# MQTT-enabled, V3 gateways for Amazon IoT SiteWise Edge
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Amazon IoT SiteWise can use MQTT-enabled, V3 gateways, representing a significant advancement in the SiteWise Edge gateway architecture. This gateway type leverages the MQTT (Message Queuing Telemetry Transport) protocol for data communication, providing enhanced flexibility and efficiency in industrial IoT deployments.

The MQTT-enabled, V3 gateway uses MQTT for data transfer, enabling a lightweight, publish-subscribe network protocol that efficiently transports messages between devices and the cloud. You can set up various data destinations, including real-time data ingestion directly into Amazon IoT SiteWise and buffered data ingestion using Amazon S3. To enable precise data collection, you can implement path filters to subscribe to specific MQTT topics.

MQTT-enabled, V3 gateways come with a pre-configured real-time destination with filters set to "\#" (all topics), which you can customize or remove as needed. To streamline data management, only one real-time destination can exist in each gateway.

The MQTT-enabled architecture differs significantly from the Classic streams, V2 gateway. While V2 uses a stream-based approach, V3 employs MQTT, offering more configurable data destinations and filtering options. However, note that V3 does not support the data processing pack, which is available in V2.

The MQTT-enabled, V3 gateway offers several advantages: 
+ Improved scalability, due to MQTT's lightweight nature, enabling better handling of numerous devices and high-frequency data transmission.
+ Enhanced data control through path filters, enabling granular management of data collection and reducing unnecessary data transfer and processing.
+ Flexible data handling, allowing configuration between real-time processing and buffered storage based on specific needs.
+ Alignment with modern IoT communication standards, setting the stage for future enhancements and integrations.

Consider adopting the MQTT-enabled, V3 gateway for new deployments, especially when you require flexible data ingestion options and precise control over data collection.

**Note**  
For existing deployments or scenarios requiring the data processing pack, the Classic streams, V2 gateway remains a viable option.

By offering both gateway types, Amazon IoT SiteWise ensures that you can choose the solution that best fits your specific industrial IoT needs, whether you prioritize advanced MQTT capabilities or compatibility with existing systems.

## Destinations and path filters
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View the following topics to learn more about destinations and path filters in MQTT-enabled gateways:
+ [Understand Amazon IoT SiteWise Edge destinations](gw-destinations.md#source-destination)
+ [Add an Amazon IoT SiteWise Edge real-time destination](destinations-real-time.md)
+ [Add an Amazon IoT SiteWise buffered destination using Amazon S3](destinations-buffered.md)
+ [Understand path filters for Amazon IoT SiteWise Edge destinationsUnderstand path filters](gw-destinations.md#destinations-path-filters)
+ [Add path filters to Amazon IoT SiteWise Edge destinations](destinations-add-path-filters.md)
+ [Manage Amazon IoT SiteWise Edge destinations](destinations-manage.md)