ASA-Inactive-Devices-Notifications

This repo shows how inactive devices can be detected using Azure Stream Analytics.

Test case

A Stream Analytics job handles messages from multiple devices via an Azure IoT Hub input.

If a device stops sending messages for more than five minutes, it is considered disconnected.

If it starts sending data later on, it is considered connected (again).

Test data

The follow sample data is provided:

• device 1 offers data every 1 minute for 30 minutes (starting point 1 second after full minute)
• device 2 offers data every 1 minute for 30 minutes (starting point 1 second after full minute)
• device 3 offers data every 1 minute for 30 minutes with one gap of 4:59 minutes (starting point 1 second after full minute)
• device 4 offers data every 1 minute for 30 minutes with one gap of 5:01 minutes (starting point 1 second after full minute)
• device 5 offers data every 1 minute for 30 minutes with one gap of 10:01 minutes (starting point 1 second after full minute)
• device 6 offers data every 1 minute for 30 minutes with one gap of 5:01 minutes (starting exactly on full minute)

Only devices 4, 5, and 6 should generate disconnnect and connect events.

Visual Studio Code extension

This Stream Analytics job project is developed and tested using the extension for Visual Studio Code.

Credits

This solution is inspired on the approach suggeded by Florian Eiden in this Stackoverflow question.