How to use the MQTT cloud example

Asset Tracker Template
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Asset Tracker Template

  1. Build and flash the application with the MQTT overlay.

    In the template's app folder, run:

    west build -p -b thingy91x/nrf9151/ns -- -DEXTRA_CONF_FILE="$(pwd)/../examples/modules/cloud/overlay-mqtt.conf" && west flash --erase --skip-rebuild

  2. Observe that the device connects to the broker.

  3. Test using shell commands:

    uart:~$ att_cloud_publish_mqtt test-payload
Sending on payload channel: "data":"test-payload","ts":1746534066186 (40 bytes)
[00:00:18.607,421] <dbg> cloud: on_cloud_payload_json: MQTT Publish Details:
[00:00:18.607,482] <dbg> cloud: on_cloud_payload_json:  -Payload: "data":"test-payload","ts":1746534066186
[00:00:18.607,513] <dbg> cloud: on_cloud_payload_json:  -Payload Length: 40
[00:00:18.607,543] <dbg> cloud: on_cloud_payload_json:  -Topic: 359404230261381/att-pub-topic
[00:00:18.607,574] <dbg> cloud: on_cloud_payload_json:  -Topic Size: 29
[00:00:18.607,635] <dbg> cloud: on_cloud_payload_json:  -QoS: 1
[00:00:18.607,635] <dbg> cloud: on_cloud_payload_json:  -Message ID: 1
[00:00:18.607,696] <dbg> mqtt_helper: mqtt_helper_publish: Publishing to topic: 359404230261381/att-pub-topic
[00:00:19.141,235] <dbg> mqtt_helper: mqtt_evt_handler: MQTT_EVT_PUBACK: id = 1 result = 0
[00:00:19.141,265] <dbg> cloud: on_mqtt_puback: Publish acknowledgment received, message id: 1
[00:00:19.141,296] <dbg> mqtt_helper: mqtt_helper_poll_loop: Polling on socket fd: 0
[00:00:48.653,503] <dbg> mqtt_helper: mqtt_helper_poll_loop: Polling on socket fd: 0
[00:00:49.587,463] <dbg> mqtt_helper: mqtt_evt_handler: MQTT_EVT_PINGRESP
[00:00:49.587,493] <dbg> mqtt_helper: mqtt_helper_poll_loop: Polling on socket fd: 0
[00:01:18.697,692] <dbg> mqtt_helper: mqtt_helper_poll_loop: Polling on socket fd: 0
[00:01:19.350,921] <dbg> mqtt_helper: mqtt_evt_handler: MQTT_EVT_PINGRESP