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libwebsockets/minimal-examples-lowlevel/mqtt-client/minimal-mqtt-client/README.md

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lws minimal MQTT client

The application connects to a broker at localhost 1883 (unencrypted) or 8883 (tls)

build

 $ cmake . && make

usage

Commandline option Meaning
-d Debug verbosity in decimal, eg, -d15
-s Use tls and connect to port 8883 instead of 1883

Start mosquitto server locally

$ mosquitto

Run the example

[2020/01/31 10:40:23:7789] U: LWS minimal MQTT client unencrypted [-d<verbosity>][-s]
[2020/01/31 10:40:23:8539] N: lws_mqtt_generate_id: User space provided a client ID 'lwsMqttClient'
[2020/01/31 10:40:23:9893] N: _lws_mqtt_rx_parser: migrated nwsi 0x50febd0 to sid 1 0x5106820
[2020/01/31 10:40:23:9899] U: callback_mqtt: MQTT_CLIENT_ESTABLISHED
[2020/01/31 10:40:23:9967] U: callback_mqtt: WRITEABLE: Subscribing
[2020/01/31 10:40:24:0068] U: callback_mqtt: MQTT_SUBSCRIBED

Send something to the test client

mosquitto_pub -h 127.0.0.1 -p 1883 -t test/topic0 -m "hello"

Observe it received at the test client

[2020/01/31 10:40:27:1845] U: callback_mqtt: MQTT_CLIENT_RX
[2020/01/31 10:40:27:1870] N: 
[2020/01/31 10:40:27:1945] N: 0000: 74 65 73 74 2F 74 6F 70 69 63 30                   test/topic0     
[2020/01/31 10:40:27:1952] N: