Xiaomi Purifier 3C new revision support
Xiaomi Purifier 3C now has a few revisions:

zhimi.airpurifier.mb4 (old one, fully supported)
**zhimi.airp.mb4a** (new one, partically supported - only on/off)

BUT, if you fill "model" in config manually as old one - all works!

MANY THANKS to @merdok! Hope this issue will fix soon)