/dev/mesh-radio is a udev symlink to a ttyUSB*/ttyACM* node that is also
in SERIAL_CANDIDATES, so one board was detected, probed and DTR/RTS-reset
twice per reconnect cycle (and shown twice in the UI):
- detect_serial_devices() dedupes candidates by canonical path, keeping
the stable /dev/mesh-radio name
- auto-detect fallback skips the preferred path it just probed this cycle
instead of immediately resetting the same board again
- probe_device's active-session guard compares canonical paths, so a
probe via the alias can no longer open the tty the live session holds
Together with the 2s boot-settle and stable-session backoff gate, this
takes a plugged-in CP2102/ESP32 board from up to 9 reset events per
cycle at a permanent 5s retry floor down to one probe sequence per
backoff window — enough for the radio to actually finish booting.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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