code: def is_runnnig(self):
          
          resp = None
          try:
              resp = requests.get("http://%s:%s" %(self._ip, self._port))
  
              if resp.status_code == 200:
                  return True
              else:
                  return False
          except:
              return False
docs: Determine whether hub server is running
          :return:True or False