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There is no general incompatibility between Groovy and Hydro. They can transparently exchange messages.

An exception is if the specific message definition has not been changed between both distributions. But this is only the case for a very small number of messages and obviously not the case in your scenario since one direction seems to work fine.

I guess one of your machines needs a different ROS_IP / ROS_HOSTNAME to make it work. It is likely that you would have the same issue when both computers would use the same distro.