aboutsummaryrefslogtreecommitdiff
path: root/src/org/traccar/protocol/Gt06ProtocolDecoder.java
blob: e6acc5e1bd2ab7619088b91e8ef20e066481c7a2 (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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
 * Copyright 2012 - 2015 Anton Tananaev (anton.tananaev@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 java.net.SocketAddress;
import java.util.Calendar;
import java.util.TimeZone;
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.Context;
import org.traccar.helper.Crc;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;

public class Gt06ProtocolDecoder extends BaseProtocolDecoder {

    private boolean forceTimeZone = false;
    private final TimeZone timeZone = TimeZone.getTimeZone("UTC");

    public Gt06ProtocolDecoder(Gt06Protocol protocol) {
        super(protocol);

        if (Context.getConfig().hasKey(getProtocolName() + ".timezone")) {
            forceTimeZone = true;
            timeZone.setRawOffset(Context.getConfig().getInteger(getProtocolName() + ".timezone") * 1000);
        }
    }

    private String readImei(ChannelBuffer buf) {
        int b = buf.readUnsignedByte();
        StringBuilder imei = new StringBuilder();
        imei.append(b & 0x0F);
        for (int i = 0; i < 7; i++) {
            b = buf.readUnsignedByte();
            imei.append((b & 0xF0) >> 4);
            imei.append(b & 0x0F);
        }
        return imei.toString();
    }

    private static final int MSG_LOGIN = 0x01;
    private static final int MSG_GPS = 0x10;
    private static final int MSG_LBS = 0x11;
    private static final int MSG_GPS_LBS_1 = 0x12;
    private static final int MSG_GPS_LBS_2 = 0x22;
    private static final int MSG_STATUS = 0x13;
    private static final int MSG_SATELLITE = 0x14;
    private static final int MSG_STRING = 0x15;
    private static final int MSG_GPS_LBS_STATUS_1 = 0x16;
    private static final int MSG_GPS_LBS_STATUS_2 = 0x26;
    private static final int MSG_GPS_LBS_STATUS_3 = 0x27;
    private static final int MSG_LBS_PHONE = 0x17;
    private static final int MSG_LBS_EXTEND = 0x18;
    private static final int MSG_LBS_STATUS = 0x19;
    private static final int MSG_GPS_PHONE = 0x1A;
    private static final int MSG_GPS_LBS_EXTEND = 0x1E;
    private static final int MSG_COMMAND_0 = 0x80;
    private static final int MSG_COMMAND_1 = 0x81;
    private static final int MSG_COMMAND_2 = 0x82;

    private static void sendResponse(Channel channel, int type, int index) {
        if (channel != null) {
            ChannelBuffer response = ChannelBuffers.directBuffer(10);
            response.writeByte(0x78); response.writeByte(0x78); // header
            response.writeByte(0x05); // size
            response.writeByte(type);
            response.writeShort(index);
            response.writeShort(Crc.crc16Ccitt(response.toByteBuffer(2, 4)));
            response.writeByte(0x0D); response.writeByte(0x0A); // ending
            channel.write(response);
        }
    }

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

        ChannelBuffer buf = (ChannelBuffer) msg;

        // Check header
        if (buf.readByte() != 0x78 || buf.readByte() != 0x78) {
            return null;
        }

        int length = buf.readUnsignedByte(); // size
        int dataLength = length - 5;

        int type = buf.readUnsignedByte();

        if (type == MSG_LOGIN) {

            String imei = readImei(buf);
            buf.readUnsignedShort(); // type

            // Timezone offset
            if (dataLength > 10) {
                int extensionBits = buf.readUnsignedShort();
                int hours = (extensionBits >> 4) / 100;
                int minutes = (extensionBits >> 4) % 100;
                int offset = (hours * 60 + minutes) * 60;
                if ((extensionBits & 0x8) != 0) {
                    offset = -offset;
                }
                if (!forceTimeZone) {
                    timeZone.setRawOffset(offset);
                }
            }

            if (identify(imei, channel)) {
                buf.skipBytes(buf.readableBytes() - 6);
                sendResponse(channel, type, buf.readUnsignedShort());
            }

