docs: def _tcpdump_callback(self, line, kill_switch):
      """Callback function to handle tcpdump"""
  
      line = line.lower()
      if ("listening" in line) or ("reading" in line):
          self.started = True
      if ("no suitable device" in line):
          self.error = True
          self.kill_switch()
      if "by kernel" in line:
          self.stopped = True