code: def write_data(self, buf):
          
          if sys.version_info[0] < 3:
              str_buf = ''.join(map(chr, buf))
          else:
              str_buf = bytes(buf)
          result = self.dev.controlWrite(
              libusb1.LIBUSB_ENDPOINT_OUT | libusb1.LIBUSB_TYPE_CLASS |
              libusb1.LIBUSB_RECIPIENT_INTERFACE,
              libusb1.LIBUSB_REQUEST_SET_CONFIGURATION,
              0x200, 0, str_buf, timeout=50)
          if result != len(buf):
              raise IOError('pywws.device_libusb1.USBDevice.write_data failed')
          return True
docs: Send data to the device.
  
          If the write fails for any reason, an :obj:`IOError` exception
          is raised.
  
          :param buf: the data to send.
  
          :type buf: list(int)
  
          :return: success status.
  
          :rtype: bool