The published packet payload mixed clocks: "timestamp" was UTC ISO 8601
with a Z suffix, but the "time" and "date" fields beside it were rendered
from a naive datetime.now(), i.e. the host's local wall clock. A consumer
reading those two off a bot in a non-UTC zone sees a skew of exactly that
zone's UTC offset and flags the observer's clock as wrong.
Local time was never the intended reading. The original script took time
and date off the firmware log line, and mctomqtt sets the device clock
from calendar.timegm(), so upstream both fields are already UTC.
All three now render one aware UTC instant, so they cannot disagree with
each other or straddle a second boundary. _utc_iso_timestamp() takes an
optional instant to make that possible; its no-arg behavior is unchanged.
agessaman
1f87707ade