When a laptop wakes from sleep, the kernel can reset the USB device and hang
up the open port, but keep the same device file. The next write fails with
EIO, and the serial transport closes itself. The serial liveness check read
only the OS port list, so it said the link was up: no reconnect dialog
opened, and each command failed with no_event_received (issue #32).
The serial check now also reads the meshcore client's is_connected flag,
which the client clears when its transport is lost, as the BLE and TCP
checks already did.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5.5
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