code: func (s *SubscribeToken) Result() map[string]byte {
  	s.m.RLock()
  	defer s.m.RUnlock()
  	return s.subResult
  }
docs: // Result returns a map of topics that were subscribed to along with
  // the matching return code from the broker. This is either the Qos
  // value of the subscription or an error code.