Can a non-sudo subscriber communicate with a sudo-run RouDi and publisher

[owny990312]

Issue Title: Question about process permissions: Can a non-sudo subscriber communicate with a sudo-run RouDi and publisher?

Issue Body:

Hello iceoryx team,

I have a question regarding the recommended permission model for iceoryx processes.

Scenario:

1. I start iox-roudi using sudo.
2. I start a publisher application using sudo.
3. I then try to start a subscriber application without sudo (as a regular user).

Question:

Is this mixed-permission setup (i.e., some processes running with sudo and others without) a supported and viable way for communication?

Or is it required that all communicating processes (RouDi, publishers, and subscribers) must run with consistent permissions (e.g., all as the same non-root user, or all with sudo)?

I'd appreciate any clarification on whether this is supposed to work and what the best practice is.

Thank you!

[elBoberido]

@owny990312 it's been quite some time since I looked at this part of the codebase. I think it is not possible. While one can configure the payload segments with a reader and writer group, it is not possible with the so called management data segment. This was supposed to be done at a later point in time, but meanwhile the focus has shifted to iceoryx2.