code: func (s *SeesawECU) OverrideDestination(args *ipc.Override, reply *int) error {
  	if args == nil {
  		return errors.New("args is nil")
  	}
  	ctx := args.Ctx
  	s.trace("OverrideDestination", ctx)
  
  	authConn, err := s.ecu.authConnect(ctx)
  	if err != nil {
  		return err
  	}
  	defer authConn.Close()
  
  	if args.Destination == nil {
  		return errors.New("destination override is nil")
  	}
  	return authConn.OverrideDestination(args.Destination)
  }
docs: // OverrideDestination requests that the specified DestinationOverride be applied.