http://arduino.esp8266.com/stable/package_esp8266com_index.json,http://dan.drown.org/stm32duino/package_STM32duino_index.json,https://dl.espressif.com/dl/package_esp32_index.json,https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json