code: def start_analytics_publisher(self):
      if self.analytics_publisher_process is not None:
          self.stop_analytics_publisher_process()
  
      analytics_publisher_command = (
          "python dashboard/analytics_component.py"
      )
  
      self.analytics_publisher_process = subprocess.Popen(
          shlex.split(analytics_publisher_command)
      )
  
      signal.signal(
          signal.SIGINT, self._handle_signal_analytics_publisher
      )
      signal.signal(
          signal.SIGTERM, self._handle_signal_analytics_publisher
      )
  
      atexit.register(
          self._handle_signal_analytics_publisher, 15, None, False
      )
  
imports: from serpent.utilities import SerpentError, is_windows, wait_for_crossbar
  from serpent.config import config
  import time
  import subprocess
  import shlex
  import signal
  import atexit
label_desc: Use image node_id 4 for calling the DashboardApp obj's underlying member method code with example usage: obj.start_analytics_publisher() without return types