Three new attributes:
- rssi: WiFi RSSI for indoor unit
- sensor_rssi RSSI for an attached sensor
- runstate: For me it seems to be "normal" all the time but we'll see if it changes
Require 3 consecutive failures to contact the indoor unit before marking it "Unavailable".
These changes should make things a little smoother for folks whose WiFi isn't perfect, and I'm curious to see what "runstate" turns up.