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# AWS::IoT::ThingType PropagatingAttribute
<a name="aws-properties-iot-thingtype-propagatingattribute"></a>

An object that represents the connection attribute, the thing attribute, and the MQTT 5 user property key.

## Syntax
<a name="aws-properties-iot-thingtype-propagatingattribute-syntax"></a>

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

### JSON
<a name="aws-properties-iot-thingtype-propagatingattribute-syntax.json"></a>

```
{
  "[ConnectionAttribute](#cfn-iot-thingtype-propagatingattribute-connectionattribute)" : String,
  "[ThingAttribute](#cfn-iot-thingtype-propagatingattribute-thingattribute)" : String,
  "[UserPropertyKey](#cfn-iot-thingtype-propagatingattribute-userpropertykey)" : String
}
```

### YAML
<a name="aws-properties-iot-thingtype-propagatingattribute-syntax.yaml"></a>

```
  [ConnectionAttribute](#cfn-iot-thingtype-propagatingattribute-connectionattribute): String
  [ThingAttribute](#cfn-iot-thingtype-propagatingattribute-thingattribute): String
  [UserPropertyKey](#cfn-iot-thingtype-propagatingattribute-userpropertykey): String
```

## Properties
<a name="aws-properties-iot-thingtype-propagatingattribute-properties"></a>

`ConnectionAttribute`  <a name="cfn-iot-thingtype-propagatingattribute-connectionattribute"></a>
The attribute associated with the connection details.  
*Required*: No  
*Type*: String  
*Allowed values*: `iot:ClientId | iot:Thing.ThingName`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ThingAttribute`  <a name="cfn-iot-thingtype-propagatingattribute-thingattribute"></a>
The thing attribute that is propagating for MQTT 5 message enrichment.  
*Required*: No  
*Type*: String  
*Pattern*: `[a-zA-Z0-9_.,@/:#-]+`  
*Maximum*: `128`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`UserPropertyKey`  <a name="cfn-iot-thingtype-propagatingattribute-userpropertykey"></a>
The key of the MQTT 5 user property, which is a key-value pair.  
*Required*: Yes  
*Type*: String  
*Pattern*: `[a-zA-Z0-9:$.]+`  
*Maximum*: `128`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)