code: def _wait_for_stop():
      lp.wait_for_stop()
      logging.info("Clean termination of _wait_for_stop node")
      time.sleep(2)
  
file_path: launchpad/launchpad/examples/program_wait/launch.py
imports: import threading
  import time
  from absl import app
  from absl import logging
  import launchpad
label_desc: Use image node_id 2 for calling a global function with example usage: _wait_for_stop() without return types