How to check if a device is still online in any Homey network

[Peter_Kawa]

I made this flow for these kind of issues.
You can import and use it:

The Flow Exchange(r) - Exchange Your Flows with Others!

Sensor (or any device) Connection Check. Sometimes, you’ll discover a sensor or other device doesn’t report it’s status or value anymore, but it does NOT notify you of being offline… Well, this flow checks the, most recent update time of your sensors. You can run the flow every day, twice a day, just add or remove a time triggercard. The ‘inactive time’ can be edited as well (24hrs as default) and you can choose to not send notifications when all sensors did report inside the ‘inactive time…

Install Device Capabilities app
Go to app config
Hit ‘Templates’
Hit “(Updated) Sensors Connection Check.”

For further howto: hit “How to import an Exchanger file”