code: def write_data(self, buf):
          
          result = self.devh.controlMsg(
              usb.ENDPOINT_OUT + usb.TYPE_CLASS + usb.RECIP_INTERFACE,
              usb.REQ_SET_CONFIGURATION, buf, value=0x200, timeout=50)
          if result != len(buf):
              raise IOError('pywws.device_libusb.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