So far Z2M state updates were only boolean (the device `state` on/off),
but after introducing `brightness` values, Z2M state updates may not be
recognized/acknowledged. Unmarshalled Z2M numeric values are always
float64, but updates sent out via MQTT might not be. As a result, the
values may not directly equal and may never match.
To solve this, cast the outgoing expected value into a float64 to
compare against the received Z2M value, which is already a float64.
Devices that have not received an update since a fixed timeout (24 hrs
for now), based on its last_seen time, will be marked as "not
responding" in the Home app. With this I can identify which devices are
unreachable or dead.
Also needed to upgrade hap with the fix for brutella/hap#30, or the
entire bridge will stop working.
