Arduino Bluetooth Controller

The app is for users who have built the remote controlled bluetooth enabled Arduino toy car but need to control it over bluetooth from their mobile device. The controls and how-to are listed in here.
http://robust-tech.blogspot.com/2016/02/arduino-remote-car-app.html

In short below is the code snippet for arduino

if (receivedChar == '1') { forward(); flag = 6; }

the code mapping is as below

Forward --> 1Back --> 2Right --> 3Left --> 4Stop --> 5Auto Pilot --> 8Fn1 --> 6Fn2 --> 7Fn3 --> 9