Sonoff RF Bridge 433 + Digoo DG-R8H 433MHz

So I make the hardware modification on the Sonoff RF Bridge (mine is R2 V1) :

I downloaded the OpenMQTTGateway_sources and the rfbridge-libraries
and I put all 2 in the ArduinoIde “libraries” folder
I uncoment "#define ZgatewayPilight “Pilight” and I change the pin’s in the config_RF.h
RF_RECEIVER_GPIO 4 and RF_EMITTER_GPIO 5

Now I don’t know witch board I must choose from Tools menu cause if I try to compile it give me the error:

Board generic (platform esp8266, package esp8266) is unknown
Error compiling for board Generic ESP8266 Module.

Thanks a lot for the help
Denis