For those of you that like to tinker with ESP8266 devices
https://tasmota.github.io/docs/
Tasmota is an open source firmware for ESP8266 based devices created and maintained by Theo Arends.
Everything began as Sonoff-MQTT-OTA with a commit on 25th January 2016. by Theo Arendst. Its goal was to provide ESP8266 based ITEAD Sonoff devices with MQTT and 'Over the Air' or OTA firmware.
What started as a simple way to hack a cloud bound Sonoff Basic (one of the first cheap and accessible smart home devices in the market) into a locally controlled device has grown into a fully fledged ecosystem for virtually any ESP8266 based device.