Obi Socket - pauloromeira/Sonoff-Tasmota GitHub Wiki
Connection
Vcc - 3,3V
TX - RX
RX - TX
GND - GND
Additional Information
A low pulse on GPIO12 switches the relay on, a low pulse on GPIO5 switches it off.
I have solved the 'pulse issue' by setting GPIO12 to always 0 (as LED) and works fine.
More Infos can be found here: #1988.
Device Images
(images from https://github.com/martin-ger/ESP8266-WiFi-Socket)