T01:27:34.134Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.137Z DEBUG modem >> AT+CGEREP=1\x0D\x0A
2020-02-08T01:27:34.142Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.149Z DEBUG modem >> AT+CIND=1,1,1\x0D\x0A
2020-02-08T01:27:34.154Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.156Z DEBUG modem >> AT+CEREG=2\x0D\x0A
2020-02-08T01:27:34.160Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.170Z DEBUG modem >> AT+CEREG?\x0D\x0A
2020-02-08T01:27:34.177Z DEBUG modem << +CEREG: 2,4,"FFFE","FFFFFFFF",9\x0D
2020-02-08T01:27:34.180Z DEBUG modem << \x0A
2020-02-08T01:27:34.183Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.210Z DEBUG modem >> AT%CESQ=1\x0D\x0A
2020-02-08T01:27:34.216Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.220Z DEBUG modem >> AT+CESQ\x0D\x0A
2020-02-08T01:27:34.227Z DEBUG modem << +CESQ: 99,99,255,255,255,255\x0D
2020-02-08T01:27:34.239Z DEBUG modem << \x0A
2020-02-08T01:27:34.241Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.258Z DEBUG modem >> AT%XSIM=1\x0D\x0A
2020-02-08T01:27:34.263Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:34.275Z DEBUG modem >> AT%XSIM?\x0D\x0A
2020-02-08T01:27:34.281Z DEBUG modem << %XSIM: 0\x0D\x0A
2020-02-08T01:27:34.292Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:36.332Z DEBUG modem << %XSIM: 1\x0D\x0A
2020-02-08T01:27:36.368Z DEBUG modem >> AT+CPIN?\x0D\x0A
2020-02-08T01:27:36.374Z DEBUG modem << +CPIN: READY\x0D
2020-02-08T01:27:36.377Z DEBUG modem << \x0A
2020-02-08T01:27:36.380Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:36.392Z DEBUG modem >> AT+CPINR="SIM PIN"\x0D\x0A
2020-02-08T01:27:36.642Z DEBUG modem << +CPINR: "SIM PIN",3\x0D\x0A
2020-02-08T01:27:36.661Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:36.696Z DEBUG modem >> AT+CIMI\x0D\x0A
2020-02-08T01:27:36.707Z DEBUG modem << 262017740075598\x0D\x0A
2020-02-08T01:27:36.711Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:27:36.720Z INFO IMSIdentity: 262017740075598
2020-02-08T01:27:58.583Z DEBUG modem << %CESQ: 62,3,22,3\x0D\x0A
2020-02-08T01:27:58.620Z DEBUG modem << +CEREG: 2,"131B","0112393B",9\x0D\x0A
2020-02-08T01:27:59.370Z DEBUG modem << +CNEC_EMM: 15\x0D\x0A
2020-02-08T01:27:59.395Z DEBUG modem << +CEREG: 4,"131B","0112393B",9\x0D\x0A
2020-02-08T01:27:59.762Z DEBUG modem << %CESQ: 255,0,255,0\x0D
2020-02-08T01:27:59.771Z DEBUG modem << +CEREG: 4,"FFFE","FFFFFFFF",9\x0D\x0A
2020-02-08T01:28:09.452Z DEBUG modem << %CESQ: 56,2,18,2\x0D\x0A
2020-02-08T01:28:09.481Z DEBUG modem << +CEREG: 2,"6D82","01AAD61E",9\x0D\x0A
2020-02-08T01:28:12.368Z DEBUG modem << +CNEC_ESM: 32,0\x0D\x0A
2020-02-08T01:28:12.389Z DEBUG modem << +CNEC_EMM: 19\x0D\x0A
2020-02-08T01:28:13.216Z DEBUG modem << %CESQ: 255,0,255,0\x0D
2020-02-08T01:28:13.241Z DEBUG modem << +CEREG: 2,"FFFE","FFFFFFFF",9\x0D\x0A
2020-02-08T01:28:38.262Z DEBUG modem << %CESQ: 58,2,18,2\x0D\x0A
2020-02-08T01:28:38.287Z DEBUG modem << +CEREG: 2,"6D82","01AAD61E",9\x0D\x0A
2020-02-08T01:29:43.746Z DEBUG modem << %CESQ: 53,2,18,2\x0D\x0A
2020-02-08T01:31:56.870Z DEBUG modem << %CESQ: 58,2,18,2\x0D\x0A
2020-02-08T01:32:22.286Z DEBUG modem << %CESQ: 49,2,18,2\x0D\x0A
2020-02-08T01:32:22.336Z DEBUG modem << %CESQ: 49,2,23,3\x0D\x0A
2020-02-08T01:32:22.358Z DEBUG modem << +CEREG: 2,"EE0B","00C526D4",9\x0D\x0A
2020-02-08T01:32:23.155Z DEBUG modem << +CNEC_EMM: 11\x0D\x0A
2020-02-08T01:32:23.207Z DEBUG modem << %CESQ: 255,0,255,0\x0D\x0A
2020-02-08T01:32:23.244Z DEBUG modem << +CEREG: 2,"FFFE","FFFFFFFF",9\x0D\x0A
2020-02-08T01:32:27.392Z DEBUG modem << %CESQ: 62,3,21,3\x0D\x0A
2020-02-08T01:32:27.420Z DEBUG modem << +CEREG: 4,"131B","0112393B",9\x0D\x0A
2020-02-08T01:32:34.091Z DEBUG modem << %CESQ: 62,3,26,3\x0D\x0A
2020-02-08T01:32:36.127Z DEBUG modem >> AT+CFUN=4\x0D\x0A
2020-02-08T01:32:36.151Z DEBUG modem << %CESQ: 255,0,255,0\x0D\x0A
2020-02-08T01:32:36.385Z DEBUG modem << %XSIM: 0\x0D\x0A
2020-02-08T01:32:36.415Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:32:52.223Z DEBUG modem >> AT+CEREG?\x0D\x0A
2020-02-08T01:32:52.247Z DEBUG modem << +CEREG: 2,4,"131B","0112393B",9\x0D\x0A
2020-02-08T01:32:52.271Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:32:57.996Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-02-08T01:32:58.021Z DEBUG modem << +CFUN: 4\x0D\x0A
2020-02-08T01:32:58.047Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:32:58.070Z DEBUG modem >> AT+CFUN=1\x0D\x0A
2020-02-08T01:32:58.114Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:33:01.967Z DEBUG modem << %XSIM: 1\x0D\x0A
2020-02-08T01:33:02.001Z DEBUG modem >> AT+CPIN?\x0D\x0A
2020-02-08T01:33:02.012Z DEBUG modem << +CPIN: READY\x0D\x0A
2020-02-08T01:33:02.015Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:33:02.059Z DEBUG modem >> AT+CPINR="SIM PIN"\x0D\x0A
2020-02-08T01:33:02.273Z DEBUG modem << +CPINR: "SIM PIN",3\x0D
2020-02-08T01:33:02.277Z DEBUG modem << \x0A
2020-02-08T01:33:02.280Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:33:02.316Z DEBUG modem >> AT+CIMI\x0D\x0A
2020-02-08T01:33:02.326Z DEBUG modem << 262017740075598\x0D
2020-02-08T01:33:02.333Z DEBUG modem << \x0A
2020-02-08T01:33:02.337Z DEBUG modem << OK\x0D\x0A
2020-02-08T01:33:02.340Z INFO IMSIdentity: 262017740075598