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There are pairings of QoS settings in DDS (and by extensions ROS2) that are incompatible with each other, you've found one such pair - that's why it doesn't work.
There are some tables on this page https://index.ros.org/doc/ros2/Concepts/About-Quality-of-Service-Settings/#qos-compatibilities which can help you understand those that are incompatible.
| | 2 | No.2 Revision |
There are pairings of QoS settings in DDS (and by extensions extension ROS2) that are incompatible with each other, you've found one such pair - that's why it doesn't work.
There are some tables on this page https://index.ros.org/doc/ros2/Concepts/About-Quality-of-Service-Settings/#qos-compatibilities which can help you understand those that are incompatible. incompatible.
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