Automatic off after 0.5s Use api without BT connection Server:

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To keep access to BT devices you have to enable Web Bluetooth new permissions backend and relaunch the application.
Copy this into your browser chrome://flags/#web-bluetooth-new-permissions-backend

This Doora application connects to Shelly switch device with enabled Bluetooth and calls toggle action.

Password protection is set by Shelly Settings/Authorization (currently visible only in Shelly web administration).