LED Control through bluetooth
int firstcomma = inputString.indexOf(',');
int secondcomma = inputString.indexOf(',',firstcomma+1);
String r = inputString.substring(0,firstcomma);
String g = inputString.substring(firstcomma+1,secondcomma);
String b =  inputString.substring(secondcomma+1);
red = r.toInt();
green = g.toInt();
blue = b.toInt();
Serial.print("R");
Serial.print(red);
Serial.print("G");
Serial.print(green);
Serial.print("B");
Serial.println(blue);   


This solved my problems.