code: func (r *Room) SendRPC(ctx context.Context, msg []byte) (*protos.Response, error) {
  	ret := protos.Response{}
  	err := pitaya.RPC(ctx, "connector.connectorremote.remotefunc", &ret, &protos.RPCMsg{})
  	if err != nil {
  		return nil, pitaya.Error(err, "RPC-000")
  	}
  	return reply(200, ret.Msg), nil
  }
docs: // SendRPC sends rpc