ESP8266/65 and Sonoff devices
Examples can be found here : https://github.com/i4things/NodeAPI/tree/master/examples/ESP8266-01
example modules:
USB CH340G to Serial for ESP8266-01 : https://www.aliexpress.com/item/CH340-USB-to-ESP8266-Serial-ESP-01-ESP-01S-ESP01-ESP01S-Wireless-Wifi-Developent-Board-Module/32971337222.html?spm=a2g0s.9042311.0.0.53ce4c4d6ROjKZ
Detailed description how to upgraded your Sonoff device to a rock solid secure switch using i4things now available at : https://github.com/i4things/NodeAPI/tree/master/examples/ESP8266-01/1CH_RELAY/thing