code: def mpsse_gpio(self):
          
          level_low  = chr(self._level & 0xFF)
          level_high = chr((self._level >> 8) & 0xFF)
          dir_low  = chr(self._direction & 0xFF)
          dir_high = chr((self._direction >> 8) & 0xFF)
          return str(bytearray((0x80, level_low, dir_low, 0x82, level_high, dir_high)))
docs: Return command to update the MPSSE GPIO state to the current direction
          and level.