nRF9160 LTE seems to connect then disconnects. LED3 on, LED4 off.

[Caycee]

After reprogramming with mfw_nrf9160_1.2.0 and nrf9160dk_asset_tracker_ltem_2020-04-29_bc7ade8b.hex

the nRF9160 fails to connect properly. LED3 blinks continually, LED4 never lights.

AT commands are accepted through LTE Link Monitor, but AT+CNUM creates a 'phone failure' error.

Zephyr continually reboots as shown in the included excerpt from the logfile. 

Log file shows 

Fullscreen debug.txt Download

2020-06-03T12:30:22.954Z INFO Application data folder: C:\Users\kcrippe\AppData\Roaming\nrfconnect\pc-nrfconnect-linkmonitor
2020-06-03T12:30:23.057Z DEBUG App pc-nrfconnect-linkmonitor v1.1.1 official
2020-06-03T12:30:23.058Z DEBUG App path: C:\Users\kcrippe\.nrfconnect-apps\node_modules\pc-nrfconnect-linkmonitor
2020-06-03T12:30:23.058Z DEBUG nRFConnect 3.3.3 is supported by the app (^3.2.0)
2020-06-03T12:30:23.058Z DEBUG nRFConnect path: C:\Users\kcrippe\AppData\Local\Programs\nrfconnect\resources\app.asar
2020-06-03T12:30:23.058Z DEBUG HomeDir: C:\Users\kcrippe
2020-06-03T12:30:23.058Z DEBUG TmpDir: C:\Users\kcrippe\AppData\Local\Temp
2020-06-03T12:30:23.064Z VERBOSE Could not fetch serial number for serial port at COM10
2020-06-03T12:30:23.064Z VERBOSE Could not fetch serial number for serial port at COM11
2020-06-03T12:30:24.959Z INFO Modem port is opened
2020-06-03T12:30:24.970Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-06-03T12:30:25.022Z DEBUG modem << UN: 1\x0D\x0A
2020-06-03T12:30:25.025Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:27.976Z DEBUG modem >> AT+CFUN?\x0D\x0A
2020-06-03T12:30:28.696Z DEBUG modem << +CFUN: 1\x0D\x0A
2020-06-03T12:30:28.736Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:28.744Z DEBUG modem >> AT+CGSN=1\x0D\x0A
2020-06-03T12:30:28.754Z DEBUG modem << +CGSN: "352656100031452"\x0D\x0A
2020-06-03T12:30:28.762Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:28.772Z DEBUG modem >> AT+CGMI\x0D\x0A
2020-06-03T12:30:28.781Z DEBUG modem << Nordic Semiconductor ASA\x0D\x0A
2020-06-03T12:30:28.785Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:28.797Z DEBUG modem >> AT+CGMM\x0D\x0A
2020-06-03T12:30:30.038Z DEBUG modem << nRF9160-SICA\x0D\x0A
2020-06-03T12:30:30.043Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.057Z DEBUG modem >> AT+CGMR\x0D\x0A
2020-06-03T12:30:30.068Z DEBUG modem << mfw_nrf9160_1.2.0\x0D\x0A
2020-06-03T12:30:30.075Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.081Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.2.0] SerNr: 352656100031452
2020-06-03T12:30:30.088Z DEBUG modem >> AT+CEMODE?\x0D\x0A
2020-06-03T12:30:30.101Z DEBUG modem << +CEMODE: 2\x0D\x0A
2020-06-03T12:30:30.111Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.137Z DEBUG modem >> AT%XCBAND=?\x0D\x0A
2020-06-03T12:30:30.149Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,17,18,19,20,25,26,28,66)\x0D\x0A
2020-06-03T12:30:30.152Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.170Z DEBUG modem >> AT+CMEE?\x0D\x0A
2020-06-03T12:30:30.177Z DEBUG modem << +CMEE: 0\x0D\x0A
2020-06-03T12:30:30.181Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.194Z DEBUG modem >> AT+CMEE=1\x0D\x0A
