aboutsummaryrefslogtreecommitdiff
path: root/src/main/java/org/traccar/protocol/NiotProtocolDecoder.java
blob: d53271778d8b7169fe7a698f387822fb2393bbd3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * Copyright 2020 Anton Tananaev (anton@traccar.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.traccar.protocol;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.BufferUtil;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BcdUtil;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;

public class NiotProtocolDecoder extends BaseProtocolDecoder {

    public NiotProtocolDecoder(Protocol protocol) {
        super(protocol);
    }

    public static final int MSG_RESPONSE = 0x21;
    public static final int MSG_POSITION_DATA = 0x80;

    private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int checksum) {
        if (channel != null) {
            ByteBuf response = Unpooled.buffer();
            response.writeShort(0x5858); // header
            response.writeByte(MSG_RESPONSE);
            response.writeShort(5); // length
            response.writeByte(checksum);
            response.writeByte(type);
            response.writeByte(0); // subtype
            response.writeByte(Checksum.xor(response.nioBuffer(2, response.writerIndex())));
            response.writeByte(0x0D);
            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
        }
    }

    @Override
    protected Object decode(
            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

        ByteBuf buf = (ByteBuf) msg;

        buf.skipBytes(2); // header
        int type = buf.readUnsignedByte();
        buf.readUnsignedShort(); // length

        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);

        sendResponse(channel, remoteAddress, type, buf.getByte(buf.writerIndex() - 2));

        if (type == MSG_POSITION_DATA) {

            Position position = new Position(getProtocolName());

            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
            if (deviceSession == null) {
                return null;
            }
            position.setDeviceId(deviceSession.getDeviceId());

            DateBuilder dateBuilder = new DateBuilder()
                    .setYear(BcdUtil.readInteger(buf, 2))
                    .setMonth(BcdUtil.readInteger(buf, 2))
                    .setDay(BcdUtil.readInteger(buf, 2))
                    .setHour(BcdUtil.readInteger(buf, 2))
                    .setMinute(BcdUtil.readInteger(buf, 2))
                    .setSecond(BcdUtil.readInteger(buf, 2));
            position.setTime(dateBuilder.getDate());

            position.setLatitude(BufferUtil.readSignedMagnitudeInt(buf) / 1800000.0);
            position.setLongitude(BufferUtil.readSignedMagnitudeInt(buf) / 1800000.0);
            BcdUtil.readInteger(buf, 4); // reserved
            position.setCourse(BcdUtil.readInteger(buf, 4));

            int statusX = buf.readUnsignedByte();
            position.setValid(BitUtil.check(statusX, 7));
            switch (BitUtil.between(statusX, 3, 5)) {
                case 0b10 -> position.set(Position.KEY_ALARM, Position.ALARM_POWER_CUT);
                case 0b01 -> position.set(Position.KEY_ALARM, Position.ALARM_LOW_POWER);
            }

            position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());

            int statusA = buf.readUnsignedByte();
            position.set(Position.KEY_IGNITION, !BitUtil.check(statusA, 7));
            if (!BitUtil.check(statusA, 6)) {
                position.set(Position.KEY_ALARM, Position.ALARM_OVERSPEED);
            }

            buf.readUnsignedByte(); // statusB
            buf.readUnsignedByte(); // statusC
            position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
            position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 0.1);
            position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.1);
            buf.readUnsignedByte(); // speed limit
            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
            buf.readUnsignedByte(); // sensor speed
            buf.readUnsignedByte(); // reserved
            buf.readUnsignedByte(); // reserved

            while (buf.readableBytes() > 4) {
                int extendedLength = buf.readUnsignedShort();
                int extendedType = buf.readUnsignedShort();
                switch (extendedType) {
                    case 0x0001:
                        position.set(Position.KEY_ICCID,
                                buf.readCharSequence(20, StandardCharsets.US_ASCII).toString());
                        break;
                    case 0x0002:
                        int statusD = buf.readUnsignedByte();
                        position.set(Position.KEY_ALARM, BitUtil.check(statusD, 5) ? Position.ALARM_REMOVING : null);
                        position.set(Position.KEY_ALARM, BitUtil.check(statusD, 4) ? Position.ALARM_TAMPERING : null);
                        buf.readUnsignedByte(); // run mode
                        buf.readUnsignedByte(); // reserved
                        break;
                    default:
                        buf.skipBytes(extendedLength - 2);
                        break;
                }

            }

            return position;
        }

        return null;
    }

}