nrf9160 reboots sporadically after some time.

Question

Hi,

I searched the forum and could not find a solution to my problem. So I decided to ask it here.

I am developing an application that sends some data to the cloud via MQTT. I receive the data and it works fine. However, after some time, the application restarts and I do not know why. This behaviour can be seen on the lines 86, 127and 163 in the LTE link monitor.

I thought it has some thing to do with deep sleep and tried to prevend deep sleep by changing the power management, but I have no idea if it had any affect.

My other idea was that it may be an exception or a hard fault, and I tried setting CONFIG_REBOOT=n to see if that changes anything, but it doesn't. The compiler just does not change it to false and gives me information that, after looking on the internet, I couldn't do anything with.

Has anyone some tips why is this happening?

OS: Windows

SDK: 2.3.0

IDE: Visual Studio Code

Hardware: nRF9160 Development Kid

LTE Link Monitor:

2023-03-20T12:08:23.597Z INFO Using nrf-device-lib-js version: 0.5.0
2023-03-20T12:08:23.598Z INFO Using nrf-device-lib version: 0.13.11
2023-03-20T12:08:23.598Z INFO Using nrfjprog DLL version: 10.18.2
2023-03-20T12:08:23.598Z INFO Using JLink version: JLink_V7.80c
2023-03-20T12:08:23.792Z INFO Installed JLink version does not match the provided version (V7.66a)
2023-03-20T12:08:37.442Z INFO Modem port is opened
2023-03-20T12:08:37.450Z DEBUG modem >> AT+CFUN?
2023-03-20T12:08:38.316Z DEBUG modem << [00:00:02.699,401] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:08:39.365Z DEBUG modem << [00:00:03.746,032] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:08:39.370Z DEBUG modem << [0m
2023-03-20T12:08:39.372Z DEBUG modem << [00:00:03.789,520] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:08:39.374Z DEBUG modem << [0m
2023-03-20T12:08:44.419Z DEBUG modem << [00:00:08.800,781] [0m<inf> aero_sens2: Network registration status: Connected - roaming
2023-03-20T12:08:44.423Z DEBUG modem << [0m
2023-03-20T12:08:44.427Z DEBUG modem << [00:00:08.800,933] [0m<inf> aero_sens2: Got semaphore[0m
2023-03-20T12:08:44.432Z DEBUG modem << [00:00:08.802,154] [0m<inf> aero_sens2: PSM parameter update: TAU: 5760, Active time: 60
2023-03-20T12:08:44.434Z DEBUG modem << [0m
2023-03-20T12:08:44.439Z DEBUG modem << [00:00:08.984,741] [0m<inf> aero_sens2: IPv4 Address found 3.123.222.80[0m
2023-03-20T12:08:44.444Z DEBUG modem << [00:00:08.984,771] [0m<inf> aero_sens2: TLS enabled[0m
2023-03-20T12:08:44.451Z DEBUG modem << [00:00:08.984,771] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:08:48.149Z DEBUG modem << [00:00:12.534,576] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:08:48.155Z DEBUG modem << 
2023-03-20T12:08:48.158Z DEBUG modem << [00:00:12.534,667] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:08:48.160Z DEBUG modem << [00:00:12.536,041] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:08:48.162Z DEBUG modem << 
2023-03-20T12:08:48.166Z DEBUG modem << [00:00:12.537,200] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:08:48.167Z DEBUG modem << 
2023-03-20T12:08:48.173Z DEBUG modem << [00:00:12.539,276] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:08:51.762Z DEBUG modem << [00:00:16.147,125] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:08:51.768Z DEBUG modem << [0m
2023-03-20T12:08:51.775Z DEBUG modem << [00:00:16.539,367] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:08:51.778Z DEBUG modem << [00:00:16.650,909] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:08:51.779Z DEBUG modem << [0m
2023-03-20T12:08:55.927Z DEBUG modem << [00:00:20.312,713] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:08:55.934Z DEBUG modem << [00:00:20.312,805] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:08:55.938Z DEBUG modem << [00:00:20.314,147] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:08:55.940Z DEBUG modem << 
2023-03-20T12:08:55.944Z DEBUG modem << [00:00:20.315,338] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:08:55.945Z DEBUG modem << 
2023-03-20T12:08:55.950Z DEBUG modem << [00:00:20.317,382] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:08:59.499Z DEBUG modem << [00:00:23.884,307] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:08:59.505Z DEBUG modem << [0m
2023-03-20T12:08:59.507Z DEBUG modem << [00:00:24.317,474] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:08:59.510Z DEBUG modem << [00:00:24.420,135] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:08:59.511Z DEBUG modem << [0m
2023-03-20T12:09:04.622Z DEBUG modem << *** Booting Zephyr OS build v3.2.99-ncs2 ***
2023-03-20T12:09:04.630Z DEBUG modem << [00:00:00.494,140] [0m<inf> aero_sens2: Lets start[0m
2023-03-20T12:09:06.682Z DEBUG modem << [00:00:02.551,177] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:09:06.684Z DEBUG modem << 
2023-03-20T12:09:06.691Z DEBUG modem << [00:00:03.552,185] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:09:06.692Z DEBUG modem << [0m
2023-03-20T12:09:07.725Z DEBUG modem << [00:00:03.595,581] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:09:07.731Z DEBUG modem << [0m
2023-03-20T12:09:09.905Z DEBUG modem << [00:00:05.773,040] [0m<inf> aero_sens2: Network registration status: Connected - roaming
