Fix M5Stack Unit C6L kiss_modem env missing USB CDC flags - #3099
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M5Stack_Unit_C6L_kiss_modem env was missing ARDUINO_USB_CDC_ON_BOOT, ARDUINO_USB_MODE, and ENABLE_USB_INTERFACE build flags, present in the companion_radio_usb env for the same board. Without these, ESP32-C6 native USB serial output goes to UART0 (unconnected on this board), making the KISS modem unresponsive over USB. Hardware-verified: M5Stack Unit C6L, KISS modem confirmed operational via /dev/ttyACM0 with openhop_repeater.
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Problem
M5Stack_Unit_C6L_kiss_modemenv did not include the USB CDC build flags present inM5Stack_Unit_C6L_companion_radio_usb:ARDUINO_USB_CDC_ON_BOOT=1ARDUINO_USB_MODE=1ENABLE_USB_INTERFACEOn ESP32-C6, native USB serial requires these flags at boot. Without them, output routes to UART0, which has no physical connector on this board, making the KISS modem unresponsive over USB.
Fix
Added the same three flags used in the companion_radio_usb env for this board.
Testing
Hardware-verified on M5Stack Unit C6L. Built with
pio run -t upload -e M5Stack_Unit_C6L_kiss_modem, confirmed device enumerates as/dev/ttyACM0, confirmed KISS modem operational via openhop_repeater.