code: def write_data(self, buf):
          
          bmRequestType = usb.util.build_request_type(
              usb.util.ENDPOINT_OUT,
              usb.util.CTRL_TYPE_CLASS,
              usb.util.CTRL_RECIPIENT_INTERFACE
              )
          result = self.dev.ctrl_transfer(
              bmRequestType=bmRequestType,
              bRequest=usb.REQ_SET_CONFIGURATION,
              data_or_wLength=buf,
              wValue=0x200,
              timeout=50)
          if result != len(buf):
              raise IOError('pywws.device_pyusb1.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