| 16 | ) |
| 17 | |
| 18 | func TestConcurrentRead(t *testing.T) { |
| 19 | l, err := net.Listen("tcp", "localhost:0") |
| 20 | require.NoError(t, err) |
| 21 | defer l.Close() |
| 22 | |
| 23 | srv, _ := mbserver.New(&echoHandler{ |
| 24 | id: 0, |
| 25 | RequestHandler: new(mbserver.DummyHandler), |
| 26 | }) |
| 27 | require.NoError(t, srv.Start(l)) |
| 28 | defer func() { _ = srv.Stop() }() |
| 29 | |
| 30 | var wg sync.WaitGroup |
| 31 | |
| 32 | for id := 1; id <= 10; id++ { |
| 33 | wg.Go(func() { |
| 34 | // client |
| 35 | conn, err := modbus.NewConnection(t.Context(), l.Addr().String(), "", "", 0, modbus.Tcp, uint8(id)) |
| 36 | require.NoError(t, err) |
| 37 | |
| 38 | for range 50 { |
| 39 | addr := uint16(rand.Int31n(200) + 1) |
| 40 | qty := uint16(rand.Int31n(32) + 1) |
| 41 | |
| 42 | b, err := conn.ReadInputRegisters(addr, qty) |
| 43 | require.NoError(t, err) |
| 44 | |
| 45 | if err == nil { |
| 46 | for u := range qty { |
| 47 | assert.Equal(t, addr^uint16(id)^u, binary.BigEndian.Uint16(b[2*u:])) |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | time.Sleep(time.Duration(rand.Int31n(1000)) * time.Microsecond) |
| 52 | } |
| 53 | }) |
| 54 | } |
| 55 | |
| 56 | wg.Wait() |
| 57 | } |
| 58 | |
| 59 | func TestReadCoils(t *testing.T) { |
| 60 | // downstream server |