Need help connecting to MQTT using nRF9160

[pranav-ether]

I can't figure out what I'm missing. I'm not able to send messages using MQTT.

Here's the link to my code: https://github.com/pranav-ether/test/tree/main/mqtt_pub

This are the logs:

[00:02:58.031,768] <inf> LTE: Network registration status: Connected - home network
[00:02:58.031,890] <inf> LTE: Connected to LTE network
[00:02:58.031,921] <inf> LTE: ====== Cell Network Info ======
[00:02:58.033,477] <inf> LTE: Signal strength: 42
[00:02:58.034,210] <inf> LTE: Current LTE band: 8
[00:02:58.034,912] <inf> LTE: Supported LTE bands: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)
[00:02:58.035,705] <inf> LTE: Tracking area code: 8CA1
[00:02:58.036,468] <inf> LTE: Current mode: 0
[00:02:58.037,200] <inf> LTE: Current operator name: 65501
[00:02:58.038,146] <inf> LTE: Cell ID of the device: 0E446D21
[00:02:58.039,337] <inf> LTE: IP address of the device: 100.67.202.179
[00:02:58.039,886] <inf> LTE: Modem firmware version: mfw_nrf9160_1.3.5
[00:02:58.040,618] <inf> LTE: LTE-M support mode: 0
[00:02:58.041,259] <inf> LTE: NB-IoT support mode: 1
[00:02:58.041,900] <inf> LTE: GPS support mode: 0
[00:02:58.042,633] <inf> LTE: Mobile network time and date: 24/08/13,06:33:37+08
[00:02:58.042,633] <inf> LTE: ===============================
[00:02:58.043,121] <inf> MQTT: Connection to broker using mqtt_init
[00:04:23.972,839] <err> mqtt_helper: Cloud MQTT keepalive ping failed: -128

[Charlie]

Did you make original NCS MQTT sample works MQTT (nordicsemi.com)? Which NCS version are you based on?

[pranav-ether]

The mqtt sample did not work for me. I'm using v2.6.1
Here are the logs for the mqtt sample:

[00:00:00.295,349] <inf> network: Bringing network interface up and connecting to the network
[00:00:00.528,198] <inf> nrf_modem_lib_trace: Trace thread ready
[00:00:00.535,827] <inf> nrf_modem_lib_trace: Trace level override: 2
+CEREG: 2,"8CA1","0E241F17",9
+CSCON: 1
+CSCON: 0
+CSCON: 1
+CGEV: ME PDN ACT 0,0
+CNEC_ESM: 50,0
+CEREG: 1,"8CA1","0E241F17",9,,,"11100000","00000110"
[00:01:47.830,474] <inf> network: Network connectivity established
[00:03:30.036,132] <err> mqtt_helper: Cloud MQTT keepalive ping failed: -128
[00:03:30.036,376] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:03:30.036,407] <err> transport: Failed connecting to MQTT, error code: -95
[00:04:30.037,017] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:04:30.037,048] <err> transport: Failed connecting to MQTT, error code: -95
+CSCON: 0
[00:05:30.046,081] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:05:30.046,112] <err> transport: Failed connecting to MQTT, error code: -95
+CSCON: 1
[00:06:30.046,875] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:06:30.046,905] <err> transport: Failed connecting to MQTT, error code: -95
+CSCON: 0
[00:07:30.055,938] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:07:30.055,969] <err> transport: Failed connecting to MQTT, error code: -95
[00:08:30.065,032] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:08:30.065,063] <err> transport: Failed connecting to MQTT, error code: -95
*** Booting nRF Connect SDK 3758bcbfa5cd ***
[00:00:00.300,537] <inf> network: Bringing network interface up and connecting to the network
[00:00:00.533,386] <inf> nrf_modem_lib_trace: Trace thread ready
[00:00:00.541,015] <inf> nrf_modem_lib_trace: Trace level override: 2
+CEREG: 2,"8CA1","0E241F17",9
+CSCON: 1
+CSCON: 0
+CSCON: 1
+CGEV: ME PDN ACT 0,0
+CNEC_ESM: 50,0
+CEREG: 1,"8CA1","0E241F17",9,,,"11100000","00000110"
[00:01:49.906,158] <inf> network: Network connectivity established
[00:03:32.047,851] <err> mqtt_helper: Cloud MQTT keepalive ping failed: -128
[00:03:32.048,095] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:03:32.048,095] <err> transport: Failed connecting to MQTT, error code: -95
[00:04:32.048,706] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:04:32.048,736] <err> transport: Failed connecting to MQTT, error code: -95
+CSCON: 0
[00:05:32.057,800] <err> mqtt_helper: Library is in the wrong state (MQTT_STATE_CONNECTING), MQTT_STATE_DISCONNECTED required
[00:05:32.057,830] <err> transport: Failed connecting to MQTT, error code: -95

[Charlie]

Ok, I suggest you try to make the official sample work first.

How do you build the sample? Do you use TLS? Do you still have data with your SIM card?

I see you have enabled modem trace, you can share it here for further check.

[pranav-ether]

MQTT sample was built using nrf-connect on VS Code with v2.6.0 toolchain & v2.6.1 SDK. I built the sample without any changes.
Regarding modem trace, what exactly needs to be shared? Wireshark logs?