code: def add_service(self, name, long_name, preregistered=False, notify=True):
          
  
          if name in self.services:
              raise ArgumentError("Could not add service because the long_name is taken", long_name=long_name)
  
          serv_state = states.ServiceState(name, long_name, preregistered)
  
          service = {
              'state': serv_state,
              'heartbeat_threshold': 600
          }
  
          self.services[name] = service
  
          if notify:
              return self._notify_update(name, 'new_service', self.service_info(name))
  
          return None
docs: Add a service to the list of tracked services.
  
          Args:
              name (string): A unique short service name for the service
              long_name (string): A longer, user friendly name for the service
              preregistered (bool): Whether this service is an expected preregistered
                  service.
              notify (bool): Send notifications about this service to all clients
  
          Returns:
              awaitable: If notify is True, an awaitable for the notifications.
  
              Otherwise None.