> For the complete documentation index, see [llms.txt](https://awsnotes.dendron.so/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://awsnotes.dendron.so/internet-of-things-iot/aws-iot-device-management/topics/event-messages.md).

# Event messages

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## Lifecycle events

* **Note**\
  Lifecycle messages might be sent out of order. You might receive duplicate messages.
* **Note**\
  With AWS IoT Device Management fleet indexing, you can search for things, run aggregate queries, and create dynamic groups based on thing Connect/Disconnect events. For more information, see [Fleet indexing](https://docs.aws.amazon.com/iot/latest/developerguide/iot-indexing.html).
* **Note**\
  Lifecycle messages might be sent out of order. You might receive duplicate messages.