# Destinations and AWS IoT Greengrass stream manager
<a name="destinations-gg-stream-manager"></a>

AWS IoT Greengrass stream manager allows you to send data to the following AWS Cloud destinations: channels in AWS IoT Analytics, streams in Amazon Kinesis Data Streams, asset properties in AWS IoT SiteWise, or objects in Amazon Simple Storage Service (Amazon S3). For more information, see [Manage data streams on the AWS IoT Greengrass Core](https://docs.aws.amazon.com/greengrass/v2/developerguide/manage-data-streams.html) in *AWS IoT Greengrass Version 2 Developer Guide*.

**Example : Data stream message structure**  
The following example shows the required data stream message structure transmitted by the AWS IoT Greengrass stream manager.  

```
{
   "assetId": "string",
   "propertyAlias": "string",
   "propertyId": "string",
   "propertyValues": [
      {
         "quality": "string",
         "timestamp": {
            "offsetInNanos": number,
            "timeInSeconds": number
         },
         "value": {
            "booleanValue": boolean,
            "doubleValue": number,
            "integerValue": number,
            "stringValue": "string"
         }
      }
   ]
}
```

**Note**  
The data stream message must include either (`assetId` and `propertyId`) or `propertyAlias` in its structure. 

`assetId`  
(Optional) The ID of the asset to update.

`propertyAlias`  
(Optional) The alias that identifies the property, such as an OPC UA server data stream path. For example:  

```
/company/windfarm/3/turbine/7/temperature
```
For more information, see [ Manage data streams](https://docs.aws.amazon.com/iot-sitewise/latest/userguide/manage-data-streams.html) in the *AWS IoT SiteWise User Guide*.

`propertyId`  
(Optional) The ID of the asset property for this entry.

`propertyValues`  
(Required) The list of property values to upload. You can specify up to 10 `propertyValues` array elements.    
`quality`  
(Optional) The quality of the asset property value.  
 `timestamp`   
(Required) The timestamp of the asset property value.    
 `offsetInNanos`   
(Optional) The nanosecond offset from `timeInSeconds`.  
 `timeInSeconds`   
(Required) The timestamp date, in seconds, in the Unix epoch format. Fractional nanosecond data is provided by `offsetInNanos`.  
 `value`   
(Required) The value of the asset property.  
Only one of the following values can exist in the `value` field.   
 `booleanValue`   
(Optional) Asset property data of type Boolean (`true` or `false`).  
 `doubleValue`   
(Optional) Asset property data of type double (floating point number).  
 `integerValue`   
(Optional) Asset property data of type integer (whole number).  
 `stringValue`   
(Optional) Asset property data of type string (sequence of characters).