Thanks Peter!
Yes, I tried both — the official Reolink integration in Home Assistant and the ONVIF app in Homey.
The Reolink one works straight away, detects the Home Hub,Chime and the WiFi Doorbell instantly.
The ONVIF app in Homey always gives the same “invalid protocol” error.
From what I’ve learned (thanks to ChatGPT and a lot of testing 
), the Hub identifies itself as an ONVIF device but doesn’t actually expose the required RTSP/ONVIF endpoints.
So it looks compatible, but it’s really locked to Reolink’s own API.
Maybe they’ll open it up in a future firmware, but for now HA’s Reolink integration is the only one that truly works.
PS:
I’m sending the “doorbell press” and “motion” entities from HA to Homey via MQTT, because it’s a lot faster than using the HA app in Homey.
The MQTT triggers are instant, while the HA app adds a small delay.
Also noticed that generating live-view or snapshot links from the Hub is quite tricky.
the URLs are token-based and require authentication, so they can’t easily be used in Homey or external dashboards.
That’s another reason why I rely on HA to handle the camera feed instead of trying to pull it directly from the Hub.
So for now I’ll stick with HA + MQTT to Homey — works like a charm 
