You can control 4 channel relay outputs via WiFi Network with ESP8266 WiFi Module. Vist for Full detail http://androidcontrol.blogspot.com/2016/05/esp8266-wifi-control-relay.html
Need Library Adafruit_GFX.h ( Version 1.0.2 only ) , ESP_Adafruit_SSD1306.h
Developer amphancm@gmail.com ,digital2u.net@gmail.com http://softpowergroup.net/