humble <-> jazzy communication

[KenN7]

Hi,

I'm trying to make nodes running in different docker containers talk to each other.
I'm running 3 nodes in a docker-compose setup.

One docker node is a zenoh router running ROS2 Jazzy, in network_mode: host, listening on 127.0.0.1:7447
One docker node is a talker node running ROS2 jazzy, in network_mode: host.
One docker node is a listener node running ROS2 humble, in network_mode: host.

In this setup, the nodes cannot get each other messages.

If I switch the listener node to ROS2 jazzy, it works.

Is there maybe any design reasons for this ?

Here is the debug log of the node: https://pastebin.com/xpRkH9en

[Yadunund]

Communication across distributions is not a supported workflow in ROS 2 although some middlewares might be able to handle transport between versions.

rmw_zenoh is particular is incompatible across Jazzy and Humble.