def resumeProducing(self):
        """
        C{resumeProducing} the underlying producer, if it's paused.
        """
        if not self._producerPaused:
            return
        self._producerPaused = False
        self._producer.resumeProducing()

        C{resumeProducing} the underlying producer, if it's paused.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/protocols/tls.py