> For the complete documentation index, see [llms.txt](https://documentation.nomos-system.com/nomos-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.nomos-system.com/nomos-system/integrator-en/skills/mqtt.md).

# MQTT

Here you can find the MQTT page within the nomos system Controller, showing the status of the built-in MQTT broker and letting you configure authentication for your own MQTT clients.

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

**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.

<figure><img src="https://2408426023-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FuO09BeiBXZAYdQbEqB20%2Fuploads%2Fgit-blob-54fa2b8fd0152bd5e3097e27434fd94ad83a7a03%2FMQTT.jpg?alt=media" alt="" width="563"><figcaption></figcaption></figure>


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