Would you have any examples of how to setup tests with this?
Might be nice to create a example package (using ros_tutorials or something) that shows how this can be used.
On thing that might reduce the value of testing with netem is that the middleware in ROS 1 was never really designed for anything but ‘perfect’ networks. Performance of a node graph drops really quickly when things like lossy links are introduced, and there’s not much user-level code can do to improve that.
For ROS 2 this is definitely a nice tool.