code: def ping(self, event):
          
  
          self.log('Client ping received:', event.data, lvl=verbose)
          response = {
              'component': 'hfos.ui.clientmanager',
              'action': 'pong',
              'data': [event.data, time() * 1000]
          }
  
          self.fire(send(event.client.uuid, response))
docs: Perform a ping to measure client <-> node latency