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385bff04bc
The reporter's printer lost its session to a keep-alive timeout at 02:19
and did not come back until 11:24 — nine hours offline, with the web UI
open throughout.
check_staleness() was never going to catch it. Its first line is
`if self.state.connected and self.is_stale()`, so it only ever handles the
half-broken session that is still connected but has gone quiet. This
client had connected=False from 02:19:42 (the offline notification fired a
minute later), so every call returned immediately, and paho's own retry was
the only thing left watching. When that stopped making progress nothing
noticed.
Adds a sweep every 60s that rebuilds a client when all four hold: it is
disconnected, it had a working session before, it has been silent for five
minutes, and its MQTT port still answers. The port check is what keeps this
from becoming a nuisance — a switched-off printer is left to paho, so a
farm powering down overnight causes no client churn and no log spam. The
five-minute grace sits well past the 60s stale timeout and the 30s max
reconnect backoff, so a session recovering on its own is never interrupted.
The rebuild goes through force_reconnect_stale_session from async context,
which takes the hard-reset path: fresh client_id and paho's QoS 1 queue
dropped, so a project_file left unacked on the dead session cannot replay
into the new one and trip 0500_4003 (#1136). Rate-limited per printer,
cooldown cleared when the printer returns, and the sweep continues past a
client that throws rather than abandoning the rest of the farm. The log
line names how long the printer was gone and the last connect error, so a
session that dies repeatedly leaves a trail.
check_port gains a public alias in printer_diagnostic rather than having
the watchdog reach for the private name.
Also corrects the Developer Mode path added in the previous commit: the
wiki documents it under Settings > Network, not Settings > General. The
menu path is dropped from the translated string entirely, since it varies
by model and firmware and the wiki carries the detail.
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