# On MQTT Topic

## Overview

![The On MQTT Topic Node.](https://1582035224-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MIspkFTPkuGkv4UgQGs-3848250649%2Fuploads%2Fgit-blob-eda13faf265bea09d1a91ff3989dbb23398e1454%2Fonmqtttopic.png?alt=media)

**On MQTT Topic** is an **Event Listener Node** that executes when it receives a `Topic`.

## Attributes

| Attribute       | Type           | Description                                        |
| --------------- | -------------- | -------------------------------------------------- |
| `Configuration` | **Drop-down**  | The connection, or signal name, that will be used. |
| `Topic`         | **User Input** | The key in the **MQTT** key/value pair.            |

## See Also

* [**On MQTT Start**](https://docs.incari.com/incari-studio/2021.3/toolbox/communication/mqtt/events/onmqttstart)
* [**On MQTT Stop**](https://docs.incari.com/incari-studio/2021.3/toolbox/communication/mqtt/events/onmqttstop)

## External Links

* [*An in-depth explanation of Topics*](http://www.steves-internet-guide.com/understanding-mqtt-topics/)