Hi,
I don't know why I've not twigged on this before. The KE100 TRV, which I talked about before
TP-Link Kasa KE100 TRV Radiator Thermostat
now works with Matter. It's simple to enable the hub, and add the hub to Hubitat. But that's as far as I've got. Then what? I can't seem to find any way to add the actual TRV or do anything further!
Seems like it's very close to being just what I've been looking for! And one day - one day - there will be a way that the TRV can turn the boiler on!