func reflector(t *testing.T, s *zmq.Socket, n int, wg *sync.WaitGroup) chan bool {
	s.SetRcvtimeo(time.Second)
	s.SetSndtimeo(time.Second)
	svcrouter.Barrier()
	wg.Add(1)
	c := make(chan bool)
	go func() {
		/* this is a nasty hack but is OK for a test program I guess */
		for {
			if msg, err := s.RecvMessageBytes(0); err == nil {
				svcrouter.DumpMsg(fmt.Sprintf("reflector %d", n), msg)
				if _, err := s.SendMessage(msg); err != nil {
					wg.Done()
					t.Fatal(err)
					return
				}
			}
			select {
			case <-c:
				wg.Done()
				return
			default:
			}
		}
	}()
	return c
}