---
alias: user-guide-automation-task-core-messagebus-reply
tags:
- automation tasks
description: "This task handles replying to message bus requests, complementing the listener task"
---

# Message Bus Reply

:iot-messagebus-reply-lg:

The Message Bus Reply task will reply back to a message bus message that awaits a reply. This task should be used with the `Message Bus Listener` task.

![Screenshot showing a message bus reply.](../images/messagebus_reply.png)

## Inputs

| Name     | Data Type | Description                                      |
| -------- | --------- | ------------------------------------------------ |
| Reply    | `String`  | Message to reply back to the message bus request |
| Activate | `any`     | Activates the task                               |

## Outputs

| Name    | Data Type | Description                                            |
| ------- | --------- | ------------------------------------------------------ |
| Success | `Boolean` | If there was no problem emits a true                   |
| Error   | `Error`   | Error that occurred during the processing of this task |

## Settings

| Name          | Data Type | Default | Description                                              |
| ------------- | --------- | ------- | -------------------------------------------------------- |
| Default Reply | `String`  | 10000   | Default Message to reply back to the message bus request |

## Behavior

The Message Bus Reply task will reply back to a message bus message received in its execution context.  This task should be used with the `Message Bus Listener` task.

## Remarks

There is no particular remark to be made.