2023-03-20T12:09:09.916Z DEBUG modem << [0m
2023-03-20T12:09:09.920Z DEBUG modem << [00:00:05.773,162] [0m<inf> aero_sens2: Got semaphore[0m
2023-03-20T12:09:09.921Z DEBUG modem << [00:00:05.774,383] [0m<inf> aero_sens2: PSM parameter update: TAU: 3960, Active time: 60
2023-03-20T12:09:09.923Z DEBUG modem << [0m
2023-03-20T12:09:09.926Z DEBUG modem << [00:00:05.973,724] [0m<inf> aero_sens2: IPv4 Address found 3.127.15.183[0m
2023-03-20T12:09:09.927Z DEBUG modem << 
2023-03-20T12:09:09.931Z DEBUG modem << [00:00:05.973,754] [0m<inf> aero_sens2: TLS enabled[0m
2023-03-20T12:09:09.932Z DEBUG modem << 
2023-03-20T12:09:09.941Z DEBUG modem << [00:00:05.973,754] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:09:14.669Z DEBUG modem << [00:00:10.539,886] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:09:14.678Z DEBUG modem << [00:00:10.540,008] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:09:14.680Z DEBUG modem << [00:00:10.541,381] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:09:14.685Z DEBUG modem << [00:00:10.542,480] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:09:14.687Z DEBUG modem << 
2023-03-20T12:09:14.692Z DEBUG modem << [00:00:10.544,433] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:09:14.693Z DEBUG modem << 
2023-03-20T12:09:18.386Z DEBUG modem << [00:00:14.257,141] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:09:18.388Z DEBUG modem << [0m
2023-03-20T12:09:18.391Z DEBUG modem << [00:00:14.544,525] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:09:18.404Z DEBUG modem << [00:00:14.665,924] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:09:18.405Z DEBUG modem << [0m
2023-03-20T12:09:22.922Z DEBUG modem << [00:00:18.793,701] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:09:22.932Z DEBUG modem << [00:00:18.793,823] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:09:22.935Z DEBUG modem << [00:00:18.795,135] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:09:22.945Z DEBUG modem << [00:00:18.796,234] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:09:22.946Z DEBUG modem << [00:00:18.798,370] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:09:26.377Z DEBUG modem << [00:00:22.249,237] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:09:26.387Z DEBUG modem << [0m
2023-03-20T12:09:26.389Z DEBUG modem << [00:00:22.798,461] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:09:26.392Z DEBUG modem << [00:00:22.896,179] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:09:26.393Z DEBUG modem << [0m
2023-03-20T12:09:31.376Z DEBUG modem << *** Booting Zephyr OS build v3.2.99-ncs2 ***
2023-03-20T12:09:31.385Z DEBUG modem << 
2023-03-20T12:09:31.388Z DEBUG modem << [00:00:00.493,988] [0m<inf> aero_sens2: Lets start[0m
2023-03-20T12:09:33.435Z DEBUG modem << [00:00:02.550,994] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:09:33.445Z DEBUG modem << 
2023-03-20T12:09:34.484Z DEBUG modem << [00:00:03.598,236] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:09:34.487Z DEBUG modem << [0m
2023-03-20T12:09:34.490Z DEBUG modem << [00:00:03.642,608] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:09:34.492Z DEBUG modem << [0m
2023-03-20T12:09:38.771Z DEBUG modem << [00:00:07.885,864] [0m<inf> aero_sens2: Network registration status: Connected - roaming
2023-03-20T12:09:38.782Z DEBUG modem << [0m
2023-03-20T12:09:38.785Z DEBUG modem << [00:00:07.886,016] [0m<inf> aero_sens2: Got semaphore[0m
2023-03-20T12:09:38.787Z DEBUG modem << [00:00:07.887,237] [0m<inf> aero_sens2: PSM parameter update: TAU: 4320, Active time: 60
2023-03-20T12:09:38.788Z DEBUG modem << [0m
2023-03-20T12:09:38.792Z DEBUG modem << [00:00:08.128,814] [0m<inf> aero_sens2: IPv4 Address found 3.124.136.60[0m
2023-03-20T12:09:38.797Z DEBUG modem << [00:00:08.128,845] [0m<inf> aero_sens2: TLS enabled[0m
2023-03-20T12:09:38.798Z DEBUG modem << 
2023-03-20T12:09:38.811Z DEBUG modem << [00:00:08.128,875] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:09:42.514Z DEBUG modem << [00:00:11.631,530] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:09:42.526Z DEBUG modem << [00:00:11.631,652] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:09:42.527Z DEBUG modem << [00:00:11.633,026] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:09:42.530Z DEBUG modem << [00:00:11.634,124] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:09:42.532Z DEBUG modem << 
2023-03-20T12:09:42.537Z DEBUG modem << [00:00:11.636,230] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:09:42.538Z DEBUG modem << 
2023-03-20T12:09:46.218Z DEBUG modem << [00:00:15.335,205] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:09:46.230Z DEBUG modem << [0m
2023-03-20T12:09:46.234Z DEBUG modem << [00:00:15.636,322] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:09:46.235Z DEBUG modem << [00:00:15.751,983] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:09:46.236Z DEBUG modem << [0m
2023-03-20T12:09:50.414Z DEBUG modem << [00:00:19.531,982] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:09:50.427Z DEBUG modem << [00:00:19.532,073] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:09:50.429Z DEBUG modem << [00:00:19.533,416] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:09:50.432Z DEBUG modem << [00:00:19.534,545] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:09:50.437Z DEBUG modem << [00:00:19.536,590] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:09:50.439Z DEBUG modem << 
