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The RMW Implementation used when executing a ROS2 application is chosen according to the value of the following environment variable:

echo $RMW_IMPLEMENTATION

You can set different RMW in the following way:

export RMW_IMPLEMENTATION=rmw_fastrtps_cpp
export RMW_IMPLEMENTATION=rmw_opensplice_cpp
export RMW_IMPLEMENTATION=rmw_connext_cpp

The RMW Implementation used when executing a ROS2 application is chosen according to the value of the following environment variable:

echo $RMW_IMPLEMENTATION

You can set different RMW in the following way:

export RMW_IMPLEMENTATION=rmw_fastrtps_cpp
export RMW_IMPLEMENTATION=rmw_opensplice_cpp
export RMW_IMPLEMENTATION=rmw_connext_cpp

In any case, by default it will point to Fast-RTPS DDS library (open source and always installed together with ROS2).