2020-06-03T12:30:30.205Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.214Z DEBUG modem >> AT+CNEC?\x0D\x0A
2020-06-03T12:30:30.222Z DEBUG modem << +CNEC: 0\x0D\x0A
2020-06-03T12:30:30.230Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.234Z DEBUG modem >> AT+CNEC=24\x0D\x0A
2020-06-03T12:30:30.247Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.252Z DEBUG modem >> AT+CGEREP?\x0D\x0A
2020-06-03T12:30:30.264Z DEBUG modem << +CGEREP: 0,0\x0D\x0A
2020-06-03T12:30:30.267Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.272Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-06-03T12:30:30.284Z DEBUG modem << +CGDCONT: 0,"IP","ibasis.iot","10.160.170.231",0,0\x0D\x0A
2020-06-03T12:30:30.289Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.307Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-06-03T12:30:30.318Z DEBUG modem << +CGACT: 0,1\x0D\x0A
2020-06-03T12:30:30.322Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.337Z DEBUG modem >> AT+CGEREP=1\x0D\x0A
2020-06-03T12:30:30.345Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.350Z DEBUG modem >> AT+CIND=1,1,1\x0D\x0A
2020-06-03T12:30:30.364Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.369Z DEBUG modem >> AT+CEREG=2\x0D\x0A
2020-06-03T12:30:30.385Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.402Z DEBUG modem >> AT+CEREG?\x0D\x0A
2020-06-03T12:30:30.415Z DEBUG modem << +CEREG: 2,5,"4905","011E7701",7\x0D\x0A
2020-06-03T12:30:30.420Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.443Z DEBUG modem >> AT+COPS=3,2\x0D\x0A
2020-06-03T12:30:30.454Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.463Z DEBUG modem >> AT+COPS?\x0D\x0A
2020-06-03T12:30:30.476Z DEBUG modem << +COPS: 0,2,"311480",7\x0D\x0A
2020-06-03T12:30:30.481Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.497Z DEBUG modem >> AT%XCBAND\x0D\x0A
2020-06-03T12:30:30.515Z DEBUG modem << %XCBAND: 13\x0D\x0A
2020-06-03T12:30:30.518Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.532Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-06-03T12:30:30.545Z DEBUG modem << +CGDCONT: 0,"IP","ibasis.iot","10.160.170.231",0,0\x0D\x0A
2020-06-03T12:30:30.548Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.563Z DEBUG modem >> AT+CGACT?\x0D\x0A
2020-06-03T12:30:30.578Z DEBUG modem << +CGACT: 0,1\x0D\x0A
2020-06-03T12:30:30.581Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.595Z DEBUG modem >> AT%CESQ=1\x0D\x0A
2020-06-03T12:30:30.601Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.611Z DEBUG modem >> AT+CESQ\x0D\x0A
2020-06-03T12:30:30.619Z DEBUG modem << +CESQ: 99,99,255,255,16,46\x0D\x0A
2020-06-03T12:30:30.628Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.643Z DEBUG modem >> AT%XSIM=1\x0D\x0A
2020-06-03T12:30:30.650Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.659Z DEBUG modem >> AT%XSIM?\x0D\x0A
2020-06-03T12:30:30.668Z DEBUG modem << %XSIM: 1\x0D\x0A
2020-06-03T12:30:30.673Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.689Z DEBUG modem >> AT+CPIN?\x0D\x0A
2020-06-03T12:30:30.708Z DEBUG modem << +CPIN: READY\x0D\x0A
