Zigbee gateway integration

[Zen]

@Zen, we are still testing Danfoss valve but from what we've seen it's not better than others. It turns out that operating mode cannot be changed - it's permanently in heating mode, so only the setpoint can be adjusted. Some improvements will be made in the next app version.

Yes, already seen it. but the setpoint, unlike wiser trvs, seems to stay. On wiser, if you do not refresh every 3 hours, it change itself. In these Danfoss it seems to not happen (at least, during the first test day)