A switched-off washer or dryer fails in the DTLS handshake, not in a
poll: `_poll_once` opens the session itself, so `_connect_session` runs
to its 12s timeout with nothing to show. The poll path treated that like
any other poll failure and ran its reconnect -- close the session, pause,
poll again -- but there is no session to close and no association for the
device to clean up, so the retry was the identical handshake five seconds
later. That cost 29s of every 30s interval, and the same again on every
setup attempt for an entry with no snapshot to load from.
`_poll_once` now records which of the two failed, and the poll path skips
the retry when the handshake is what never completed. A session that
opened and then broke still reconnects within the cycle.
The log was the half the reporters saw: an ERROR every cycle (plus a
WARNING once three "reconnects" piled up) for a state this integration is
built to sit through, which issue #269's reporter read as the integration
having failed. An outage now reports once, DEBUG for the cycles after it,
and INFO when the device answers again.
Fixes#269
Marc Billow
5ab0c9b5a8