You can set the `RCL_ASSERT_RMW_ID_MATCHES` environment variable to be sure. If it doesn't match you'll get an error like: ``` $ RCL_ASSERT_RMW_ID_MATCHES=rmw_connext_cpp RMW_IMPLEMENTATION=rmw_fastrtps_cpp ros2 run demo_nodes_cpp talker Expected RMW implementation identifier of 'rmw_connext_cpp' but instead found 'rmw_fastrtps_cpp', exiting with 102. ``` We have ideas for how to make this introspection easier for users in the future, but for the meantime I've added this info to the wiki page. --- [Visit Topic](https://discourse.ros.org/t/ros2-talker-listener-using-difffernt-dds/2124/4) 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: