---
alias: user-guide-automation-task-core-system-reply
tags:
- automation tasks
description: "This task sends a reply message to a message bus request, paired with a System Action Listener"
---

# Send System Action Listener

:iot-system-reply-lg:

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

![Screenshot showing a system action reply interface.](../images/send_system_action_listener.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 Send System Action Reply task will reply back to a message bus message, for this controller instance, received in its execution context. This task should be used with the `System Action Listener` task.

## Example

DEE action code to make a publish:

```csharp
UseReference("Cmf.Foundation.BusinessObjects.dll", "Cmf.Foundation.BusinessObjects");
UseReference("Cmf.Foundation.BusinessOrchestration.dll", "");
UseReference("", "Cmf.Foundation.Common.Exceptions");
UseReference("", "Cmf.Foundation.Common");
UseReference("Cmf.Navigo.BusinessObjects.dll", "Cmf.Navigo.BusinessObjects");
UseReference("Newtonsoft.Json.dll", "Newtonsoft.Json.Linq");
UseReference("%MicrosoftNetPath%Microsoft.CSharp.dll", "");
var serviceProvider = (IServiceProvider)Input["ServiceProvider"];
IResource res = serviceProvider.GetService<IResource>();
res.Name = "Anneal-104";
res.Load();
var instance = res.GetAutomationControllerInstance();
if (instance == null)
   throw new Exception("Resource not connected to any IoT instance");
else
{
   instance.Publish("HelloWorld", "Value");
}
```

DEE action code to make a request and receive a reply:

```csharp
UseReference("Cmf.Foundation.BusinessObjects.dll", "Cmf.Foundation.BusinessObjects");
UseReference("Cmf.Foundation.BusinessOrchestration.dll", "");
UseReference("", "Cmf.Foundation.Common.Exceptions");
UseReference("", "Cmf.Foundation.Common");
UseReference("Cmf.Navigo.BusinessObjects.dll", "Cmf.Navigo.BusinessObjects");
UseReference("Newtonsoft.Json.dll", "Newtonsoft.Json.Linq");
UseReference("%MicrosoftNetPath%Microsoft.CSharp.dll", "");

var serviceProvider = (IServiceProvider)Input["ServiceProvider"];
IResource res = serviceProvider.GetService<IResource>();
res.Name = "Anneal-104";
res.Load();
var instance = res.GetAutomationControllerInstance();
if (instance == null)
   throw new Exception("Resource not connected to any IoT instance");
else
{
   dynamic reply = instance.SendRequest("HelloWorld", "Request", 10000);
   throw new Exception(reply == null ? "Nothing received" : "**" + reply.reply + "**" );
}
```

## Remarks

There is no particular remark to be made.