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NRF9160DK PCA10090 0.8.5 - not able to connect to LTE tower at austria vienna

dear folks,

I bougth my dev kit last week from digikey. I tried the asset tacker demo out of the box without success. I tried nearly everything. Updated the modem to v1.0.0 recompiled the demo application flashed it but the kit will not connect to an lte tower. than I flashed the at_client and stepped through every single at command and figured out that the modem remains in lte network searching by +CEREG: 2,4,"FFFE","FFFFFFFF",7. This state will not change anymore. I tried A1 Sim card and the iBasis which both can connect to an LTE tower with an quectel modem but not with the nrf9160dk.

Are there any other suggestions I can try, or does anyone need more information to keep going?

best regards,

schnuckelg

  • Hi

    Can you try to open the log by pressing on the button?

    It appears that it is not possible to copy the output log from the "big black window".

    Can you paste the log from when the log file opens after you pressed on the button so that it is correctly formated?

    Best regards,

    Andreas

  • Dear Andreas!

    I modified my last post.

    Kind regards,

    schnuckelg

  • Hi.

    Can you update to the latest version of link monitor (v1.1.0) and send a screeenshot of the link monitor output?

    Like this:

    Best regards,

    Andreas

  • Hi.

    Can you try flashing this file:

    merged.hex

    Best regards,

    Andreas

  • Hi Andreas,

    this is the log with the link monitor v1.1.0

    2019-08-20T09:39:43.891Z INFO Application data folder: C:\Users\E5420\AppData\Roaming\nrfconnect\pc-nrfconnect-linkmonitor
    2019-08-20T09:39:44.123Z DEBUG App pc-nrfconnect-linkmonitor v1.1.0 official
    2019-08-20T09:39:44.123Z DEBUG App path: C:\Users\E5420\.nrfconnect-apps\node_modules\pc-nrfconnect-linkmonitor
    2019-08-20T09:39:44.123Z DEBUG nRFConnect 3.1.0 is supported by the app (^3.0.0)
    2019-08-20T09:39:44.123Z DEBUG nRFConnect path: C:\Users\E5420\AppData\Local\Programs\nrfconnect\resources\app.asar
    2019-08-20T09:39:44.124Z DEBUG HomeDir: C:\Users\E5420
    2019-08-20T09:39:44.124Z DEBUG TmpDir: C:\Users\E5420\AppData\Local\Temp
    2019-08-20T09:39:44.155Z VERBOSE Could not fetch serial number for serial port at COM1
    2019-08-20T09:39:49.033Z INFO Modem port is opened
    2019-08-20T09:39:49.083Z DEBUG modem >> AT+CFUN?\x0D\x0A
    2019-08-20T09:39:51.878Z DEBUG modem << ***** Booting Zephyr OS v1.14.99-ncs2 *****\x0D\x0A
    2019-08-20T09:39:51.887Z DEBUG modem << Flash region\x09\x09Domain\x09\x09Permissions\x0D\x0A
    2019-08-20T09:39:51.890Z DEBUG modem << 00 0x00000 0x08000 \x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.892Z DEBUG modem << 01 0x08000 0x10000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.897Z DEBUG modem << 02 0x10000 0x18000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.900Z DEBUG modem << 03 0x18000 0x20000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.902Z DEBUG modem << 04 0x20000 0x28000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.919Z DEBUG modem << 05 0x28000 0x30000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.931Z DEBUG modem << 06 0x30000 0x38000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.946Z DEBUG modem << 07 0x38000 0x40000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.948Z DEBUG modem << 08 0x40000 0x48000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.950Z DEBUG modem << 09 0x48000 0x50000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.951Z DEBUG modem << 10 0x50000 0x58000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.985Z DEBUG modem << 11 0x58000 0x60000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.987Z DEBUG modem << 12 0x60000 0x68000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.990Z DEBUG modem << 13 0x68000 0x70000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.990Z DEBUG modem << 14 0x70000 0x78000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.991Z DEBUG modem << 15 0x78000 0x80000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:51.998Z DEBUG modem << 