1  board_manager:
2    additional_urls:
3    - https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
4    - https://raw.githubusercontent.com/RAKwireless/RAKwireless-Arduino-BSP-Index/main/package_rakwireless_index.json
5    - https://github.com/HelTecAutomation/Heltec_nRF52/releases/download/1.7.0/package_heltec_nrf_index.json
6    - https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
7    # - http://unsigned.io/arduino/package_unsignedio_UnsignedBoards_index.json  # 404 - disabled