code: def update(self):
          
          if self.input_method == 'local':
              # Only refresh:
              # * if there is not other scanning thread
              # * every refresh seconds (define in the configuration file)
              if self._thread is None:
                  thread_is_running = False
              else:
                  thread_is_running = self._thread.isAlive()
              if self.timer_ports.finished() and not thread_is_running:
                  # Run ports scanner
                  self._thread = ThreadScanner(self.stats)
                  self._thread.start()
                  # Restart timer
                  if len(self.stats) > 0:
                      self.timer_ports = Timer(self.stats[0]['refresh'])
                  else:
                      self.timer_ports = Timer(0)
          else:
              # Not available in SNMP mode
              pass
  
          return self.stats
docs: Update the ports list.