simon 6cdca4f3ad Add ESP-NOW heartbeat, client timeout, and slave reconnect.
Slaves send HEARTBEAT every 1s; the master marks clients inactive after
3s without traffic and reactivates on reconnect. CLIENT_INFO reports
last_ping as milliseconds since the last packet, not uptime.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-18 22:39:10 +02:00
2026-05-10 17:08:11 +02:00
2026-05-05 17:37:14 +02:00
2026-05-10 17:08:11 +02:00
2026-05-05 17:36:29 +02:00
2026-05-10 17:08:11 +02:00
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