ESP8266 Community Forum

I have added Serial.print("xxx"); in WiFi.cpp file at the beginning of begin(ssid, pswrd) function. But those changes are not getting reflected (Text is not printed when WiFi.begin() is called) in the sketch.

How can I make changes in WiFi.cpp file (My objective is to add serial.print command to WiFi.cpp file)?

Not sure if its wise to edit WiFi.cpp, you'd better use debug logging instead (whenever possible).

But to answer your question: presumably your Serial is not initialized yet (with Serial.begin()).

You are changing the wrong file. WiFi.h is probably for the Arduino WiFi shield. The file you want is named ESP8266WiFi.cpp.