16 0x80000 0x88000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.001Z DEBUG modem << 17 0x88000 0x90000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.003Z DEBUG modem << 18 0x90000 0x98000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.007Z DEBUG modem << 19 0x98000 0xa0000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.009Z DEBUG modem << 20 0xa0000 0xa8000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.011Z DEBUG modem << 21 0xa8000 0xb0000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.012Z DEBUG modem << 22 0xb0000 0xb8000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.013Z DEBUG modem << 23 0xb8000 0xc0000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.015Z DEBUG modem << 24 0xc0000 0xc8000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.016Z DEBUG modem << 25 0xc8000 0xd0000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.018Z DEBUG modem << 26 0xd0000 0xd8000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.024Z DEBUG modem << 27 0xd8000 0xe0000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.026Z DEBUG modem << 28 0xe0000 0xe8000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.027Z DEBUG modem << 29 0xe8000 0xf0000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.029Z DEBUG modem << 30 0xf0000 0xf8000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.030Z DEBUG modem << 31 0xf8000 0x100000 \x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.047Z DEBUG modem << Non-secure callable region 0 placed in flash region 0 with size 32.\x0D\x0A\x0D\x0A\x0D\x0A
    2019-08-20T09:39:52.049Z DEBUG modem << SRAM region\x09\x09Domain\x09\x09Permissions\x0D\x0A
    2019-08-20T09:39:52.051Z DEBUG modem << 00 0x00000 0x02000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.052Z DEBUG modem << 01 0x02000 0x04000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.055Z DEBUG modem << 02 0x04000 0x06000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.057Z DEBUG modem << 03 0x06000 0x08000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.059Z DEBUG modem << 04 0x08000 0x0a000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.060Z DEBUG modem << 05 0x0a000 0x0c000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.062Z DEBUG modem << 06 0x0c000 0x0e000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.062Z DEBUG modem << 07 0x0e000 0x10000\x09Secure\x09\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.063Z DEBUG modem << 08 0x10000 0x12000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.065Z DEBUG modem << 09 0x12000 0x14000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.068Z DEBUG modem << 10 0x14000 0x16000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.070Z DEBUG modem << 11 0x16000 0x18000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.080Z DEBUG modem << 12 0x18000 0x1a000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.081Z DEBUG modem << 13 0x1a000 0x1c000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.111Z DEBUG modem << 14 0x1c000 0x1e000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.116Z DEBUG modem << 15 0x1e000 0x20000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.117Z DEBUG modem << 16 0x20000 0x22000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.120Z DEBUG modem << 17 0x22000 0x24000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.121Z DEBUG modem << 18 0x24000 0x26000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.122Z DEBUG modem << 19 0x26000 0x28000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.123Z DEBUG modem << 20 0x28000 0x2a000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.125Z DEBUG modem << 21 0x2a000 0x2c000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.127Z DEBUG modem << 22 0x2c000 0x2e000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.156Z DEBUG modem << 23 0x2e000 0x30000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.157Z DEBUG modem << 24 0x30000 0x32000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.158Z DEBUG modem << 25 0x32000 0x34000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.159Z DEBUG modem << 26 0x34000 0x36000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.160Z DEBUG modem << 27 0x36000 0x38000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.161Z DEBUG modem << 28 0x38000 0x3a000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.164Z DEBUG modem << 29 0x3a000 0x3c000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.203Z DEBUG modem << 30 0x3c000 0x3e000\x09Non-Secure\x09rwxl\x0D\x0A
