Publish to an endpoint.
        :param str endpoint: Key by which the endpoint is recognised.
                         Subscribers will use this key to listen to events
        :param str payload: Payload to publish with the event
        :return: A boolean indicating if the publish was successful

async def publish(self, endpoint: str, payload: str):
        """
        Publish to an endpoint.
        :param str endpoint: Key by which the endpoint is recognised.
                         Subscribers will use this key to listen to events
        :param str payload: Payload to publish with the event
        :return: A boolean indicating if the publish was successful
        """
        if self._conn is not None:
            try:
                await self._conn.publish(endpoint, payload)
                return True
            except redis.Error as e:
                self._logger.error('Publish failed with error %s', repr(e))
        return False