# MQTT

Here you can find the MQTT configuration page within the nomos system Controller, where users can set up the MQTT broker.

1. **Status:**
   * **Broker URL:** Displays the currently configured URL of the MQTT broker (e.g., mqtt://localhost).
   * **Status:** Shows the connection status of the broker..
   * **Topic Status:** Displays the status of the assigned topics (message channels).
   * **Topic Subscriber:** Number and details of clients receiving messages from a specific topic.
   * **Topic Publisher:** Number and details of clients sending messages to a specific topic.
2. **Help:**
   * Clicking on the **help** button provides assistance with configuration or issues regarding the MQTT connection.
3. **Settings:**
   * **Broker URL:** Here you can specify the URL of the MQTT broker, such as “mqtt://localhost” or an external broker address.
   * **Port:** The default port is set to **1883**, commonly used for unencrypted MQTT connections. This can be adjusted if necessary.
   * **Authentication:** When enabled, user authentication can be configured for access to the MQTT broker.

**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).

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