Confirmed on real hardware: a genuine Heltec V4 RNode (firmware 1.86,
verified via rnodeconf --info against the same port) prints extra
boot/status chatter over the same serial line before answering KISS
commands. Replaying the exact probe bytes and timing budget our Rust
probe_rnode() uses showed DETECT_RESP arriving ~1.05s after the write —
past the old 800ms deadline, so a real, correctly-flashed, correctly-
responding RNode was being timed out and misclassified as "not an RNode".
2.5s leaves comfortable margin. Non-RNode devices (Meshcore/Meshtastic)
already budget ~5s each, so this doesn't meaningfully slow down detection
when the port turns out to be something else.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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