Receive messages by generator. Messages returned in the generator have already been
        accepted - if you wish to add logic to accept or reject messages based on custom
        criteria, pass in a callback.

        :param on_message_received: A callback to process messages as they arrive from the
         service. It takes a single argument, a ~uamqp.message.Message object.
        :type on_message_received: callable[~uamqp.message.Message]

def receive_messages_iter(self, on_message_received=None):
        """Receive messages by generator. Messages returned in the generator have already been
        accepted - if you wish to add logic to accept or reject messages based on custom
        criteria, pass in a callback.

        :param on_message_received: A callback to process messages as they arrive from the
         service. It takes a single argument, a ~uamqp.message.Message object.
        :type on_message_received: callable[~uamqp.message.Message]
        """
        self._message_received_callback = on_message_received
        self._received_messages = compat.queue.Queue()
        return self._message_generator()