# MQTT Subscribe

## Overview

![The MQTT Subscribe Node.](https://2628349686-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fwnv17cpjDin2deSlOz0z%2Fuploads%2Fgit-blob-d12d75826b236c852ae30da6237583ed1924ea7c%2Fmqttsubscribeupdatedimage.png?alt=media)

The **MQTT Subscribe** subscribes to all specified `Topics`, which [**On MQTT Topic**](https://docs.incari.com/incari-studio/2023.1/toolbox/communication/mqtt/events/onmqtttopic) is then able to receive, based on the chosen configuration in [**Project Settings**](https://docs.incari.com/incari-studio/2023.1/modules/project-settings/mqtt). `Topics` are *strings* that act as filters for *Messages* and are hierarchical, meaning there are different levels. Remember, they are case sensitive.

[**Scope**](https://github.com/cgi-studio-gmbh/incari-doc/blob/2023.1/toolbox/communication/overview.md#scopes): **Project**, **Scene**.

## Attributes

![The MQTT Subscribe Node Attributes.](https://2628349686-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fwnv17cpjDin2deSlOz0z%2Fuploads%2Fgit-blob-8a6b8ab89fd573eacfea92167a7170545e4779c2%2Fmqttsubscribeattributes2.png?alt=media)

| 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, in the form *Topic/name*. |

## Inputs

| Input             | Type      | Description                                                           |
| ----------------- | --------- | --------------------------------------------------------------------- |
| *Pulse Input* (►) | **Pulse** | A standard **Input Pulse**, to trigger the execution of the **Node**. |

## Outputs

| Output             | Type      | Description                                                                                                                            |
| ------------------ | --------- | -------------------------------------------------------------------------------------------------------------------------------------- |
| *Pulse Output* (►) | **Pulse** | A standard **Output Pulse**, to move onto the next **Node** along the **Logic Branch**, once this **Node** has finished its execution. |

## See Also

* [**MQTT Start**](https://docs.incari.com/incari-studio/2023.1/toolbox/communication/mqtt/mqttstart)
* [**MQTT Stop**](https://docs.incari.com/incari-studio/2023.1/toolbox/communication/mqtt/mqttstop)
* [**MQTT Publish**](https://docs.incari.com/incari-studio/2023.1/toolbox/communication/mqtt/mqttpublish)

## External Links

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