code: def get_manufacturer_string(self):
          
          self._check_device_status()
          str_p = ffi.new("wchar_t[]", 255)
          rv = hidapi.hid_get_manufacturer_string(self._device, str_p, 255)
          if rv == -1:
              raise IOError("Failed to read manufacturer string from HID "
                            "device: {0}".format(self._get_last_error_string()))
          return ffi.string(str_p)
docs: Get the Manufacturer String from the HID device.
  
          :return:    The Manufacturer String
          :rtype:     unicode