Thanks Chris for your reply and support.
I would say there are good new and “not too bad news”, at least there is hope 
And sorry for my stupid question… how can I check if I’m using the old dingz device. I followed your instruction, deleted the app from homey and re-installed the latest version, every firmware (I have 5 dingz installled) is latest version.
So if you have deleted the dingz app and reinstalled everything, you will automatically only have ‘new’ devices.
BDW: The migration (except for the sensor) would have been done by the dingz app itself the first time it was started. >> ‘RTFM’ 
Homey 101 > Refresh the page 
…
Finally the sequence “Uninstall dingz app – shut down and restart homey – install dingz-app” worked.
- Some change
Hi Chris
I have installed the app and could set it up. After I played around I did restarted again with a new setup (factory reset of homey) and then when installing the Dingz device I get an error “dingzSwitch error AxiosError: Request failed with status code 500” when the installation whats to show the available functions of a dingz device. The ones not yet installed in the first try are working…
I tried to restart the dingz / power off / restarted the dingzSwitch…
Currently end of my ideas… Do you may have one?
thanks and regards
Tadzio
I’m missing some info (aka RTFM)
BDW: The error (500 = Internal Server Error) isn’t coming from the app, but from the MQTT broker or the switch itself.
RTFM was done properly… As first installation was working 
looks like this is a Dingz problem, as on the DingzApp the item is also not more shown. Try no to reinstall the Dingz Controller again… But somehow I did kill them by trying to install the dingzSwitch on Homey…
But anyhow… Many thanks for your huge work on programing this app!!
Regards Tadzio
BDW: You can always reinstall the app over an existing installation without losing your configuration and flows. Only deleting it and reinstalling it is “fatal.”
Hi @ChrisG i am running a test setup with Dingz and Homey and it works well. I am now planning a full renovation of my house using Dingz.
does your Homey app also support the Dingz dDi base [dali]. If yes, do you see the max 20 devices in homey or the max 16 scenes set in Dingz for the Dali devices
do you happen to have my insights in when the Dingz Matter support will come and what the impact will be on your homey app?
Are functions for garage doors and heizungsventil now supported by your Homey app?
Thanks a lot
?