You can use the `RMW_IMPLEMENTATION` environment variable: see https://github.com/ros2/ros2/wiki/Working-with-multiple-RMW-implementations Note, however, that this will **only** take effect if you have built the node in a workspace that supports multiple RMW implementations. The pre-built binaries only provide support for the default, `rmw_fastrtps_cpp`. --- [Visit Topic](https://discourse.ros.org/t/ros2-talker-listener-using-difffernt-dds/2124/2) 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: