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hi @npna,

no real time scheduler right now ;) ROS uses some different mechanics for communication (Publisher/Subscriber) where often no real time is necessary.
But this one is since the beginning a hot topic and now approached with ROS2, which was released a couple of month ago.

thank you for rapid reply @befaro. i'm very busy right now. but inserted in a correct group it will be very interesting study it. For light purpose.

@npna let me know, if you have any questions about ROS :)

and you, if you have some good job. nice regards