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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
|
/*
* Copyright 2017 - 2018 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.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class DmtProtocolDecoder extends BaseProtocolDecoder {
public DmtProtocolDecoder(DmtProtocol protocol) {
super(protocol);
}
public static final int MSG_HELLO = 0x00;
public static final int MSG_HELLO_RESPONSE = 0x01;
public static final int MSG_DATA_RECORD = 0x04;
public static final int MSG_COMMIT = 0x05;
public static final int MSG_COMMIT_RESPONSE = 0x06;
public static final int MSG_DATA_RECORD_64 = 0x10;
public static final int MSG_CANNED_REQUEST_1 = 0x14;
public static final int MSG_CANNED_RESPONSE_1 = 0x15;
public static final int MSG_CANNED_REQUEST_2 = 0x22;
public static final int MSG_CANNED_RESPONSE_2 = 0x23;
private void sendResponse(Channel channel, int type, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer(0);
response.writeByte(0x02); response.writeByte(0x55); // header
response.writeByte(type);
response.writeShortLE(content != null ? content.readableBytes() : 0);
if (content != null) {
response.writeBytes(content);
}
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private List<Position> decodeFixed64(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() >= 64) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readByte(); // type
position.set(Position.KEY_INDEX, buf.readUnsignedIntLE());
long time = buf.readUnsignedIntLE();
position.setTime(new DateBuilder()
.setYear((int) (2000 + (time & 0x3F)))
.setMonth((int) (time >> 6) & 0xF)
.setDay((int) (time >> 10) & 0x1F)
.setHour((int) (time >> 15) & 0x1F)
.setMinute((int) (time >> 20) & 0x3F)
.setSecond((int) (time >> 26) & 0x3F)
.getDate());
position.setLongitude(buf.readIntLE() * 0.0000001);
position.setLatitude(buf.readIntLE() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShortLE()));
position.setCourse(buf.readUnsignedByte() * 2);
position.setAltitude(buf.readShortLE());
buf.readUnsignedShortLE(); // position accuracy
buf.readUnsignedByte(); // speed accuracy
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
position.setValid(BitUtil.check(buf.readByte(), 0));
position.set(Position.KEY_INPUT, buf.readUnsignedIntLE());
position.set(Position.KEY_OUTPUT, buf.readUnsignedShortLE());
for (int i = 1; i <= 5; i++) {
position.set(Position.PREFIX_ADC + i, buf.readShortLE());
}
position.set(Position.KEY_DEVICE_TEMP, buf.readByte());
buf.readShortLE(); // accelerometer x
buf.readShortLE(); // accelerometer y
buf.readShortLE(); // accelerometer z
buf.skipBytes(8); // device id
position.set(Position.KEY_PDOP, buf.readUnsignedShortLE() * 0.01);
buf.skipBytes(2); // reserved
buf.readUnsignedShortLE(); // checksum
positions.add(position);
}
return positions;
}
private List<Position> decodeStandard(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.isReadable()) {
int recordEnd = buf.readerIndex() + buf.readUnsignedShortLE();
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_INDEX, buf.readUnsignedIntLE());
position.setDeviceTime(new Date(1356998400000L + buf.readUnsignedIntLE() * 1000)); // since 1 Jan 2013
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
while (buf.readerIndex() < recordEnd) {
int fieldId = buf.readUnsignedByte();
int fieldLength = buf.readUnsignedByte();
int fieldEnd = buf.readerIndex() + (fieldLength == 255 ? buf.readUnsignedShortLE() : fieldLength);
if (fieldId == 0) {
position.setFixTime(new Date(1356998400000L + buf.readUnsignedIntLE() * 1000));
position.setLatitude(buf.readIntLE() * 0.0000001);
position.setLongitude(buf.readIntLE() * 0.0000001);
position.setAltitude(buf.readShortLE());
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedShortLE()));
buf.readUnsignedByte(); // speed accuracy
position.setCourse(buf.readUnsignedByte() * 2);
position.set(Position.KEY_PDOP, buf.readUnsignedByte() * 0.1);
position.setAccuracy(buf.readUnsignedByte());
position.setValid(buf.readUnsignedByte() != 0);
} else if (fieldId == 2) {
int input = buf.readIntLE();
int output = buf.readUnsignedShortLE();
int status = buf.readUnsignedShortLE();
position.set(Position.KEY_IGNITION, BitUtil.check(input, 0));
position.set(Position.KEY_INPUT, input);
position.set(Position.KEY_OUTPUT, output);
position.set(Position.KEY_STATUS, status);
} else if (fieldId == 6) {
while (buf.readerIndex() < fieldEnd) {
switch (buf.readUnsignedByte()) {
case 1:
position.set(Position.KEY_BATTERY, buf.readUnsignedShortLE() * 0.001);
break;
case 2:
position.set(Position.KEY_POWER, buf.readUnsignedShortLE() * 0.01);
break;
case 3:
position.set(Position.KEY_DEVICE_TEMP, buf.readShortLE() * 0.01);
break;
case 4:
position.set(Position.KEY_RSSI, buf.readUnsignedShortLE());
break;
case 5:
position.set("solarPower", buf.readUnsignedShortLE() * 0.001);
break;
default:
break;
}
}
}
buf.readerIndex(fieldEnd);
}
if (position.getFixTime() == null) {
getLastLocation(position, position.getDeviceTime());
}
positions.add(position);
}
return positions;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
int length = buf.readUnsignedShortLE();
if (type == MSG_HELLO) {
buf.readUnsignedIntLE(); // device serial number
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII));
ByteBuf response = Unpooled.buffer(0);
if (length == 51) {
response.writeByte(0); // reserved
response.writeIntLE(0); // reserved
} else {
response.writeIntLE((int) ((System.currentTimeMillis() - 1356998400000L) / 1000));
response.writeIntLE(deviceSession != null ? 0 : 1); // flags
}
sendResponse(channel, MSG_HELLO_RESPONSE, response);
} else if (type == MSG_COMMIT) {
ByteBuf response = Unpooled.buffer(0);
response.writeByte(1); // flags (success)
sendResponse(channel, MSG_COMMIT_RESPONSE, response);
} else if (type == MSG_CANNED_REQUEST_1) {
ByteBuf response = Unpooled.buffer(0);
response.writeBytes(new byte[12]);
sendResponse(channel, MSG_CANNED_RESPONSE_1, response);
} else if (type == MSG_CANNED_REQUEST_2) {
sendResponse(channel, MSG_CANNED_RESPONSE_2, null);
} else if (type == MSG_DATA_RECORD_64) {
return decodeFixed64(channel, remoteAddress, buf);
} else if (type == MSG_DATA_RECORD) {
return decodeStandard(channel, remoteAddress, buf);
}
return null;
}
}
|
