6.0 is buggy 
I stay with 5.14.23 for the moment
Andrea
Is there a link to that version of the binding? Is there an issue downgrading?
Sorry, it was not clear enough … I was talking about Unifi Controller release, not OH Unifi Binding
Oh no thats my bad. I wasn’t paying close enough attention. So you think the issue is with the unified controller not the binding?
What I know is the Unifi release 6.0 is definitely buggy
So perhaps they changed too many things …
The UniFi binding has not been updated to support devices running UniFi OS (Cloudkey gen2+ with new firmware), udm and udmp.
There are bugs reported on git
I have a similar problem, ever since I have upgraded to a UDM Pro, the binding connection fails and I cannot retrieve any data from unifi.
My current workaround is to use the IoBroker Unifi Adapter and update the respective items in Openhab via the Openhab Adapter in IoBroker (Rest API).
A side benefit is that the Unifi Adapter in IoBroker has much more Data points exposed to use and react on.
Maybe this helps someone…
For the original problem in this thread about client never being updated to offline, I finally took some time to analyze/understand the problem in-depth, so created a PR with a proposed fix:
Best regards,
Jacob Laursen