mq-gateway in 6.1 is in tech preview state. You can test it out, but it still lacks some features and needs to be harden for the production use. Currently, if you assign mq-gateway profile to the container it will open port 61616, and proxy the connections to the brokers inside the fabric. There isn't much you can configure at the moment. We plan to work further on it, and allow more configuration options, so you can have different load balancing and connection sharding options. That's something that will come in the future. Please raise any issues and enhancement you would like to see in this component.