code: def on_rabbitmq_channel_open(self, channel):
          
          LOGGER.info('Channel %i is opened for communication with RabbitMQ',
                      channel.channel_number)
          self._set_rabbitmq_channel(channel)
          self._publish_deferred_messages()
docs: Called when the RabbitMQ accepts the channel open request.
  
          :param pika.channel.Channel channel: The channel opened with RabbitMQ