2020-06-03T12:30:30.711Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.727Z DEBUG modem >> AT+CPINR="SIM PIN"\x0D\x0A
2020-06-03T12:30:30.743Z DEBUG modem << +CPINR: "SIM PIN",3\x0D\x0A
2020-06-03T12:30:30.745Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.761Z DEBUG modem >> AT+CIMI\x0D\x0A
2020-06-03T12:30:30.768Z DEBUG modem << 204080813514807\x0D
2020-06-03T12:30:30.772Z DEBUG modem << \x0A
2020-06-03T12:30:30.773Z DEBUG modem << OK\x0D\x0A
2020-06-03T12:30:30.775Z INFO IMSIdentity: 204080813514807
2020-06-03T12:30:30.884Z DEBUG modem << [00:00:14.559,478] \x1B[1;31m<err> asset_tracker: Socket error: POLLHUP\x1B[0m\x0D\x0A
2020-06-03T12:30:30.930Z DEBUG modem << [00:00:14.565,856] \x1B[1;31m<err> asset_tracker: Connection was closed by the cloud.\x1B[0m\x0D\x0A
2020-06-03T12:30:30.934Z DEBUG modem << [00:00:14.573,577] \x1B[1;31m<err> asset_tracker: LTE link disconnect\x1B[0m\x0D\x0A
2020-06-03T12:30:30.952Z DEBUG modem << +CGEV: ME PDN DEACT 0\x0D\x0A
2020-06-03T12:30:30.965Z DEBUG modem << +CEREG: 0,"4905","011E7701",7\x0D\x0A
2020-06-03T12:30:30.972Z DEBUG modem << +CIND: "service",0\x0D\x0A
2020-06-03T12:30:30.978Z DEBUG modem << +CIND: "roam",0\x0D\x0A
2020-06-03T12:30:30.982Z DEBUG modem << +CGEV: ME DETACH\x0D\x0A
2020-06-03T12:30:30.999Z DEBUG modem >> AT+CGDCONT?\x0D\x0A
2020-06-03T12:30:32.384Z DEBUG modem << %CESQ: 255,0,255,0\x0D\x0A
2020-06-03T12:30:32.405Z DEBUG modem << %XSIM: 0\x0D\x0A
2020-06-03T12:30:32.563Z DEBUG modem << [00:00:16.239,288] \x1B[1;31m<err> asset_tracker: Shutdown modem\x1B[0m\x0D\x0A
2020-06-03T12:30:32.582Z DEBUG modem << *** Booting Zephyr OS build v2.1.99-ncs1-1145-g13dc96f83bab  ***\x0D\x0A
2020-06-03T12:30:32.601Z DEBUG modem << [00:00:00.005,371] \x1B[0m<inf> mcuboot: Starting bootloader\x1B[0m\x0D\x0A
2020-06-03T12:30:32.616Z DEBUG modem << [00:00:00.011,596] \x1B[0m<inf> mcuboot: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3\x1B[0m\x0D\x0A
2020-06-03T12:30:32.619Z DEBUG modem << [00:00:00.021,484] \x1B[0m<inf> mcuboot: Boot source: none\x1B[0m\x0D\x0A
2020-06-03T12:30:32.633Z DEBUG modem << [00:00:00.026,855] \x1B[0m<inf> mcuboot: Swap type: none\x1B[0m\x0D\x0A
2020-06-03T12:30:32.937Z DEBUG modem << [00:00:00.353,088] \x1B[0m<inf> mcuboot: Bootloader chainload address offset: 0x10000\x1B[0m\x0D\x0A
2020-06-03T12:30:32.957Z DEBUG modem << [00:00:00.360,687] \x1B[0m<inf> mcuboot: Jumping to the first image slot\x1B[0m\x0D\x0A
2020-06-03T12:30:32.960Z DEBUG modem << *** Booting Zephyr OS build v2.1.99-ncs1-1145-g13dc96f83bab  ***\x0D\x0A
2020-06-03T12:30:32.963Z DEBUG modem << Flash regions\x09\x09Domain\x09\x09Permissions\x0D\x0A
2020-06-03T12:30:32.965Z DEBUG modem << 00 02 0x00000 0x18000 \x09Secure\x09\x09rwxl\x0D\x0A
2020-06-03T12:30:32.969Z DEBUG modem << 03 31 0x18000 0x100000 \x09Non-Secure\x09rwxl\x0D\x0A\x0D\x0A
2020-06-03T12:30:32.972Z DEBUG modem << Non-secure callable region 0 placed in flash region 2 with size 32.\x0D\x0A\x0D\x0A
2020-06-03T12:30:33.135Z DEBUG modem << SRAM region\x09\x09Domain\x09\x09Permissions\x0D\x0A
2020-06-03T12:30:33.153Z DEBUG modem << 00 07 0x00000 0x10000 \x09Secure\x09\x09rwxl\x0D\x0A