    2019-08-20T09:39:52.205Z DEBUG modem << 31 0x3e000 0x40000\x09Non-Secure\x09rwxl\x0D\x0A\x0D\x0A
    2019-08-20T09:39:52.206Z DEBUG modem << Peripheral\x09\x09Domain\x09\x09Status\x0D\x0A
    2019-08-20T09:39:52.209Z DEBUG modem << 00 NRF_P0\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.210Z DEBUG modem << 01 NRF_CLOCK\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.212Z DEBUG modem << 02 NRF_RTC1\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.213Z DEBUG modem << 03 NRF_NVMC\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.219Z DEBUG modem << 04 NRF_UARTE1\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.220Z DEBUG modem << 05 NRF_UARTE2\x09\x09Secure\x09\x09SKIP\x0D\x0A
    2019-08-20T09:39:52.222Z DEBUG modem << 06 NRF_TWIM2\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.223Z DEBUG modem << 07 NRF_SPIM3\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.226Z DEBUG modem << 08 NRF_TIMER0\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.228Z DEBUG modem << 09 NRF_TIMER1\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.229Z DEBUG modem << 10 NRF_TIMER2\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.229Z DEBUG modem << 11 NRF_SAADC\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.230Z DEBUG modem << 12 NRF_PWM0\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.231Z DEBUG modem << 13 NRF_PWM1\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.232Z DEBUG modem << 14 NRF_PWM2\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.236Z DEBUG modem << 15 NRF_PWM3\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.236Z DEBUG modem << 16 NRF_IPC\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.237Z DEBUG modem << 17 NRF_VMC\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.238Z DEBUG modem << 18 NRF_FPU\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.239Z DEBUG modem << 19 NRF_EGU1\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.240Z DEBUG modem << 20 NRF_EGU2\x09\x09Non-Secure\x09OK\x0D\x0A
    2019-08-20T09:39:52.242Z DEBUG modem << 21 NRF_GPIOTE1\x09\x09Non-Secure\x09OK\x0D\x0A\x0D\x0A
    2019-08-20T09:39:52.244Z DEBUG modem << SPM: NS image at 0xc000\x0D\x0A
    2019-08-20T09:39:52.244Z DEBUG modem << SPM: NS MSP at 0x20023b68\x0D\x0A
    2019-08-20T09:39:52.244Z DEBUG modem << SPM: NS reset vector at 0xe325\x0D\x0A
    2019-08-20T09:39:52.244Z DEBUG modem << SPM: prepare to jump to Non-Secure image.\x0D\x0A
    2019-08-20T09:39:53.777Z DEBUG modem << ***** Booting Zephyr OS v1.14.99-ncs2 *****\x0D\x0A
    2019-08-20T09:39:53.788Z DEBUG modem << The AT host sample started\x0D\x0A
    2019-08-20T09:40:12.711Z DEBUG modem >> at%xsystemmode=0,1,0,0\x0D\x0A
    2019-08-20T09:40:12.728Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:22.766Z DEBUG modem >> AT%XEPCO=0\x0D\x0A
    2019-08-20T09:40:22.787Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:25.433Z DEBUG modem >> AT+CFUN?\x0D\x0A
    2019-08-20T09:40:25.448Z DEBUG modem << +CFUN: 4\x0D\x0A
    2019-08-20T09:40:25.516Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:25.520Z DEBUG modem >> AT+CFUN=1\x0D\x0A
    2019-08-20T09:40:25.579Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.599Z DEBUG modem >> AT+CFUN?\x0D\x0A
    2019-08-20T09:40:27.611Z DEBUG modem << +CFUN: 1\x0D\x0A
    2019-08-20T09:40:27.624Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.628Z DEBUG modem >> AT+CGSN=1\x0D\x0A
    2019-08-20T09:40:27.655Z DEBUG modem << +CGSN: "352656100218752"\x0D\x0A
    2019-08-20T09:40:27.657Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.669Z DEBUG modem >> AT+CGMI\x0D\x0A
    2019-08-20T09:40:27.716Z DEBUG modem << Nordic Semiconductor ASA\x0D\x0A
    2019-08-20T09:40:27.717Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.722Z DEBUG modem >> AT+CGMM\x0D\x0A
