On Mac, node discovery fails

[ruddyscent]

Searching for nodes in a single container fails. Run demo_nodes_cpp as a talker and listener, then ros2 node list shows no node.

It fails on both Intel and M1 Macs. This happens on both foxy and humble. Creating a container on Ubuntu 22.04 amd64 with the same settings does not cause the problem.

[ruddyscent]

When running in Docker on an M1 Mac, node discovery fails.

If you do it with rmw_fastrtps_cpp, the node discovery fails without any error message.

$ ros2 node list

If you set RMW as rmw_cycloid_cpp, you will get the following error message.