MQTT

The MQTT tab configures the connection to an MQTT broker and the device-related MQTT topics.

General

Setting	Meaning
Enabled	Enables or disables the MQTT client
Topic prefix	Shared prefix for device-related topics
Client ID	Unique MQTT client ID
Connection status	Current state of the broker connection

Broker

Setting	Meaning
Host	Address of the MQTT broker
Port	Broker port, typically 1883 without TLS or 8883 with TLS
Keep-alive interval	Interval used to monitor the broker connection
Start with clean session	Starts the MQTT session without an existing session state
Use TLS	Enables an encrypted connection
Skip certificate validation	Skips validation of the broker certificate
Root certificate	Trusted CA certificate used to validate the broker
Use authentication	Enables login using a username and password
Use client certificate	Enables certificate-based client authentication
Client certificate and client key	Key material used for client authentication

Device topics

Device topics represent automatically created device-related messages, such as keep-alive and status information. The table shows the number, topic, and description. Complete topics are formed from the topic prefix and the relevant device path.

Datapoint values can additionally be published or written directly over MQTT using the configuration of each datapoint.

For simple value integration, prefer the MQTT functions provided by datapoints. Custom MQTT publishing in JavaScript is suitable for project-specific additional messages.