i am trying for long time to setup a hotspot that will work without the use of internet. Something like an info kiosk, when connected there will be a popup and the given page will open. When the device is connected to the internet, everything works fine. If there is no internet (when finished, there will be no internet) nothing works,just got an error that there is no internet available. I found older posts about using static DNS entry (sth like .*.* as name) but didnt make it work, i suppose that worked in older vers.
The config used until now is very simple, static ip in bridge, ports 2-3-4-5-wifi in bridge, hotspot in bridge, voila.