We are currently moving from OpenWire to AMQP with .NET Library amqpnetlite (https://github.com/Azure/amqpnetlite) to communicate. So far most things work fine, but we actively used and need the advisory messages in order to recognize if other clients disconnect for example.
Accessing the advisory messages through the topic is not the problem, but the body is null for the ActiveMQ.Advisory.Connection topic. There are some properties set, but no body set and I'm not able to find any important information, like the RemoveInfo. I attached a few screenshots from debugger.
To be honest, I don't know if this is the desired behavior, but I think if there are messages on the advisory topic they should be useful.
I know that a byte representation wouldn't be that useful, but you could present the information in json or xml format, like in Stomp? (https://issues.apache.org/jira/browse/AMQ-2098)