aws iot thing disconnect notification

Question

Thing is registered in aws iot core. When implementing iot, it is important to know that things are disconnected. How can I receive an alarm when the connection to aws iot core is lost for a thing registered in aws iot core?

Philipp Sacha · Answer

Hi,

you can either use [Last Will and Testament](https://aws.amazon.com/blogs/iot/monitor-aws-iot-connections-in-near-real-time-using-mqtt-lwt/) or use [lifecycle events](https://docs.aws.amazon.com/iot/latest/developerguide/life-cycle-events.html).

With lifecycle events you create a rule which selects messages from `$aws/events/presence/disconnected/clientId` or `$aws/events/presence/disconnected/#`. The latter topic gets all disconnect events. As rule action you can use whatever service is appropriate for you to send alarms.

Cheers,  
Philipp

jgg · Answer

[Last Will and Testament](https://aws.amazon.com/blogs/iot/monitor-aws-iot-connections-in-near-real-time-using-mqtt-lwt) is your friend here.

Regards

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