- Heartbeat: if nothing has been broadcast in MONITOR_HEARTBEAT_S (default
25s) — e.g. device offline and silent — send a non-cached keepalive frame
so a reverse proxy (NPM) doesn't drop the idle WS. New subscribers still
get the last real frame, not a heartbeat.
- Poller-skip: the 60s background poller now skips any unit with a running
monitor (MonitorManager.is_active). The monitor already polls it ~1Hz and
keeps the status cache fresh, so the background poll was redundant and just
added load/lock-contention on the device's single connection (and churn,
which matters for the cellular wedge). Trade-off: the FTP start-time sync
(only in the poller) doesn't run while a unit is actively monitored — fine,
since reports take the authoritative start time from the FTP .rnd data.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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