nuttx-apps/examples/mqttc/README.md

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This is a simple MQTT publisher example using MQTT-C
By default it publishes to the "test" topic and exits. Default behaviour
including, host, port, topic, message and loop count can be changed through
different arguments.
To test:
From the host start an MQTT broker and subscribe to the "test" topic. Here
mosquitto is used:
```
mosquitto&
mosquitto_sub -t test
```
Make sure that mosquitto is configured in local mode only.
From the nsh:
Launch the built-in app `mqttc_pub` specifying the host:
```
mqttc_pub -h HOST
```
The target will publish the message "test".