Compatible with ESP-IDF v4.2 and PlatformIO with Espressif Platform v3.0.0-3.2.0.
To use the ESP-IDF directly, follow their get started guide install the ESP-IDF and export to path. To compile and upload the firmware to flash memory, use idf.py build flash from this directory in your locally cloned repository.
To use PlatformIO, from this (Factory-Firmware) directory in your locally cloned repository, use the command pio run -e core2foraws -t flash -t upload to compile and upload the firmware.