This is partially a question about how to debug a python process that is hung.

When running the demo launch file provided by MoveIt and then trying to run this command: ros2 param list results on the ros2cli param program hanging. Does anyone know how to troubleshoot what is causing this?

I tested with RMW_IMPLEMENTATION=rmw_cyclonedds_cpp and it no longer hangs. This must be something wrong with FastDDS?