catkin_ws/src/ros_test_pkg/launch/start_turtle.launch

<launch>
    <node pkg="turtlesim" type="turtlesim_node" name="turtlesim_node" output="screen" />

    <node pkg="ros_test_pkg" type="turtlesim_control_node" name="contorl_node" output="screen">
      <rosparam file="$(find ros_test_pkg)/cfg/config.yaml" command="load" />
    </node>

    <node pkg="rqt_reconfigure" type="rqt_reconfigure" name="rqt_reconfigure" output="screen" />
</launch>