2023-03-20T12:09:54.170Z DEBUG modem << [00:00:23.287,597] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:09:54.183Z DEBUG modem << [0m
2023-03-20T12:09:54.185Z DEBUG modem << [00:00:23.536,682] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:09:54.187Z DEBUG modem << [00:00:23.632,232] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:09:54.188Z DEBUG modem << [0m
2023-03-20T12:09:58.912Z DEBUG modem << *** Booting Zephyr OS build v3.2.99-ncs2 ***
2023-03-20T12:09:58.924Z DEBUG modem << 
2023-03-20T12:09:58.926Z DEBUG modem << [00:00:00.493,774] [0m<inf> aero_sens2: Lets start[0m
2023-03-20T12:10:00.971Z DEBUG modem << [00:00:02.550,811] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:10:02.005Z DEBUG modem << [00:00:03.582,153] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:10:02.017Z DEBUG modem << [0m
2023-03-20T12:10:02.019Z DEBUG modem << [00:00:03.639,495] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:02.021Z DEBUG modem << [0m
2023-03-20T12:10:04.257Z DEBUG modem << [00:00:05.834,716] [0m<inf> aero_sens2: Network registration status: Connected - roaming
2023-03-20T12:10:04.270Z DEBUG modem << [0m
2023-03-20T12:10:04.273Z DEBUG modem << [00:00:05.834,869] [0m<inf> aero_sens2: Got semaphore[0m
2023-03-20T12:10:04.275Z DEBUG modem << [00:00:05.836,059] [0m<inf> aero_sens2: PSM parameter update: TAU: 6120, Active time: 60
2023-03-20T12:10:04.275Z DEBUG modem << [0m
2023-03-20T12:10:05.494Z DEBUG modem << [00:00:07.073,669] [0m<inf> aero_sens2: IPv4 Address found 18.192.60.140[0m
2023-03-20T12:10:05.509Z DEBUG modem << [00:00:07.073,699] [0m<inf> aero_sens2: TLS enabled[0m
2023-03-20T12:10:05.510Z DEBUG modem << [00:00:07.073,730] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:10:08.938Z DEBUG modem << [00:00:10.519,409] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:10:08.957Z DEBUG modem << [00:00:10.519,500] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:10:08.958Z DEBUG modem << [00:00:10.520,874] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:10:08.960Z DEBUG modem << [00:00:10.521,972] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:10:08.962Z DEBUG modem << [00:00:10.524,108] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:10:12.943Z DEBUG modem << [00:00:14.524,200] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:10:12.966Z DEBUG modem << [00:00:15.320,159] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:10:12.968Z DEBUG modem << [0m
2023-03-20T12:10:12.969Z DEBUG modem << [00:00:15.505,889] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:12.970Z DEBUG modem << [0m
2023-03-20T12:10:19.712Z DEBUG modem << [00:00:21.293,121] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:10:19.730Z DEBUG modem << [00:00:21.293,212] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:10:19.731Z DEBUG modem << [00:00:21.294,525] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:10:19.733Z DEBUG modem << [00:00:21.295,623] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:10:19.748Z DEBUG modem << [00:00:21.297,668] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:10:23.676Z DEBUG modem << [00:00:25.257,324] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:10:23.692Z DEBUG modem << [0m
2023-03-20T12:10:23.694Z DEBUG modem << [00:00:25.297,760] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:10:23.695Z DEBUG modem << [00:00:25.356,170] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:23.696Z DEBUG modem << [0m
2023-03-20T12:10:28.610Z DEBUG modem << *** Booting Zephyr OS build v3.2.99-ncs2 ***
2023-03-20T12:10:28.627Z DEBUG modem << 
2023-03-20T12:10:28.629Z DEBUG modem << [00:00:00.493,957] [0m<inf> aero_sens2: Lets start[0m
2023-03-20T12:10:30.670Z DEBUG modem << [00:00:02.550,994] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:10:31.685Z DEBUG modem << [00:00:03.564,056] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:10:31.700Z DEBUG modem << [0m
2023-03-20T12:10:31.702Z DEBUG modem << [00:00:03.617,553] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:31.703Z DEBUG modem << [0m
2023-03-20T12:10:33.945Z DEBUG modem << [00:00:05.824,737] [0m<inf> aero_sens2: Network registration status: Connected - roaming
2023-03-20T12:10:33.962Z DEBUG modem << [0m
2023-03-20T12:10:33.967Z DEBUG modem << [00:00:05.824,890] [0m<inf> aero_sens2: Got semaphore[0m
2023-03-20T12:10:33.969Z DEBUG modem << [00:00:05.826,080] [0m<inf> aero_sens2: PSM parameter update: TAU: 5760, Active time: 60
2023-03-20T12:10:33.970Z DEBUG modem << [0m
2023-03-20T12:10:33.975Z DEBUG modem << [00:00:05.978,424] [0m<inf> aero_sens2: IPv4 Address found 35.157.131.254[0m
2023-03-20T12:10:33.976Z DEBUG modem << [00:00:05.978,454] [0m<inf> aero_sens2: TLS enabled[0m
2023-03-20T12:10:33.992Z DEBUG modem << [00:00:05.978,454] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:10:37.829Z DEBUG modem << [00:00:09.711,425] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:10:37.845Z DEBUG modem << 
