It is deprecated, but we've avoided removing it to prevent unnecessary disruption between releases. I summarized a bit of the history in this GitHub comment: https://github.com/ros2/common_interfaces/issues/1#issuecomment-112621348 Ultimately, it was decided that we would remove it in ROS 2: https://github.com/ros2/common_interfaces/pull/2 However, I'm not certain whether or not we'll ever do so in ROS 1. --- [Visit Topic](https://discourse.ros.org/t/is-the-sequence-number-in-header-message-deprecated/1528/2) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: