Diagnostic proved UART protocol works (ACKs received) but CAN has zero
communication. Root cause: ESP32 connects to Orin via USB Serial/JTAG
(CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y), NOT UART0 on GPIO 43/44.
The SN65HVD230 CAN transceiver is still physically on GPIO 43/44
(original pre-bd-66hx wiring was never changed).
Fix: Put TWAI on GPIO 43/44 where the transceiver actually is.
Move unused UART0 pin config to GPIO 17/18 to avoid conflict.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
06219afe69