[quote="jwang11, post:20, topic:2015"] yes, location of message_filter make it a challenging case for migration. As you said, split it out from ros_comm and into a small repo require significant effort, so you prefer to separate a branch/fork on ros_comm, right? In new branch, I try make message_filter support both ros version with some conditional code? [/quote] I don't think this is a good path forward. Simply because significant parts of the repo would be irrelevant for ROS 2 which would make synchronizing the diverging branches more and more effort. [quote="jwang11, post:20, topic:2015"] how I handle other packages, keep them intact? [/quote] I don't have a good general recommendation for you at the moment. --- [Visit Topic](https://discourse.ros.org/t/syncronized-callbacks-in-ros2/2015/21) 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: