MQTT

On the MQTT page of the nomos system Controller you see the status of the built-in MQTT broker and configure authentication for your own MQTT client.

For developers: Connection, topics and examples for your own MQTT clients are described in the developer handbook under MQTT.

1. Status:

   • Broker URL: Displays the address to point your own MQTT client at, i.e. the controller's address in the network (e.g., mqtt://192.168.0.199:1883).
   • Status: Shows the connection status of the broker.
   • Status topic: The topic on which the controller publishes its status.
   • Subscriber topic: The topic the controller subscribes to, i.e. the one your client uses to send commands to the controller.
   • Publisher topic: The topic on which the controller publishes values, i.e. the one your client subscribes to.
   • The topics are only shown while the broker is connected.

2. Help:

   • Help shows an example flow that you can import into Node-RED to understand how MQTT works.

3. Settings:

   • Authentication: Here you can configure the login your own MQTT client uses to connect to the broker. Leaving it empty allows connections without authentication.

INFO

Usage Notes:

• MQTT is a lightweight messaging protocol specifically optimized for connections with minimal data traffic and low latency. It is widely used in the Smart Home sector to exchange messages between devices.
• The MQTT broker acts as a central unit to distribute messages between clients (devices).
• The controller always uses its own built-in MQTT broker; an external broker cannot be configured.