Control the robot's wheels speed and direction from the Motor Board processor. It's different from motorsWrite() of the control board. This one drives the motors directly, while the former sends signals to the motor board. So don't mix them in usage.
The parameters can be a value between -255 to 255.
If the value is bigger than 0, the wheel turns forward. Smaller than 0, the motor turns backwards.
*speedLeft: controls the speed of left wheel.
*speedRight: controls the speed of right wheel.