---
alias: user-guide-automation-task-core-messagebus-send
tags:
- automation tasks
description: "This task broadcasts messages to a message bus topic, potentially with a reply"
---

# Message Bus Send

:iot-messagebus-send-lg:

The Message Bus Send task will broadcast a message to a particular message bus topic.

![Screenshot showing a message bus send interface with fields for "Message" and "MessageType".](../images/messagebus_send.png)

## Inputs

| Name        | Data Type      | Description                                                                                                                                                                     |
|-------------|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| MessageType | `Notification` | Type of message bus message to send. If the message is of type `Notification` it will be a fire and forget, if it is `Request` it will expect a reply back in the alloted time. |
| Subject     | `String`       | Message bus topic to send the message to.                                                                                                                                       |
| Reply     | `any`          | Reply message to the `sendRequest`.                                                                                                                                                    |
| 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                                                                                                                                                                     |
| ----------- | --------- | -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| MessageType | `String`  | `Notification` | Type of message bus message to send. If the message is of type `Notification` it will be a fire and forget, if it is `Request` it will expect a reply back in the alloted time. |

## Behavior

The Message Bus Send task send broadcast a message to a message bus topic. It also supports sending a message and expecting a reply, when it receives the reply it will emit it as an output.

## Remarks

There is no particular remark to be made.