Dear Thomas (@tdl-ua),
as a general remark as you posted a question seeking for “Answers” on “ROS Discourse”.
Please read the support guidelines,
https://wiki.ros.org/Support
questions should be directed to https://answers.ros.org
not to the discussion forum.
Please also do not double post things, especially without cross references as that will potentially cause multiple people
to take time to answer your same question in the different forums without knowing that someone else has already take the time.
Thank you
Thilo