2020-06-03T12:30:33.173Z DEBUG modem << 08 31 0x10000 0x40000 \x09Non-Secure\x09rwxl\x0D\x0A\x0D\x0A
2020-06-03T12:30:33.175Z DEBUG modem << Peripheral\x09\x09Domain\x09\x09Status\x0D\x0A
2020-06-03T12:30:33.177Z DEBUG modem << 00 NRF_P0               Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.179Z DEBUG modem << 01 NRF_CLOCK            Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.181Z DEBUG modem << 02 NRF_RTC0             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.183Z DEBUG modem << 03 NRF_RTC1             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.186Z DEBUG modem << 04 NRF_NVMC             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.188Z DEBUG modem << 05 NRF_UARTE1           Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.189Z DEBUG modem << 06 NRF_UARTE2           Secure\x09\x09SKIP\x0D\x0A
2020-06-03T12:30:33.191Z DEBUG modem << 07 NRF_TWIM2            Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.192Z DEBUG modem << 08 NRF_SPIM3            Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.193Z DEBUG modem << 09 NRF_TIMER0           Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.194Z DEBUG modem << 10 NRF_TIMER1           Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.195Z DEBUG modem << 11 NRF_TIMER2           Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.211Z DEBUG modem << 12 NRF_SAADC            Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.213Z DEBUG modem << 13 NRF_PWM0             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.215Z DEBUG modem << 14 NRF_PWM1             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.217Z DEBUG modem << 15 NRF_PWM2             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.220Z DEBUG modem << 16 NRF_PWM3             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.222Z DEBUG modem << 17 NRF_WDT              Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.224Z DEBUG modem << 18 NRF_IPC              Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.225Z DEBUG modem << 19 NRF_VMC              Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.227Z DEBUG modem << 20 NRF_FPU              Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.229Z DEBUG modem << 21 NRF_EGU1             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.243Z DEBUG modem << 22 NRF_EGU2             Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.244Z DEBUG modem << 23 NRF_DPPIC            Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.246Z DEBUG modem << 24 NRF_GPIOTE1          Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:33.248Z DEBUG modem << 25 NRF_REGULATORS       Non-Secure\x09OK\x0D\x0A\x0D\x0A
2020-06-03T12:30:33.251Z DEBUG modem << SPM: NS image at 0x1c200\x0D\x0A
2020-06-03T12:30:33.253Z DEBUG modem << SPM: NS MSP at 0x2002f080\x0D\x0A
2020-06-03T12:30:33.255Z DEBUG modem << SPM: NS reset vector at 0x252f1\x0D\x0A
2020-06-03T12:30:33.257Z DEBUG modem << SPM: prepare to jump to Non-Secure image.\x0D\x0A
2020-06-03T12:30:33.437Z DEBUG modem << *** Booting Zephyr OS build v2.1.99-ncs1-1145-g13dc96f83bab  ***\x0D\x0A
2020-06-03T12:30:33.459Z DEBUG modem << [00:00:00.189,056] \x1B[0m<dbg> nrf9160_gps.setup: MAGPIO set: AT%XMAGPIO=1,0,0,1,1,1574,1577\x1B[0m\x0D\x0A
2020-06-03T12:30:33.462Z DEBUG modem << [00:00:00.197,814] \x1B[0m<dbg> nrf9160_gps.setup: COEX0 set: AT%XCOEX0=1,1,1570,1580\x1B[0m\x0D\x0A
2020-06-03T12:30:33.468Z DEBUG modem << [00:00:00.205,413] \x1B[0m<inf> asset_tracker: Asset tracker started\x1B[0m\x0D\x0A
2020-06-03T12:30:33.476Z DEBUG modem << [00:00:00.218,688] \x1B[0m<dbg> nrf_cloud_transport.nct_client_id_get: client_id = nrf-352656100031452\x1B[0m\x0D\x0A
2020-06-03T12:30:33.497Z DEBUG modem << [00:00:00.227,783] \x1B[0m<dbg> nrf_cloud_transport.nct_topics_populate: shadow_base_topic: $aws/things/nrf-352656100031452/shadow\x1B[0m\x0D\x0A
2020-06-03T12:30:33.507Z DEBUG modem << [00:00:00.239,318] \x1B[0m<dbg> nrf_cloud_transport.nct_topics_populate: accepted_topic: nrf-352656100031452/shadow/get/accepted\x1B[0m\x0D\x0A
2020-06-03T12:30:33.524Z DEBUG modem << [00:00:00.250,640] \x1B[0m<dbg> nrf_cloud_transport.nct_topics_populate: rejected_topic: $aws/things/nrf-352656100031452/shadow/get/rejected\x1B[0m\x0D\x0A
2020-06-03T12:30:33.539Z DEBUG modem << [00:00:00.263,031] \x1B[0m<dbg> nrf_cloud_transport.nct_topics_populate: update_delta_topic: $aws/things/nrf-352656100031452/shadow/update/delta\x1B[0m\x0D\x0A
2020-06-03T12:30:33.543Z DEBUG modem << [00:00:00.275,756] \x1B[0m<dbg> nrf_cloud_transport.nct_topics_populate: update_topic: $aws/things/nrf-352656100031452/shadow/update\x1B[0m\x0D\x0A
2020-06-03T12:30:33.546Z DEBUG modem << [00:00:00.287,445] \x1B[0m<dbg> nrf_cloud_transport.nct_topics_populate: shadow_get_topic: $aws/things/nrf-352656100031452/shadow/get\x1B[0m\x0D
2020-06-03T12:30:33.550Z DEBUG modem << \x0A
2020-06-03T12:30:33.565Z DEBUG modem << [00:00:00.299,468] \x1B[0m<inf> asset_tracker: Connecting to LTE network. \x1B[0m\x0D\x0A
2020-06-03T12:30:33.568Z DEBUG modem << [00:00:00.306,121] \x1B[0m<inf> asset_tracker: This may take several minutes.\x1B[0m\x0D\x0A
2020-06-03T12:30:33.578Z DEBUG modem << [00:00:00.320,983] \x1B[0m<dbg> lte_lc.w_lte_lc_connect: Network mode: AT%XSYSTEMMODE=1,0,1,0\x1B[0m\x0D\x0A
2020-06-03T12:30:38.297Z DEBUG modem << +CEREG: 2,"4905","011E7701",7,0,0,"11100000","11100000"\x0D\x0A
2020-06-03T12:30:38.322Z DEBUG modem << [00:00:05.048,614] \x1B[0m<dbg> lte_lc.parse_nw_reg_status: Network registration status: 2\x1B[0m\x0D\x0A
2020-06-03T12:30:41.676Z DEBUG modem << +CEREG: 5,"4905","011E7701",7,,,"11100000","11100000"\x0D
2020-06-03T12:30:41.696Z DEBUG modem << \x0A
2020-06-03T12:30:41.721Z DEBUG modem << [00:00:08.428,314] \x1B[0m<dbg> lte_lc.parse_nw_reg_status: Network registration status: 5\x1B[0m\x0D\x0A
2020-06-03T12:30:41.725Z DEBUG modem << [00:00:08.436,584] \x1B[0m<inf> asset_tracker: Connected to LTE network\x1B[0m\x0D\x0A
2020-06-03T12:30:41.901Z DEBUG modem << [00:00:08.645,507] \x1B[0m<dbg> nrf_cloud_transport.nct_connect: IPv4 Address 0x4e22ae36\x1B[0m\x0D\x0A
2020-06-03T12:30:41.916Z DEBUG modem << [00:00:08.653,442] \x1B[0m<dbg> nrf_cloud_transport.nct_mqtt_connect: mqtt_connect requesting persistent session\x1B[0m\x0D\x0A
