Launching 1KHz bagfile playback

replay_bag_1khz.launch

<?xml version="1.0"?>
<launch>
  <arg   name="play_bag"     default="true"/>
  <arg   name="uut"          default="my_node"/>
  <param name="use_sim_time" value="true"/>
  <arg   name="bag_file"     value="$(env HOME)/.ros/my_bag.bag"/>

  <node pkg="my_pkg" type="$(param uut)" name="$(param uut)_node" output="screen"/>
  <!-- NOTE: standard rosbag published clock rate of 100Hz, was too slow for my ros timer callbacks -->
  <!-- Produce a clock, using the bagfile, at 1KHz to make timer callbacks up to a KHz work! -->
  <node pkg="rosbag" type="play" name="player" args="$(arg bag_file) --clock --hz=1000" output="screen" if="$(arg play_bag)"/>
</launch>