This issue tracks several PRs aimed at switching the RMW implementation for RTI Connext DDS included in the ROS2 source tree from the one provided by ros2/rmw_connext (rmw_connext_cpp) to the one provided by rticommunity/rmw_connextdds (rmw_connextdds) in preparation for the ROS2 Galactic release.
This ros2.repos can be used to build the source tree using forks of all affected repositories.