2020-06-03T12:30:48.052Z DEBUG modem << [00:00:14.798,034] \x1B[1;31m<err> asset_tracker: Socket error: POLLHUP\x1B[0m\x0D
2020-06-03T12:30:48.080Z DEBUG modem << \x0A
2020-06-03T12:30:48.082Z DEBUG modem << [00:00:14.804,565] \x1B[1;31m<err> asset_tracker: Connection was closed by the cloud.\x1B[0m\x0D\x0A
2020-06-03T12:30:48.085Z DEBUG modem << [00:00:14.812,225] \x1B[1;31m<err> asset_tracker: LTE link disconnect\x1B[0m\x0D\x0A
2020-06-03T12:30:48.153Z DEBUG modem << +CEREG: 0,"4905","011E7701",7,0,0,"11100000","11100000"\x0D\x0A
2020-06-03T12:30:50.947Z DEBUG modem << [00:00:17.692,901] \x1B[1;31m<err> asset_tracker: Shutdown modem\x1B[0m\x0D\x0A
2020-06-03T12:30:50.976Z DEBUG modem << *** Booting Zephyr OS build v2.1.99-ncs1-1145-g13dc96f83bab  ***\x0D\x0A
2020-06-03T12:30:50.980Z DEBUG modem << [00:00:00.005,371] \x1B[0m<inf> mcuboot: Starting bootloader\x1B[0m\x0D\x0A
2020-06-03T12:30:50.985Z DEBUG modem << [00:00:00.011,596] \x1B[0m<inf> mcuboot: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3\x1B[0m\x0D\x0A
2020-06-03T12:30:51.003Z DEBUG modem << [00:00:00.021,484] \x1B[0m<inf> mcuboot: Boot source: none\x1B[0m\x0D\x0A
2020-06-03T12:30:51.008Z DEBUG modem << [00:00:00.026,855] \x1B[0m<inf> mcuboot: Swap type: none\x1B[0m\x0D\x0A
2020-06-03T12:30:51.321Z DEBUG modem << [00:00:00.353,027] \x1B[0m<inf> mcuboot: Bootloader chainload address offset: 0x10000\x1B[0m\x0D
2020-06-03T12:30:51.345Z DEBUG modem << \x0A
2020-06-03T12:30:51.350Z DEBUG modem << [00:00:00.360,626] \x1B[0m<inf> mcuboot: Jumping to the first image slot\x1B[0m\x0D\x0A
2020-06-03T12:30:51.352Z DEBUG modem << *** Booting Zephyr OS build v2.1.99-ncs1-1145-g13dc96f83bab  ***\x0D\x0A
2020-06-03T12:30:51.353Z DEBUG modem << Flash regions\x09\x09Domain\x09\x09Permissions\x0D\x0A
2020-06-03T12:30:51.355Z DEBUG modem << 00 02 0x00000 0x18000 \x09Secure\x09\x09rwxl\x0D\x0A
2020-06-03T12:30:51.357Z DEBUG modem << 03 31 0x18000 0x100000 \x09Non-Secure\x09rwxl\x0D\x0A\x0D\x0A
2020-06-03T12:30:51.358Z DEBUG modem << Non-secure callable region 0 placed in flash region 2 with size 32.\x0D\x0A\x0D\x0A
2020-06-03T12:30:51.519Z DEBUG modem << SRAM region\x09\x09Domain\x09\x09Permissions\x0D\x0A
2020-06-03T12:30:51.544Z DEBUG modem << 00 07 0x00000 0x10000 \x09Secure\x09\x09rwxl\x0D\x0A
2020-06-03T12:30:51.548Z DEBUG modem << 08 31 0x10000 0x40000 \x09Non-Secure\x09rwxl\x0D\x0A\x0D\x0A
2020-06-03T12:30:51.556Z DEBUG modem << Peripheral\x09\x09Domain\x09\x09Status\x0D\x0A
2020-06-03T12:30:51.559Z DEBUG modem << 00 NRF_P0               Non-Secure\x09OK\x0D\x0A
2020-06-03T12:30:51.560Z DEBUG modem << 01 NRF_CLOCK            Non-Secure\x09OK\x0D\x0A

[Øyvind]

Hello, 

Thanks for providing your log file. Good to see that both modem and application is up to date. The error that is causing this is due to:

asset_tracker: Socket error: POLLHUP

Did you power cycle the board after the update?

Also, have you updated your certificates on your board following this guide? It not, can you please try this as well. Note that it is important to carefully read the steps before starting. 

Let me know how that works for you. 

Kind regards,
Øyvind