ESP8266Switch is for control up to 4 switches, using NodeMCU module and ESP8266_Switch.ino sketch.
For use the module in local network only, url address in the application should be set to: http://ModuleIP/1/on (for example: http://192.168.1.123/1/on).
For control the ESP8266 module globally, the listen port must be open in the router. That can be done automatically with ESP8266_Switch_UPNP.ino sketch. The port in the sketch is set to 5000, and can be changed if needed. The url address in the application in this case should be set to: http://StaticIP:Port/1/on (for example: http://80.90.134.243:5000/1/on).