# MQTT Subscribe

## Overview

![The MQTT Subscribe Node.](/files/wIf6A75YoaPu5VyZpKCi)

The **MQTT Subscribe** subscribes to all specified `Topics`, which [**On MQTT Topic**](/incari-studio/2022.2/toolbox/communication/mqtt/events/onmqtttopic.md) is then able to receive, based on the chosen configuration in [**Project Settings**](/incari-studio/2022.2/modules/project-settings/mqtt.md). `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/2022.2/toolbox/communication/overview.md#scopes): **Project**, **Scene**.

## Attributes

![The MQTT Subscribe Node Attributes.](/files/PPrJziO5SdayMJ5ggIpv)

| 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**](/incari-studio/2022.2/toolbox/communication/mqtt/mqttstart.md)
* [**MQTT Stop**](/incari-studio/2022.2/toolbox/communication/mqtt/mqttstop.md)
* [**MQTT Publish**](/incari-studio/2022.2/toolbox/communication/mqtt/mqttpublish.md)

## External Links

* [*An in-depth explanation of Topics*](http://www.steves-internet-guide.com/understanding-mqtt-topics/#:~:text=%20Understanding%20MQTT%20Topics%20%201%20The%20%24SYS,publish%20to%20an%20individual%20topic.%20That...%20More%20)


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