ESP32 Board URL:
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
ESP8266 Board URL:
https://arduino.esp8266.com/stable/package_esp8266com_index.json
ESP32 Board URL:
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
ESP8266 Board URL:
https://arduino.esp8266.com/stable/package_esp8266com_index.json