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# AWS::IoTAnalytics::Pipeline Activity
<a name="aws-properties-iotanalytics-pipeline-activity"></a>

An activity that performs a transformation on a message.

## Syntax
<a name="aws-properties-iotanalytics-pipeline-activity-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-iotanalytics-pipeline-activity-syntax.json"></a>

```
{
  "[AddAttributes](#cfn-iotanalytics-pipeline-activity-addattributes)" : AddAttributes,
  "[Channel](#cfn-iotanalytics-pipeline-activity-channel)" : Channel,
  "[Datastore](#cfn-iotanalytics-pipeline-activity-datastore)" : Datastore,
  "[DeviceRegistryEnrich](#cfn-iotanalytics-pipeline-activity-deviceregistryenrich)" : DeviceRegistryEnrich,
  "[DeviceShadowEnrich](#cfn-iotanalytics-pipeline-activity-deviceshadowenrich)" : DeviceShadowEnrich,
  "[Filter](#cfn-iotanalytics-pipeline-activity-filter)" : Filter,
  "[Lambda](#cfn-iotanalytics-pipeline-activity-lambda)" : Lambda,
  "[Math](#cfn-iotanalytics-pipeline-activity-math)" : Math,
  "[RemoveAttributes](#cfn-iotanalytics-pipeline-activity-removeattributes)" : RemoveAttributes,
  "[SelectAttributes](#cfn-iotanalytics-pipeline-activity-selectattributes)" : SelectAttributes
}
```

### YAML
<a name="aws-properties-iotanalytics-pipeline-activity-syntax.yaml"></a>

```
  [AddAttributes](#cfn-iotanalytics-pipeline-activity-addattributes): 
    AddAttributes
  [Channel](#cfn-iotanalytics-pipeline-activity-channel): 
    Channel
  [Datastore](#cfn-iotanalytics-pipeline-activity-datastore): 
    Datastore
  [DeviceRegistryEnrich](#cfn-iotanalytics-pipeline-activity-deviceregistryenrich): 
    DeviceRegistryEnrich
  [DeviceShadowEnrich](#cfn-iotanalytics-pipeline-activity-deviceshadowenrich): 
    DeviceShadowEnrich
  [Filter](#cfn-iotanalytics-pipeline-activity-filter): 
    Filter
  [Lambda](#cfn-iotanalytics-pipeline-activity-lambda): 
    Lambda
  [Math](#cfn-iotanalytics-pipeline-activity-math): 
    Math
  [RemoveAttributes](#cfn-iotanalytics-pipeline-activity-removeattributes): 
    RemoveAttributes
  [SelectAttributes](#cfn-iotanalytics-pipeline-activity-selectattributes): 
    SelectAttributes
```

## Properties
<a name="aws-properties-iotanalytics-pipeline-activity-properties"></a>

`AddAttributes`  <a name="cfn-iotanalytics-pipeline-activity-addattributes"></a>
Adds other attributes based on existing attributes in the message.  
*Required*: No  
*Type*: [AddAttributes](aws-properties-iotanalytics-pipeline-addattributes.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Channel`  <a name="cfn-iotanalytics-pipeline-activity-channel"></a>
Determines the source of the messages to be processed.  
*Required*: No  
*Type*: [Channel](aws-properties-iotanalytics-pipeline-channel.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Datastore`  <a name="cfn-iotanalytics-pipeline-activity-datastore"></a>
Specifies where to store the processed message data.  
*Required*: No  
*Type*: [Datastore](aws-properties-iotanalytics-pipeline-datastore.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`DeviceRegistryEnrich`  <a name="cfn-iotanalytics-pipeline-activity-deviceregistryenrich"></a>
Adds data from the AWS IoT device registry to your message.  
*Required*: No  
*Type*: [DeviceRegistryEnrich](aws-properties-iotanalytics-pipeline-deviceregistryenrich.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`DeviceShadowEnrich`  <a name="cfn-iotanalytics-pipeline-activity-deviceshadowenrich"></a>
Adds information from the AWS IoT Device Shadows service to a message.  
*Required*: No  
*Type*: [DeviceShadowEnrich](aws-properties-iotanalytics-pipeline-deviceshadowenrich.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Filter`  <a name="cfn-iotanalytics-pipeline-activity-filter"></a>
Filters a message based on its attributes.  
*Required*: No  
*Type*: [Filter](aws-properties-iotanalytics-pipeline-filter.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Lambda`  <a name="cfn-iotanalytics-pipeline-activity-lambda"></a>
Runs a Lambda function to modify the message.  
*Required*: No  
*Type*: [Lambda](aws-properties-iotanalytics-pipeline-lambda.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Math`  <a name="cfn-iotanalytics-pipeline-activity-math"></a>
Computes an arithmetic expression using the message's attributes and adds it to the message.  
*Required*: No  
*Type*: [Math](aws-properties-iotanalytics-pipeline-math.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`RemoveAttributes`  <a name="cfn-iotanalytics-pipeline-activity-removeattributes"></a>
Removes attributes from a message.  
*Required*: No  
*Type*: [RemoveAttributes](aws-properties-iotanalytics-pipeline-removeattributes.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`SelectAttributes`  <a name="cfn-iotanalytics-pipeline-activity-selectattributes"></a>
Creates a new message using only the specified attributes from the original message.  
*Required*: No  
*Type*: [SelectAttributes](aws-properties-iotanalytics-pipeline-selectattributes.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)