At the moment I am trying to understand whether the sequence number in the ROS header message is now deprecated. I got this message on ROS answers but cannot look at the original issue. http://answers.ros.org/question/55126/why-does-ros-overwrite-my-sequence-number/ . When looking at the spec it does not talk of it being deprecated. http://docs.ros.org/api/std_msgs/html/msg/Header.html. Is it needed?