2023-03-20T12:10:37.848Z DEBUG modem << [00:00:09.711,547] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:10:37.850Z DEBUG modem << [00:00:09.712,921] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:10:37.851Z DEBUG modem << [00:00:09.713,989] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:10:37.852Z DEBUG modem << [00:00:09.716,094] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:10:41.596Z DEBUG modem << [00:00:13.478,973] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:10:41.612Z DEBUG modem << [0m
2023-03-20T12:10:41.614Z DEBUG modem << [00:00:13.716,186] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:10:41.616Z DEBUG modem << [00:00:13.837,860] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:41.617Z DEBUG modem << [0m
2023-03-20T12:10:45.792Z DEBUG modem << [00:00:17.674,682] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:10:45.809Z DEBUG modem << 
2023-03-20T12:10:45.812Z DEBUG modem << [00:00:17.674,804] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:10:45.814Z DEBUG modem << [00:00:17.676,116] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:10:45.815Z DEBUG modem << [00:00:17.677,215] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:10:45.817Z DEBUG modem << [00:00:17.679,290] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:10:49.435Z DEBUG modem << [00:00:21.318,145] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:10:49.456Z DEBUG modem << [0m
2023-03-20T12:10:49.459Z DEBUG modem << [00:00:21.679,382] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:10:49.461Z DEBUG modem << [00:00:21.798,095] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:49.462Z DEBUG modem << [0m
2023-03-20T12:10:54.950Z DEBUG modem << *** Booting Zephyr OS build v3.2.99-ncs2 ***
2023-03-20T12:10:54.970Z DEBUG modem << [00:00:00.493,774] [0m<inf> aero_sens2: Lets start[0m
2023-03-20T12:10:57.009Z DEBUG modem << [00:00:02.550,811] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:10:57.030Z DEBUG modem << 
2023-03-20T12:10:57.034Z DEBUG modem << [00:00:03.544,219] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:10:57.036Z DEBUG modem << [0m
2023-03-20T12:10:58.075Z DEBUG modem << [00:00:03.617,584] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:10:58.093Z DEBUG modem << [0m
2023-03-20T12:11:00.425Z DEBUG modem << [00:00:05.965,057] [0m<inf> aero_sens2: Network registration status: Connected - roaming
2023-03-20T12:11:00.445Z DEBUG modem << [0m
2023-03-20T12:11:00.448Z DEBUG modem << [00:00:05.965,209] [0m<inf> aero_sens2: Got semaphore[0m
2023-03-20T12:11:00.449Z DEBUG modem << [00:00:05.966,369] [0m<inf> aero_sens2: PSM parameter update: TAU: 5040, Active time: 60
2023-03-20T12:11:00.450Z DEBUG modem << [0m
2023-03-20T12:11:00.451Z DEBUG modem << [00:00:06.159,454] [0m<inf> aero_sens2: IPv4 Address found 3.127.15.183[0m
2023-03-20T12:11:00.453Z DEBUG modem << [00:00:06.159,484] [0m<inf> aero_sens2: TLS enabled[0m
2023-03-20T12:11:00.456Z DEBUG modem << [00:00:06.159,484] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:11:00.457Z DEBUG modem << 
2023-03-20T12:11:04.665Z DEBUG modem << [00:00:10.207,855] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:11:04.687Z DEBUG modem << [00:00:10.207,946] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:11:04.689Z DEBUG modem << [00:00:10.209,320] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:11:04.691Z DEBUG modem << [00:00:10.210,510] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:11:04.693Z DEBUG modem << [00:00:10.212,463] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:11:08.164Z DEBUG modem << [00:00:13.706,695] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:11:08.185Z DEBUG modem << [0m
2023-03-20T12:11:08.189Z DEBUG modem << [00:00:14.212,554] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:11:08.191Z DEBUG modem << [00:00:14.327,941] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:11:08.193Z DEBUG modem << [0m
2023-03-20T12:11:13.264Z DEBUG modem << [00:00:18.806,732] [0m<inf> aero_sens2: mqtt input![0m
2023-03-20T12:11:13.287Z DEBUG modem << [00:00:18.806,854] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-20T12:11:13.289Z DEBUG modem << [00:00:18.808,166] [0m<inf> aero_sens2: Publish![0m
2023-03-20T12:11:13.291Z DEBUG modem << [00:00:18.809,234] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-20T12:11:13.292Z DEBUG modem << [00:00:18.811,309] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-20T12:11:16.973Z DEBUG modem << [00:00:22.516,601] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-20T12:11:16.997Z DEBUG modem << [0m
2023-03-20T12:11:16.999Z DEBUG modem << [00:00:22.811,401] [0m<inf> aero_sens2: Connecting![0m
2023-03-20T12:11:17.001Z DEBUG modem << [00:00:22.928,192] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-20T12:11:17.002Z DEBUG modem << [0m
2023-03-20T12:11:21.933Z DEBUG modem << *** Booting Zephyr OS build v3.2.99-ncs2 ***
2023-03-20T12:11:21.955Z DEBUG modem << 
2023-03-20T12:11:21.959Z DEBUG modem << [00:00:00.493,927] [0m<inf> aero_sens2: Lets start[0m
2023-03-20T12:11:23.992Z DEBUG modem << [00:00:02.550,994] [0m<inf> aero_sens2: waiting for the semphore![0m
2023-03-20T12:11:24.021Z DEBUG modem << 
2023-03-20T12:11:24.027Z DEBUG modem << [00:00:03.518,035] [0m<inf> aero_sens2: LTE cell changed: Cell ID: 18298629, Tracking area: 303
2023-03-20T12:11:24.028Z DEBUG modem << [0m

main.c

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/printk.h>
#include <zephyr/logging/log.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <zephyr/init.h>
#include <zephyr/pm/pm.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/policy.h>

#include <modem/lte_lc.h>
#include <modem/modem_info.h>
#include <nrf_modem_at.h>

#include <zephyr/net/socket.h>
#include <zephyr/net/mqtt.h>

#include "common_struct.h"
#include "json_lib.h"


#define SLEEP_TIME_MS   4*1000


static K_SEM_DEFINE(lte_connected, 0, 1);

LOG_MODULE_REGISTER(aero_sens2,LOG_LEVEL_DBG);

static void lte_handler(const struct lte_lc_evt *const evt);
static int broker_init(void);
void mqtt_evt_handler(struct mqtt_client *const c,
		      const struct mqtt_evt *vt);

// The mqtt client struct 
static struct mqtt_client client;

/* MQTT Broker details. */
static struct sockaddr_storage broker;

// File descriptor 
static struct pollfd fds;

// data and medata
static aero_sens_metadata_t data;


/* Buffers for MQTT client. */
static uint8_t rx_buffer[128];
static uint8_t tx_buffer[128];
static uint8_t payload_buf[128];


/* Prevent deep sleep (system off) from being entered on long timeouts
 * or `K_FOREVER` due to the default residency policy.
 *
 * This has to be done before anything tries to sleep, which means
 * before the threading system starts up between PRE_KERNEL_2 and
 * POST_KERNEL.  Do it at the start of PRE_KERNEL_2.
 */

static int disable_ds_1(const struct device *dev)
{
	ARG_UNUSED(dev);

	pm_policy_state_lock_get(PM_STATE_SOFT_OFF, PM_ALL_SUBSTATES);
	return 0;
}

SYS_INIT(disable_ds_1, PRE_KERNEL_2, 0);


static int json_add_obj(cJSON *parent, const char *str, cJSON *item)
{
	cJSON_AddItemToObject(parent, str, item);

	return 0;
}



static int json_add_number(cJSON *parent, const char *str, double item)
{
	cJSON *json_num;

	json_num = cJSON_CreateNumber(item);
	if (json_num == NULL) {
		return -ENOMEM;
	}

	return json_add_obj(parent, str, json_num);
}



void main(void)
{
	int err;
	struct mqtt_publish_param param;
	LOG_INF("Lets start");
	k_msleep(2000);


	err = lte_lc_init_and_connect_async(lte_handler);
	if (err) {
		LOG_ERR("Modem could not be configured, error: %d\n", err);
		return ;
	}

	err = modem_info_init();
	if (err) {
		LOG_ERR("Failed initializing modem info module, error: %d\n",
		err);
	}

	LOG_INF("waiting for the semphore!");
	k_sem_take(&lte_connected, K_FOREVER);
	LOG_INF("Got semaphore");
	cJSON_Init();

	mqtt_client_init(&client);

	/* Resolves the configured hostname and initializes the MQTT broker structure */
	err = broker_init();
	if (err) {
		LOG_ERR("Failed to initialize broker connection");
		k_msleep(25);
		err = broker_init();
		if (err) {
			LOG_ERR("Failed to initialize broker connection");
			return;
		}

	}

	/* MQTT client configuration */
	client.broker = &broker;
	client.evt_cb = mqtt_evt_handler;
	client.client_id.utf8 = "test-123";//client_id_get();
	client.client_id.size = 8;//strlen(client->client_id.utf8);
	client.password = NULL;
	client.user_name = NULL;
	client.protocol_version = MQTT_VERSION_3_1_1;

	/* MQTT buffers configuration */
	client.rx_buf = rx_buffer;
	client.rx_buf_size = sizeof(rx_buffer);
	client.tx_buf = tx_buffer;
	client.tx_buf_size = sizeof(tx_buffer);

	//get a pointer to the TLS configration 
	struct mqtt_sec_config *tls_cfg = &(client.transport).tls.config;
	static sec_tag_t sec_tag_list[] = { CONFIG_MQTT_TLS_SEC_TAG };

