Alternative mechanism for detemining if DDS SHM is available between two clients

[traverseda]

As per https://fast-dds.docs.eprosima.com/en/latest/docker/shm_docker.html

The way Fast DDS utilizes to find out whether a remote DomainParticipant is running on the same host as the local one is through a hashing of the network interfaces, which entails that two Docker container which are not sharing the same network stack will be detected as two different hosts, and therefore Fast DDS will defer to communicating through the UDP Transport instead.

Requiring containers run in network-mode host is a problem for many deployment types. I'd suggest instead reading from an environment variable, something like FAST_DDS_SHM_NAMESPACE perhaps. This would make it a lot easier to manage security context for systems that use FastDDS with docker.

[JesusPoderoso]

Hi @traverseda, thanks for your contribution.
This feature is not part of our current roadmap but we will definitely take it into account for future enhancements to the library, thanks!

If you are interested in speeding this development up for future releases, do not hesitate to contact our commercial support [email protected].

[traverseda]

We'll keep that in mind, thanks