How can I assert if a ROS2 node is used with an unsupported rmw implementation?
ROS2 nodes can depend on specific rwm implementations. Envinroments can be configured to use a specific rmw implementation. But how can I assert if someone tries to run a ROS2 node in an environment which does not support this specific rmw implementation?
I don't understand the question. ROS 2 nodes may depend on a specific rmw implementation, but that's not the default case any longer, maybe you missed the "In beta 1 and earlier" which is past tense now? Maybe you could describe what you're trying to do in more detail so we know how to answer?