unitree_ros_to_real/unitree_legged_real/launch/real.launch

<launch>
    <arg name="ctrl_level" default="highlevel"/>

    <node pkg="unitree_legged_real" type="ros_udp" name="node_ros_udp" output="screen" args="$(arg ctrl_level)"/>

    <param name="control_level" value="$(arg ctrl_level)"/>
</launch>