        } else if (hasDeviceId() && (
                type == MSG_GPS ||
                type == MSG_GPS_LBS_1 ||
                type == MSG_GPS_LBS_2 ||
                type == MSG_GPS_LBS_STATUS_1 ||
                type == MSG_GPS_LBS_STATUS_2 ||
                type == MSG_GPS_LBS_STATUS_3 ||
                type == MSG_GPS_PHONE ||
                type == MSG_GPS_LBS_EXTEND)) {

            // Create new position
            Position position = new Position();
            position.setDeviceId(getDeviceId());
            position.setProtocol(getProtocolName());

            // Date and time
            Calendar time = Calendar.getInstance(timeZone);
            time.clear();
            time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
            time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
            time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
            time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
            time.set(Calendar.MINUTE, buf.readUnsignedByte());
            time.set(Calendar.SECOND, buf.readUnsignedByte());
            position.setTime(time.getTime());

            // GPS length and Satellites count
            int gpsLength = buf.readUnsignedByte();
            position.set(Event.KEY_SATELLITES, gpsLength & 0b0000_1111);
            gpsLength >>= 4;

            // Latitude
            double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);

            // Longitude
            double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);

            // Speed
            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));

            // Course and flags
            int union = buf.readUnsignedShort();
            position.setCourse(union & 0b0000_0011_1111_1111);
            position.setValid((union & 0b0001_0000_0000_0000) != 0);
            if ((union & 0b0000_0100_0000_0000) == 0) latitude = -latitude;
            if ((union & 0b0000_1000_0000_0000) != 0) longitude = -longitude;

            position.setLatitude(latitude);
            position.setLongitude(longitude);

            if ((union & 0b0100_0000_0000_0000) != 0) {
                position.set(Event.KEY_IGNITION, (union & 0b1000_0000_0000_0000) != 0);
            }

            buf.skipBytes(gpsLength - 12); // skip reserved

            if (type == MSG_GPS_LBS_1 || type == MSG_GPS_LBS_2 ||
                type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3) {

                int lbsLength = 0;
                if (type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3) {
                    lbsLength = buf.readUnsignedByte();
                }

                // Cell information
                position.set(Event.KEY_MCC, buf.readUnsignedShort());
                position.set(Event.KEY_MNC, buf.readUnsignedByte());
                position.set(Event.KEY_LAC, buf.readUnsignedShort());
                position.set(Event.KEY_CELL, buf.readUnsignedShort() << 8 + buf.readUnsignedByte());
                if (lbsLength > 0) {
                    buf.skipBytes(lbsLength - 9);
                }

                // Status
                if (type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3) {

                    position.set(Event.KEY_ALARM, true);

                    int flags = buf.readUnsignedByte();

                    position.set(Event.KEY_IGNITION, (flags & 0x2) != 0);
                    // TODO parse other flags

                    // Voltage
                    position.set(Event.KEY_POWER, buf.readUnsignedByte());

                    // GSM signal
                    position.set(Event.KEY_GSM, buf.readUnsignedByte());
                }
            }

            if (type == MSG_GPS_LBS_1 && buf.readableBytes() == 4 + 6) {
                position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
            }

            // Index
            if (buf.readableBytes() > 6) {
                buf.skipBytes(buf.readableBytes() - 6);
            }
            int index = buf.readUnsignedShort();
            position.set(Event.KEY_INDEX, index);
            sendResponse(channel, type, index);
            return position;
        }

        else {
            buf.skipBytes(dataLength);
            if (type != MSG_COMMAND_0 && type != MSG_COMMAND_1 && type != MSG_COMMAND_2) {
                sendResponse(channel, type, buf.readUnsignedShort());
            }
        }

        return null;
    }

}