	LOG_INF("TLS enabled");
	client.transport.type = MQTT_TRANSPORT_SECURE;

	tls_cfg->peer_verify = CONFIG_MQTT_TLS_PEER_VERIFY; // verfiy required
	tls_cfg->cipher_list = NULL;
	tls_cfg->cipher_count = 0;
	tls_cfg->sec_tag_count = ARRAY_SIZE(sec_tag_list);
	tls_cfg->sec_tag_list = sec_tag_list;
	tls_cfg->hostname = CONFIG_MQTT_BROKER_HOSTNAME;

	tls_cfg->session_cache = TLS_SESSION_CACHE_DISABLED ;

	while (1) {
    LOG_INF("Connecting!");
    //k_msleep(1);
    err = mqtt_connect(&client);
		if (err) {
			LOG_INF("Error in mqtt_connect: %d", err);

		}

    fds.fd = client.transport.tls.sock;
    fds.events = POLLIN;
    
  	err = poll(&fds, 1, mqtt_keepalive_time_left(&client));
	  if (err < 0) {
		  LOG_INF("Error in poll(): %d", err);
		  return ;
	  }

    LOG_INF("mqtt input!");
    err = mqtt_input(&client);
		if (err != 0) {
			LOG_INF("Error in mqtt_input: %d", err);
			return ;
		}
	//char* message; = json_create(&data);
	{
		char* message;
		cJSON *reported_obj = cJSON_CreateObject();
		cJSON *bms_680 = cJSON_CreateObject();
		err += json_add_number(reported_obj, "pckt",  1);
		err += json_add_number(reported_obj, "bat",  data.bat_voltage);
		err += json_add_number(reported_obj, "rsrp",  data.rsrp);

		err += json_add_number(bms_680, "tmp_exp",  data.temp.val1);
		err += json_add_number(bms_680, "tmp_frc",  data.temp.val2);
		err += json_add_number(bms_680, "psr_exp", data.press.val1);
		err += json_add_number(bms_680, "hum_exp",  data.humidity.val1);
		err += json_add_number(bms_680, "gas_exp", data.gas_res.val1);
		err += json_add_number(bms_680, "alrm", 0);

		err += json_add_obj(reported_obj , "bms860", bms_680);

		if (err) {
			LOG_ERR("json_add, error: %d", err);
		}
		message = cJSON_Print(reported_obj);
		param.message.topic.qos = MQTT_QOS_1_AT_LEAST_ONCE;
		param.message.topic.topic.utf8 = "test/topic1";
		param.message.topic.topic.size = strlen("test/topic1");
		param.message.payload.data = (uint8_t*)message;
		param.message.payload.len = strlen(message);
		param.message_id = 12;
		param.dup_flag = 0;
		param.retain_flag = 0;
		LOG_INF("Publish!");
		mqtt_publish(&client, &param);
		cJSON_FreeString(message);

	}
    



    LOG_INF("Disconnecting MQTT!");
		err = mqtt_disconnect(&client);
		if (err) {
			LOG_ERR("Could not disconnect MQTT client: %d", err);
		}
    k_msleep(SLEEP_TIME_MS); 
	}
}


static void lte_handler(const struct lte_lc_evt *const evt)
{
     switch (evt->type) {

     case LTE_LC_EVT_NW_REG_STATUS:
        if ((evt->nw_reg_status != LTE_LC_NW_REG_REGISTERED_HOME) &&
            (evt->nw_reg_status != LTE_LC_NW_REG_REGISTERED_ROAMING)) {
            break;
        }
            LOG_INF("Network registration status: %s\n",
			    evt->nw_reg_status == LTE_LC_NW_REG_REGISTERED_HOME ?
			    "Connected - home network" : "Connected - roaming");
		//lte_connected=true;
		k_sem_give(&lte_connected);
        break;

    case LTE_LC_EVT_PSM_UPDATE:
		LOG_INF("PSM parameter update: TAU: %d, Active time: %d\n",
			evt->psm_cfg.tau, evt->psm_cfg.active_time);
		break;

 	case LTE_LC_EVT_EDRX_UPDATE: {
		char log_buf[60];
		ssize_t len;

		len = snprintf(log_buf, sizeof(log_buf),
			       "eDRX parameter update: eDRX: %f, PTW: %f",
			       evt->edrx_cfg.edrx, evt->edrx_cfg.ptw);
		if (len > 0) {
			printk("%s\n", log_buf);
		}
		break;
	}      

	case LTE_LC_EVT_RRC_UPDATE:
		 LOG_INF("RRC mode: %s\n", evt->rrc_mode == LTE_LC_RRC_MODE_CONNECTED ? "Connected" : "Idle");
		break;

	case LTE_LC_EVT_CELL_UPDATE:
		LOG_INF("LTE cell changed: Cell ID: %d, Tracking area: %d\n",
			evt->cell.id, evt->cell.tac);
		break;	

     default:
        break;
    }
}

/**@brief Resolves the configured hostname and
 * initializes the MQTT broker structure
 */
static int broker_init(void)
{
	int err;
	struct addrinfo *result;
	struct addrinfo *addr;
	struct addrinfo hints = {
		.ai_family = AF_INET,
		.ai_socktype = SOCK_STREAM
	};

	err = getaddrinfo(CONFIG_MQTT_BROKER_HOSTNAME, NULL, &hints, &result);
	if (err) {
		LOG_ERR("getaddrinfo failed: %d", err);
		return -ECHILD;
	}

	addr = result;

