sonoff wifi

http://randomnerdtutorials.com/reprogram-sonoff-smart-switch-with-web-server/

https://github.com/arendst/Sonoff-Tasmota/wiki/Commands

https://www.supla.org/en/download

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http://www.andremiller.net/content/programming-an-itead-sonoff-wireless-smart-switch-esp8266