    2019-08-20T09:40:27.771Z DEBUG modem << nRF9160-SICA\x0D\x0A
    2019-08-20T09:40:27.773Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.777Z DEBUG modem >> AT+CGMR\x0D\x0A
    2019-08-20T09:40:27.823Z DEBUG modem << mfw_nrf9160_1.0.0\x0D\x0A
    2019-08-20T09:40:27.828Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.829Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.0.0] SerNr: 352656100218752
    2019-08-20T09:40:27.831Z DEBUG modem >> AT+CEMODE?\x0D\x0A
    2019-08-20T09:40:27.881Z DEBUG modem << +CEMODE: 0\x0D\x0A
    2019-08-20T09:40:27.885Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.909Z DEBUG modem >> AT%XCBAND=?\x0D\x0A
    2019-08-20T09:40:27.966Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)\x0D\x0A
    2019-08-20T09:40:27.969Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:27.986Z DEBUG modem >> AT+CMEE?\x0D\x0A
    2019-08-20T09:40:27.990Z DEBUG modem << +CMEE: 0\x0D\x0A
    2019-08-20T09:40:27.992Z DEBUG modem << OK\x0D
    2019-08-20T09:40:27.995Z DEBUG modem >> AT+CMEE=1\x0D\x0A
    2019-08-20T09:40:28.011Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.015Z DEBUG modem >> AT+CNEC?\x0D\x0A
    2019-08-20T09:40:28.043Z DEBUG modem << +CNEC: 0\x0D\x0A
    2019-08-20T09:40:28.046Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.057Z DEBUG modem >> AT+CNEC=24\x0D\x0A
    2019-08-20T09:40:28.090Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.094Z DEBUG modem >> AT+CGEREP?\x0D\x0A
    2019-08-20T09:40:28.122Z DEBUG modem << +CGEREP: 0,0\x0D\x0A
    2019-08-20T09:40:28.123Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.126Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
    2019-08-20T09:40:28.147Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.150Z DEBUG modem >> AT+CGACT?\x0D\x0A
    2019-08-20T09:40:28.176Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.179Z DEBUG modem >> AT+CGEREP=1\x0D\x0A
    2019-08-20T09:40:28.212Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.215Z DEBUG modem >> AT+CIND=1,1,1\x0D\x0A
    2019-08-20T09:40:28.250Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.255Z DEBUG modem >> AT+CEREG=2\x0D\x0A
    2019-08-20T09:40:28.282Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.299Z DEBUG modem >> AT+CEREG?\x0D\x0A
    2019-08-20T09:40:28.357Z DEBUG modem << +CEREG: 2,4,"FFFE","FFFFFFFF",9\x0D\x0A
    2019-08-20T09:40:28.359Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.367Z DEBUG modem >> AT%CESQ=1\x0D\x0A
    2019-08-20T09:40:28.396Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.430Z DEBUG modem >> AT+CESQ\x0D\x0A
    2019-08-20T09:40:28.455Z DEBUG modem << +CESQ: 99,99,255,255,255,255\x0D\x0A
    2019-08-20T09:40:28.458Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.490Z DEBUG modem >> AT%XSIM=1\x0D\x0A
    2019-08-20T09:40:28.513Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.516Z DEBUG modem >> AT%XSIM?\x0D\x0A
    2019-08-20T09:40:28.542Z DEBUG modem << %XSIM: 1\x0D\x0A
    2019-08-20T09:40:28.609Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.621Z DEBUG modem >> AT+CPIN?\x0D\x0A
    2019-08-20T09:40:28.642Z DEBUG modem << +CPIN: READY\x0D\x0A
    2019-08-20T09:40:28.644Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.664Z DEBUG modem >> AT+CPINR="SIM PIN"\x0D\x0A
    2019-08-20T09:40:28.735Z DEBUG modem << +CPINR: "SIM PIN",3\x0D\x0A
    2019-08-20T09:40:28.738Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.747Z DEBUG modem >> AT+CIMI\x0D\x0A
    2019-08-20T09:40:28.762Z DEBUG modem << 204080813519271\x0D\x0A
    2019-08-20T09:40:28.764Z DEBUG modem << OK\x0D\x0A\x00
    2019-08-20T09:40:28.766Z INFO IMSIdentity: 204080813519271
    2019-08-20T09:42:34.888Z DEBUG modem << %CESQ: 47,2\x0D\x0A\x00
    2019-08-20T09:42:34.899Z DEBUG modem << +CEREG: 2,"C372","000C7BD0",9\x0D\x0A\x00
    2019-08-20T09:42:36.289Z DEBUG modem << +CNEC_EMM: 15\x0D\x0A\x00
    2019-08-20T09:42:36.298Z DEBUG modem << +CEREG: 4,"C372","000C7BD0",9\x0D\x0A\x00
    2019-08-20T09:44:33.871Z DEBUG modem << %CESQ: 255,0\x0D\x0A\x00
    2019-08-20T09:44:33.878Z DEBUG modem << +CEREG: 4,"FFFE","FFFFFFFF",9\x0D\x0A\x00
    

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