	/* Look for address of the broker. */
	while (addr != NULL) {
		/* IPv4 Address. */
		if (addr->ai_addrlen == sizeof(struct sockaddr_in)) {
			struct sockaddr_in *broker4 =
				((struct sockaddr_in *)&broker);
			char ipv4_addr[NET_IPV4_ADDR_LEN];

			broker4->sin_addr.s_addr =
				((struct sockaddr_in *)addr->ai_addr)
				->sin_addr.s_addr;
			broker4->sin_family = AF_INET;
			broker4->sin_port = htons(8883);

			inet_ntop(AF_INET, &broker4->sin_addr.s_addr,
				  ipv4_addr, sizeof(ipv4_addr));
			LOG_INF("IPv4 Address found %s", (char *)(ipv4_addr));

			break;
		} else {
			LOG_ERR("ai_addrlen = %u should be %u or %u",
				(unsigned int)addr->ai_addrlen,
				(unsigned int)sizeof(struct sockaddr_in),
				(unsigned int)sizeof(struct sockaddr_in6));
		}

		addr = addr->ai_next;
	}

	/* Free the address. */
	freeaddrinfo(result);

	return err;
}
static int get_received_payload(struct mqtt_client *c, size_t length)
{
	int ret;
	int err = 0;

	/* Return an error if the payload is larger than the payload buffer.
	 * Note: To allow new messages, we have to read the payload before returning.
	 */
	if (length > sizeof(payload_buf)) {
		err = -EMSGSIZE;
	}

	/* Truncate payload until it fits in the payload buffer. */
	while (length > sizeof(payload_buf)) {
		ret = mqtt_read_publish_payload_blocking(
				c, payload_buf, (length - sizeof(payload_buf)));
		if (ret == 0) {
			return -EIO;
		} else if (ret < 0) {
			return ret;
		}

		length -= ret;
	}

	ret = mqtt_readall_publish_payload(c, payload_buf, length);
	if (ret) {
		return ret;
	}

	return err;
}  
static void data_print(uint8_t *prefix, uint8_t *data, size_t len)
{
	char buf[len + 1];

	memcpy(buf, data, len);
	buf[len] = 0;
	LOG_INF("%s%s", (char *)prefix, (char *)buf);
}

void mqtt_evt_handler(struct mqtt_client *const c,
		      const struct mqtt_evt *evt)
{
	int err;

	switch (evt->type) {
	case MQTT_EVT_CONNACK:
		if (evt->result != 0) {
			LOG_ERR("MQTT connect failed: %d", evt->result);
			break;
		}

		LOG_INF("MQTT client connected");
		//subscribe(c);
		break;

	case MQTT_EVT_DISCONNECT:
		LOG_INF("MQTT client disconnected: %d", evt->result);
		break;

	case MQTT_EVT_PUBLISH:
	{
		const struct mqtt_publish_param *p = &evt->param.publish;
		//Print the length of the recived message 
		LOG_INF("MQTT PUBLISH result=%d len=%d",
			evt->result, p->message.payload.len);

		//json_release_mem();
		//Extract the data of the recived message 
		err = get_received_payload(c, p->message.payload.len);
		
		//Send acknowledgment to the broker on receiving QoS1 publish message 
		if (p->message.topic.qos == MQTT_QOS_1_AT_LEAST_ONCE) {
			const struct mqtt_puback_param ack = {
				.message_id = p->message_id
			};

			/* Send acknowledgment. */
			mqtt_publish_qos1_ack(c, &ack);
		}
		
		//On successful extraction of data 
		if (err >= 0) {
			data_print("Received: ", payload_buf, p->message.payload.len);
	
		// On failed extraction of data - Payload buffer is smaller than the recived data . Increase 
		} else if (err == -EMSGSIZE) {
			LOG_ERR("Received payload (%d bytes) is larger than the payload buffer "
				"size (%d bytes).",
				p->message.payload.len, sizeof(payload_buf));
		//On failed extraction of data - Failed to extract data, disconnect 
		} else {
			LOG_ERR("get_received_payload failed: %d", err);
			LOG_INF("Disconnecting MQTT client...");

			err = mqtt_disconnect(c);
			if (err) {
				LOG_ERR("Could not disconnect: %d", err);
			}
		}
	} break;

	case MQTT_EVT_PUBACK:
		if (evt->result != 0) {
			LOG_ERR("MQTT PUBACK error: %d", evt->result);
			break;
		}

		LOG_INF("PUBACK packet id: %u", evt->param.puback.message_id);
		break;

	case MQTT_EVT_SUBACK:
		if (evt->result != 0) {
			LOG_ERR("MQTT SUBACK error: %d", evt->result);
			break;
		}

		LOG_INF("SUBACK packet id: %u", evt->param.suback.message_id);
		break;

	case MQTT_EVT_PINGRESP:
		if (evt->result != 0) {
			LOG_ERR("MQTT PINGRESP error: %d", evt->result);
		}
		break;

	default:
		LOG_INF("Unhandled MQTT event type: %d", evt->type);
		break;
	}
}

Update:

prj.conf:

# For logging
CONFIG_LOG=y

# NEWLIB C
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

# Network
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n

# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_NETWORK_MODE_LTE_M=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

