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rUv
7831f29436
Bug #2 (root cause): LD2410 probe-detection matched only the 4-byte head 0xF4F3F2F1, so a floating UART at 256000 baud could phantom-detect a sensor and spawn a UART task. Now requires a full validated report frame (head + sane length + tail 0xF8F7F6F5), extracted to mmwave_detect.h and shared with a host unit test (test_mmwave_detect.c, 8 vectors) so firmware and test can't diverge. Matches the validate-before-trust approach used for MR60 in #1107. Bug #1: sendto ENOMEM used a fixed 100 ms backoff too short to drain sustained lwIP/WiFi buffer pressure, so a node could stay stuck. Now exponential (100->200->...->2000 ms per consecutive ENOMEM, reset on first successful send). Removing the phantom LD2410 task (bug #2) also removes the extra load that tipped the reporter's tier-2 node into the stuck state. Validated on ESP32-S3 QFN56 rev v0.2 (the reporter's silicon): tier-2 streams ~100 frames/s with no stuck ENOMEM and correctly reports no mmWave (no phantom). LD2410 predicate truth table proven (head-without-tail REJECTED). Could not reproduce the reporter's environment-specific floating-pin noise, so the deterministic proof is the host unit test.