aboutsummaryrefslogtreecommitdiff
path: root/src/org/traccar/protocol/Arnavi4ProtocolDecoder.java
blob: e2a1da29f8405da985d62c4e1b683195439e81ea (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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
/*
 * Copyright 2017 Ivan Muratov (binakot@gmail.com)
 *
 * 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.Checksum;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

import static org.traccar.protocol.Arnavi4FrameDecoder.HEADER_START_SIGN;
import static org.traccar.protocol.Arnavi4FrameDecoder.HEADER_VERSION_1;
import static org.traccar.protocol.Arnavi4FrameDecoder.HEADER_VERSION_2;
import static org.traccar.protocol.Arnavi4FrameDecoder.PACKAGE_START_SIGN;
import static org.traccar.protocol.Arnavi4FrameDecoder.PACKAGE_END_SIGN;

public class Arnavi4ProtocolDecoder extends BaseProtocolDecoder {

    private static final byte RECORD_PING = 0x00;
    private static final byte RECORD_DATA = 0x01;
    private static final byte RECORD_TEXT = 0x03;
    private static final byte RECORD_FILE = 0x04;
    private static final byte RECORD_BINARY = 0x06;

    private static final byte TAG_LATITUDE = 3;
    private static final byte TAG_LONGITUDE = 4;
    private static final byte TAG_COORD_PARAMS = 5;

    public Arnavi4ProtocolDecoder(Arnavi4Protocol protocol) {
        super(protocol);
    }

    private Position decodePosition(DeviceSession deviceSession, ChannelBuffer buf, int length, Date time) {

        final Position position = new Position();
        position.setProtocol(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());

        position.setTime(time);

        int readBytes = 0;
        while (readBytes < length) {
            short tag = buf.readUnsignedByte();
            switch (tag) {
                case TAG_LATITUDE:
                    position.setLatitude(buf.readFloat());
                    position.setValid(true);
                    break;

                case TAG_LONGITUDE:
                    position.setLongitude(buf.readFloat());
                    position.setValid(true);
                    break;

                case TAG_COORD_PARAMS:
                    position.setCourse(buf.readUnsignedByte() * 2.0);
                    position.setAltitude(buf.readUnsignedByte() * 10.0);
                    byte satellites = buf.readByte();
                    position.set(Position.KEY_SATELLITES, satellites & 0x0F + (satellites >> 4) & 0x0F); // gps + glonass
                    position.setSpeed(buf.readByte() * 1.852);
                    break;

                default:
                    buf.readBytes(4); // Skip other tags
                    break;
            }

            readBytes += 5; // 1 byte tag + 4 bytes value
        }

        return position;
    }

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

        ChannelBuffer buf = (ChannelBuffer) msg;

        byte startSign = buf.readByte();

        if (startSign == HEADER_START_SIGN) {

            byte version = buf.readByte();

            String imei = String.valueOf(buf.readLong());
            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);

            if (deviceSession != null && channel != null) {

                final ChannelBuffer response;

                if (version == HEADER_VERSION_1) {
                    response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4);
                    response.writeBytes(new byte[]{0x7B, 0x00, 0x00, 0x7D});

                } else if (version == HEADER_VERSION_2) {
                    response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 9);
                    response.writeBytes(new byte[]{0x7B, 0x04, 0x00});
                    byte[] timeBytes = ByteBuffer.allocate(4).putInt((int) (System.currentTimeMillis() / 1000)).array();
                    response.writeByte(Checksum.modulo256(timeBytes));
                    response.writeBytes(timeBytes);
                    response.writeByte(0x7D);

                } else {
                    throw new IllegalArgumentException("unsupported header version");
                }

                channel.write(response);
            }

            return null;
        }

        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
        if (deviceSession == null) {
            return null;
        }

        if (startSign == PACKAGE_START_SIGN) {

            List<Position> positions = new LinkedList<>();

            int index = buf.readUnsignedByte();

            byte recordType = buf.readByte();
            while (recordType != PACKAGE_END_SIGN) {
                switch (recordType) {
                    case RECORD_PING:
                    case RECORD_DATA:
                    case RECORD_TEXT:
                    case RECORD_FILE:
                    case RECORD_BINARY:
                        int length = buf.readUnsignedShort();
                        Date time = new Date(buf.readUnsignedInt() * 1000);

                        if (recordType == RECORD_DATA) {
                            positions.add(decodePosition(deviceSession, buf, length, time));
                        }

                        buf.readUnsignedByte(); // crc
                        break;

                    default:
                        return null; // Unsupported types of package
                }

                recordType = buf.readByte();
            }

            if (channel != null) {
                final ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4);
                response.writeBytes(new byte[]{0x7B, 0x00, (byte) index, 0x7D});
                channel.write(response);
            }

            return positions;
        }

        return null;
    }

}