- mqtt-publish client topic payload #!key (qos 0) retainprocedure
Publish a message on a given topic.
- topic: null terminated string of the topic to publish to.
- payload: blob or string of data to send.
- qos: integer value 0, 1 or 2 indicating the Quality of Service to be used for the message.
- retain: set to #t to make the message retained.
returns:
- mid: message id of sent message. Note that although the MQTT protocol doesn’t use message ids for messages with QoS=0, libmosquitto assigns them message ids so they can be tracked with this parameter.