Hi @BrannonKing,
You can change the default rmw implementation by defining the `RMW_IMPLEMENTATION` environment variable before compiling (you will need to make sure to recompile the `rmw_implementation` package for the change to take effect).
You can also change the default rmw implementation used by modifying [this file](
https://github.com/ros2/rmw/blob/master/rmw_implementation_cmake/cmake/get_default_rmw_implementation.cmake#L38).
Setting this variable before compiling only changes which rmw_implementation library will be opened by default. It still compiles all rmw implementation allowing you to select another one at runtime by setting `RMW_IMPLEMENTATION` if you want to.
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https://discourse.ros.org/t/change-the-default-dds-implementation/2813/3) or reply to this email to respond.
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