code: def download(self, id, attid): # pylint: disable=invalid-name,redefined-builtin
          
          resp = self.service.get_id(self._base(id), attid, params={'format': 'download'}, stream=True)
          b = io.BytesIO()
          stream.stream_response_to_file(resp, path=b)
          resp.close()
          b.seek(0)
          return (b, self.service.filename(resp))
docs: Download a device's attachment.
  
          :param id: Device ID as an int.
          :param attid: Attachment ID as an int.
          :rtype: tuple `(io.BytesIO, 'filename')`