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Create a file like this: example.xml and launch the node with following command: FASTRTPS_DEFAULT_PROFILES_FILE=<path/to/xml/example.xml> RMW_IMPLEMENTATION=rmw_fastrtps_cpp ros2 launch my_node file.launch

<?xml version="1.0" encoding="UTF-8" ?>
<profiles xmlns="http://www.eprosima.com/XMLSchemas/fastRTPS_Profiles">
    <transport_descriptors>
        <transport_descriptor>
            <transport_id>CustomUDPTransport</transport_id>
            <type>UDPv4</type>
            <interfaceWhiteList>
                <address>enp3s0</address>
            </interfaceWhiteList>
        </transport_descriptor>
    </transport_descriptors>
    <participant profile_name="CustomUDPTransportParticipant">
        <rtps>
            <userTransports>
                <transport_id>CustomUDPTransport</transport_id>
            </userTransports>
        </rtps>
    </participant>
</profiles>