The Wi-Fi/web/ESP-NOW sync approach was unviable: Wi-Fi + Bluetooth-A2DP +
the delay buffer exhausted RAM on the classic ESP32 (~20 KB free), and the
Bluetooth stack was so starved the source boards couldn't even connect to a
speaker. Confirmed on hardware: with Wi-Fi up the JBL would not connect; with
Wi-Fi removed it connects instantly (~65 KB free).
- board_source.cpp: remove Wi-Fi/ESP-NOW. Keep the I2S-reader-task + ring
delay line (now 200 ms; plenty of RAM without Wi-Fi). Adjust delay live by
ear via two capacitive-touch pads — "+" on GPIO4 (T0), "-" on GPIO27 (T7);
tap = 5 ms step, hold = ramp. Persisted to flash (debounced).
- board_sink.cpp: reverted to the simple A2DP sink + I2S master (no Wi-Fi).
- platformio.ini: drop SPEAKER_ID. Remove relay_config.h.
All three boards connect reliably with healthy heap. Touch pins read ~120
untouched; threshold 40.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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