String inData = String(inDataLENTGTH); // Allocate some space for the string
You really should spend some time looking at the String class. This does not do what the comment says.
const int ROLEPin1 = 6; // isiklarin bagli oldugu pin
const int ROLEPin2 = 7; // isiklarin bagli oldugu pin
const int ROLEPin3 = 8; // isiklarin bagli oldugu pin
const int ROLEPin4 = 9; // isiklarin bagli oldugu pin
const int ROLEPin5 = 10; // isiklarin bagli oldugu pin
const int ROLEPin6 = 11; // isiklarin bagli oldugu pin
You ever heard of arrays?
Only one instance of the SoftwareSerial class can listen at a time. You are never changing the instance that is listening.
You really need a Mega.