- Add #include <USB.h> to all .cpp files (required for HWCDCSerial) - Use ESP-IDF v5.x esp_task_wdt_config_t struct instead of removed API - Remove duplicate ARDUINO_USB_MODE/CDC flags from platformio.ini (board definition already provides these)
Description
HMC472A digital RF attenuator controller — ESP32-S3 firmware with USB CDC serial and WiFi REST API
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