executeCommand(int command); execute a function
getFrontDistance(); return int in cm
getLeftDistance(); return int in cm
moveForward(int speed);
moveForward(unsigned long time,int speed);
turnLeft(int speed);
turnLeft(unsigned long time, int speed);
turnRight(int speed);
turnRight(unsigned long time, int speed);
moveBackward(int speed);
moveBackward(unsigned long time, int speed);
brake();
brake(unsigned long time);
startMaze(bool leftMode);
setMazeCompleted();