Tee confirmed physical wiring on Waveshare ESP32-S3 board:
- GPIO 15 = CAN TX (SN65HVD230 TXD)
- GPIO 16 = CAN RX (SN65HVD230 RXD)
- GPIO 17/18 = inter-board UART to ESP32 IO
Previous configs (GPIO 2/1, 43/44) were spec assumptions that didn't
match the actual board wiring. GPIO 43/44 are internal to PCB, not
on the header where the transceiver is connected.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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