AWS IoT FleetWise will no longer be open to new customers as of April 30, 2026. Existing AWS IoT FleetWise customers can continue using the service. The [Guidance for Connected Mobility on AWS](https://aws.amazon.com/solutions/guidance/connected-mobility-on-aws/) provides guidance on how to develop and deploy modular services for connected mobility solutions that can be used to achieve equivalent capabilities as AWS IoT FleetWise.

# Monitor the last known state of your vehicles
<a name="last-known-state"></a>

**Important**  
Access to certain AWS IoT FleetWise features is currently gated. For more information, see [AWS Region and feature availability in AWS IoT FleetWise](fleetwise-regions.md).

You can monitor the last known state of your vehicles in near-real time by creating state templates and associating them with your vehicles. Vehicles associated with state templates stream telemetry data with either an `onChange` or `periodic` update strategy. With an on-change update strategy, the associated vehicles stream telemetry data when there is a change. During a periodic update strategy, the associated vehicles stream telemetry data during a specified time period.

With on-demand operations, you can request the current vehicle state at one time (fetch). You can also activate or deactivate previously deployed state templates to start or stop reporting vehicle state data. Last known state operations are performed using the AWS IoT command APIs.

Each state template contains the following information.

`name`  
The unique alias of the state template.

`signalCatalogArn`  
The Amazon Resource Name (ARN) of the signal catalog associated with the state template.

`stateTemplateProperties`  
A list of signals from which data is collected. The state template properties determine the specific signal updates the vehicle sends to the cloud.

`dataExtraDimensions`  
A list of vehicle attributes to be included in the protocol buffers (Protobuf) encoded processed data.

`metadataExtraDimensions`  
A list of vehicle attributes to be published with the processed data as an MQTT 5 user property.

`id`  
A unique, service-generated identifier.

For methods to collect data sent by a vehicle that uses the Edge Agent for AWS IoT FleetWise software, see [Process last known state vehicle data using MQTT messaging](process-last-known-state-vehicle-data.md). For more information about how to associate a state template with a vehicle, see [Create an AWS IoT FleetWise vehicle](create-vehicle.md).

**Topics**
+ [Create an AWS IoT FleetWise state template](state-templates.md)
+ [Update an AWS IoT FleetWise state template](update-state-template.md)
+ [Delete an AWS IoT FleetWise state template](delete-state-template.md)
+ [Get AWS IoT FleetWise state template information](get-state-template.md)
+ [State template operations for data collection and processing](state-template-api-operations.md)