code: function exit()
  {
  	if (my_MotorDriver_obj)
  	{
  		my_MotorDriver_obj = null;
  		MotorDriver_lib.cleanUp();
  	}
  	MotorDriver_lib = null;
  	console.log("Exiting");
  	process.exit(0);	
  }
docs: When exiting: clear memory and print exit message