code: func (ns *NatsRPCClient) BroadcastSessionBind(uid string) error {
  	msg := &protos.BindMsg{
  		Uid: uid,
  		Fid: ns.server.ID,
  	}
  	msgData, err := proto.Marshal(msg)
  	if err != nil {
  		return err
  	}
  	return ns.Send(GetBindBroadcastTopic(ns.server.Type), msgData)
  }
docs: // BroadcastSessionBind sends the binding information to other servers that may br interested in this info