Hello Nuki,
I am using the advanced API integration and I am subscribed to DEVICE_STATUS notification to check when a device goes offline.
To test it, I have unplugged the batteries from my Nucki Smart Lock but after some minutes I did not get any notification yet and the Nuki Web portal still shows it as connected.
How often Nuki Web check if a device is offline? There is no information in the Webhook documentation about timings.
Regards