There are three major pieces to the MQTTPublish configuration.
The [MQTTPublish] section
This configures the MQTT connection and any necessary WeeWX options.
enable
Whether the service is enabled or not. Valid values are true or false. The default value is true.
log_mqtt
Controls the MQTT logging. Valid values are true or false. The default value is true.
max_retries
The maximum number of times to try to reconnect. The default value is 5.
clientid
The clientid to connect with. The default value is MQTTPublish-xxxx, where xxxx is a random number between 1000 and 9999.
host
The MQTT server. The default value is localhost.
keepalive
Maximum period in seconds allowed between communications with the broker. The default value is 60.
port
The port to connect to. The default value is 1883.
protocol
The MQTT protocol to use. Valid values are MQTTv31, MQTTv311, or MQTTv5. The default value is MQTTv311.
username
The username for broker authentication. The default value is None.
password
The password for broker authentication. The default is None.