http://arduino.esp8266.com/stable/package_esp8266com_index.json
http://drazzy.com/package_drazzy.com_index.json
https://dl.espressif.com/dl/package_esp32_index.json
https://espressif.github.io/arduino-esp32/package_esp32_index.json
https://github.com/openwch/board_manager_files/raw/main/package_ch32v_index.json
https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json
https://mcudude.github.io/MicroCore/package_MCUdude_MicroCore_index.json
https://raw.githubusercontent.com/dbuezas/lgt8fx/master/package_lgt8fx_index.json