# Modem library
CONFIG_NRF_MODEM_LIB=y

# Modem information
CONFIG_MODEM_INFO=y

CONFIG_AWS_IOT=y
CONFIG_AWS_IOT_CLIENT_ID_STATIC="aero_sens"
CONFIG_AWS_IOT_BROKER_HOST_NAME="example.endpoint.com"
CONFIG_AWS_IOT_SEC_TAG=201
CONFIG_AWS_IOT_APP_SUBSCRIPTION_LIST_COUNT=2
CONFIG_AWS_IOT_TOPIC_UPDATE_DELTA_SUBSCRIBE=y
CONFIG_AWS_IOT_LAST_WILL=y
CONFIG_AWS_IOT_TOPIC_GET_ACCEPTED_SUBSCRIBE=y
CONFIG_AWS_IOT_TOPIC_GET_REJECTED_SUBSCRIBE=y

# MQTT - Maximum MQTT keepalive timeout specified by AWS IoT Core (in Sec)
CONFIG_MQTT_KEEPALIVE=1200  


# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=2048
CONFIG_MAIN_STACK_SIZE=2048
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# CJSON
CONFIG_CJSON_LIB=y

CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_THREAD_NAME=y

# CONFIG_PM=y
# CONFIG_PM_DEVICE=y

LTE Link Monitor 2:

2023-03-21T16:29:45.568Z INFO Using nrf-device-lib-js version: 0.5.0
2023-03-21T16:29:45.568Z INFO Using nrf-device-lib version: 0.13.11
2023-03-21T16:29:45.569Z INFO Using nrfjprog DLL version: 10.18.2
2023-03-21T16:29:45.569Z INFO Using JLink version: JLink_V7.80c
2023-03-21T16:29:45.671Z INFO Installed JLink version does not match the provided version (V7.66a)
2023-03-21T16:29:47.167Z INFO Modem port is opened
2023-03-21T16:29:47.176Z DEBUG modem >> AT+CFUN?
2023-03-21T16:31:32.863Z INFO Modem port is opened
2023-03-21T16:31:32.865Z DEBUG modem >> AT+CFUN?
2023-03-21T16:31:36.226Z DEBUG modem << [00:00:06.676,605] [0m<inf> aero_sens2: mqtt input![0m
2023-03-21T16:31:36.232Z DEBUG modem << [00:00:06.676,727] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-21T16:31:36.237Z DEBUG modem << [00:00:06.678,161] [0m<inf> aero_sens2: Publish![0m
2023-03-21T16:31:36.270Z DEBUG modem << [00:00:06.679,565] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-21T16:31:36.272Z DEBUG modem << [00:00:06.681,365] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-21T16:31:39.859Z DEBUG modem << [00:00:10.309,875] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-21T16:31:39.864Z DEBUG modem << [0m
2023-03-21T16:31:44.231Z DEBUG modem << [00:00:14.681,488] [0m<inf> aero_sens2: Connecting![0m
2023-03-21T16:31:44.236Z DEBUG modem << [00:00:14.775,817] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-21T16:31:44.238Z DEBUG modem << [0m
2023-03-21T16:31:47.899Z DEBUG modem << [00:00:18.349,945] [0m<inf> aero_sens2: mqtt input![0m
2023-03-21T16:31:47.905Z DEBUG modem << [00:00:18.350,067] [0m<inf> aero_sens2: MQTT client connected[0m
2023-03-21T16:31:47.910Z DEBUG modem << [00:00:18.351,470] [0m<inf> aero_sens2: Publish![0m
2023-03-21T16:31:47.916Z DEBUG modem << [00:00:18.352,874] [0m<inf> aero_sens2: Disconnecting MQTT![0m
2023-03-21T16:31:47.922Z DEBUG modem << [00:00:18.354,736] [0m<inf> aero_sens2: MQTT client disconnected: 0[0m
2023-03-21T16:31:51.491Z DEBUG modem << [00:00:21.942,687] [0m<inf> aero_sens2: RRC mode: Idle
2023-03-21T16:31:51.497Z DEBUG modem << [0m
2023-03-21T16:31:55.904Z DEBUG modem << [00:00:26.354,858] [0m<inf> aero_sens2: Connecting![0m
2023-03-21T16:31:55.910Z DEBUG modem << [00:00:26.456,146] [0m<inf> aero_sens2: RRC mode: Connected
2023-03-21T16:31:55.912Z DEBUG modem << [0m

Thanks for the help!

Didrik Rokhaug · Accepted Answer

J0sh1101 said: Should I add the CONFIG_TFM_SECURE_UART=y? 
 Yes. 
 J0sh1101 said: I noticed that the error occurs whenever there is a context switch in the arch_swap function. 
 Do you have a stack trace before it enters arch_swap? 
 J0sh1101 said: hen I try to remove them, I get an error message. (I have used the AWS IOT example as a base). 
 What error message do you get? 
 The options shouldn't cause the crash you are seeing, but I also cannot see why they cause an error when you remove them.

J0sh1101 · Answer

Hi, 
 
 after careful debugging and going through the code, I found that I had memory leak with the cJson library. I did not free all the memory. I freed the the cJson object but not the char* memory buffer. 
 
 Didrik Rokhaug Thanks for the help 
 
 This is how it should look when you send an mqtt message using the cJson library:

nrf9160 reboots sporadically after some time.

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