Played today with this new feature and could add a FAN RPM sensor from my AC from home assistant.
Adding a CO2 sensor was possible but always displayed “unavailable” at the remote (off course all sensors work in HASS Web interface)
And only two sensors could be selected from my countless sensors in my home assistant installation. For example no temperature sensors were visible.
Something is bugged or wrongly configured…
When I try to add more entities from home assistant it does not work. No new entities. Before I added some but not all.
Also checked with another browser and empty cache - same result. At HASS side I’m having HACS UC integration v0.17.5 running.
Thank you @MR77 Good find. I’m seeing the same as your first post above. Increasing WebSocket frame size helped a lot. I can now see my hass template sensors as well which considerably opens up more sensors to be displayed.