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rtuclient_test.go
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rtuclient_test.go
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// Copyright 2014 Quoc-Viet Nguyen. All rights reserved.
// This software may be modified and distributed under the terms
// of the BSD license. See the LICENSE file for details.
package modbus
import (
"bytes"
"reflect"
"testing"
"time"
)
func TestRTUEncoding(t *testing.T) {
encoder := rtuPackager{}
encoder.SlaveID = 0x01
pdu := ProtocolDataUnit{}
pdu.FunctionCode = 0x03
pdu.Data = []byte{0x50, 0x00, 0x00, 0x18}
adu, err := encoder.Encode(&pdu)
if err != nil {
t.Fatal(err)
}
expected := []byte{0x01, 0x03, 0x50, 0x00, 0x00, 0x18, 0x54, 0xC0}
if !bytes.Equal(expected, adu) {
t.Fatalf("adu: expected %v, actual %v", expected, adu)
}
}
func TestRTUDecoding(t *testing.T) {
decoder := rtuPackager{}
adu := []byte{0x01, 0x10, 0x8A, 0x00, 0x00, 0x03, 0xAA, 0x10}
pdu, err := decoder.Decode(adu)
if err != nil {
t.Fatal(err)
}
if pdu.FunctionCode != 16 {
t.Fatalf("Function code: expected %v, actual %v", 16, pdu.FunctionCode)
}
expected := []byte{0x8A, 0x00, 0x00, 0x03}
if !bytes.Equal(expected, pdu.Data) {
t.Fatalf("Data: expected %v, actual %v", expected, pdu.Data)
}
}
var responseLengthTests = []struct {
adu []byte
length int
}{
{[]byte{4, 1, 0, 0xA, 0, 0xD, 0xDD, 0x98}, 7},
{[]byte{4, 2, 0, 0xA, 0, 0xD, 0x99, 0x98}, 7},
{[]byte{1, 3, 0, 0, 0, 2, 0xC4, 0xB}, 9},
{[]byte{0x11, 5, 0, 0xAC, 0xFF, 0, 0x4E, 0x8B}, 8},
{[]byte{0x11, 6, 0, 1, 0, 3, 0x9A, 0x9B}, 8},
{[]byte{0x11, 0xF, 0, 0x13, 0, 0xA, 2, 0xCD, 1, 0xBF, 0xB}, 8},
{[]byte{0x11, 0x10, 0, 1, 0, 2, 4, 0, 0xA, 1, 2, 0xC6, 0xF0}, 8},
}
func TestCalculateResponseLength(t *testing.T) {
for _, input := range responseLengthTests {
output := calculateResponseLength(input.adu)
if output != input.length {
t.Errorf("Response length of %x: expected %v, actual: %v",
input.adu, input.length, output)
}
}
}
func BenchmarkRTUEncoder(b *testing.B) {
encoder := rtuPackager{
SlaveID: 10,
}
pdu := ProtocolDataUnit{
FunctionCode: 1,
Data: []byte{2, 3, 4, 5, 6, 7, 8, 9},
}
for i := 0; i < b.N; i++ {
_, err := encoder.Encode(&pdu)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkRTUDecoder(b *testing.B) {
decoder := rtuPackager{
SlaveID: 10,
}
adu := []byte{0x01, 0x10, 0x8A, 0x00, 0x00, 0x03, 0xAA, 0x10}
for i := 0; i < b.N; i++ {
_, err := decoder.Decode(adu)
if err != nil {
b.Fatal(err)
}
}
}
func Test_readIncrementally(t *testing.T) {
testcases := []struct {
description string
slaveID, functionCode byte
data []byte
want []byte
wantErr bool
expectedErr interface{}
}{
{
description: "valid response",
slaveID: 0x05,
functionCode: 0x03,
data: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
want: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
},
{
description: "2 bytes too much at the end",
slaveID: 0x05,
functionCode: 0x03,
data: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7, 0xFF, 0x98,
},
want: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
},
{
description: "2 bytes too much in front",
slaveID: 0x05,
functionCode: 0x03,
data: []byte{
0xff, 0x89,
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
want: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
},
{
description: "2 bytes too much in front and end",
slaveID: 0x05,
functionCode: 0x03,
data: []byte{
0xff, 0x89,
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
0xff, 0x89,
},
want: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
},
{
description: "three times the slaveID in front",
slaveID: 0x05,
functionCode: 0x03,
data: []byte{
0x05, 0x05,
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
0xff, 0x89,
},
want: []byte{
0x05, 0x03, 0x2c, 0x80, 0x00, 0x16, 0xc4, 0x68,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0,
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0xd7,
},
},
{
description: "not enough data",
slaveID: 0x0F,
functionCode: 0x03,
data: []byte{0x05, 0x03, 0x01},
wantErr: true,
},
{
description: "max data length", // rtuMaxSize(256) - SlaveID(1) - FunctionCode(1) - length(1) - CRC(2) = 251 (FB)
slaveID: 0x05,
functionCode: 0x03,
data: []byte{
0x05, 0x03, 0xFB,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 10
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 20
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 30
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 40
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 50
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 60
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 70
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 80
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 90
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // a0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // b0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // c0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // d0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // e0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // f0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x7e, 0xf9, 0xea,
0xd7, 0xd7, // crc (not valid but not tested)
},
want: []byte{
0x05, 0x03, 0xFB,
0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xec, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 10
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 20
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 30
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 40
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 50
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 60
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 70
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 80
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // 90
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // a0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // b0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // c0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // d0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // e0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x9b, 0x37, 0x6c, 0x42, 0xe7, 0xbc, 0x0e, 0xd0, // f0
0x7e, 0xf9, 0xea, 0xff, 0x00, 0x00, 0x04, 0x67,
0x7e, 0xf9, 0xea,
0xd7, 0xd7, // crc (not valid but not tested)
},
},
{
description: "data over buffer size",
slaveID: 0x0F,
functionCode: 0x03,
data: []byte{0x0F, 0x03, 0xFC, 0x01},
wantErr: true,
expectedErr: &InvalidLengthError{length: 0xFC},
},
{
description: "slave returns length of 0",
slaveID: 0x0F,
functionCode: 0x03,
data: []byte{0x0F, 0x03, 0x00, 0x01},
wantErr: true,
expectedErr: &InvalidLengthError{length: 0x00},
},
}
for _, tc := range testcases {
t.Run(tc.description, func(t *testing.T) {
got, err := readIncrementally(tc.slaveID, tc.functionCode, bytes.NewBuffer(tc.data), time.Now().Add(time.Second*5))
if tc.wantErr {
if err == nil {
t.Fatalf("expected error but did not get one")
} else if tc.expectedErr != nil && !reflect.DeepEqual(err, tc.expectedErr) {
t.Fatalf("expected error %#v but got %#v", tc.expectedErr, err)
}
} else {
if err != nil {
t.Fatalf("got unexpected error: %+v", err)
}
if !bytes.Equal(tc.want, got) {
t.Errorf("unexpected response: want [% x], but got [% x]", tc.want, got)
}
}
})
}
}