Also had to rename the existing DEBUG consts to DEVMODE, so as to not
confuse the two. DEVMODE is meant for developers and cannot be enabled
on-the-fly, whereas debug mode is for users to check that the bridge is
working, MQTT messages are received etc.
Update logging is throttled to avoid spurious messages for uncoalesced
MQTT updates and motion sensors. On my network with 10 devices, an
update is logged every 1-2 minutes on average.
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.
