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
|
/*
* Copyright 2013 - 2014 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.nio.charset.Charset;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.ServerManager;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class AtrackProtocolDecoder extends BaseProtocolDecoder {
public AtrackProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
private static final int MSG_HEARTBEAT = 0x1A;
private static final int MSG_DATA = 0x10;
private static void sendResponse(Channel channel, long rawId, int index) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(12);
response.writeShort(0xfe02);
response.writeLong(rawId);
response.writeShort(index);
channel.write(response);
}
}
private static String readString(ChannelBuffer buf) {
String result = null;
int length = 0;
while (buf.getByte(buf.readerIndex() + length) != 0) {
length += 1;
}
if (length != 0) {
result = buf.toString(buf.readerIndex(), length, Charset.defaultCharset());
buf.skipBytes(length);
}
buf.readByte();
return result;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // prefix
buf.readUnsignedShort(); // checksum
buf.readUnsignedShort(); // length
int index = buf.readUnsignedShort();
// Get device id
long deviceId;
long rawId = buf.readLong();
String id = String.valueOf(rawId);
try {
deviceId = getDataManager().getDeviceByImei(id).getId();
} catch(Exception error) {
Log.warning("Unknown device - " + id);
return null;
}
// Send acknowledgement
sendResponse(channel, rawId, index);
List<Position> positions = new LinkedList<Position>();
while (buf.readable()) {
// Create new position
Position position = new Position();
position.setDeviceId(deviceId);
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("atrack");
// Date and time
position.setTime(new Date(buf.readUnsignedInt() * 1000)); // gps time
buf.readUnsignedInt(); // rtc time
buf.readUnsignedInt(); // send time
// Coordinates
position.setValid(true);
position.setLongitude(buf.readInt() * 0.000001);
position.setLatitude(buf.readInt() * 0.000001);
position.setAltitude(0.0);
// Course
position.setCourse((double) buf.readUnsignedShort());
// Report type
extendedInfo.set("type", buf.readUnsignedByte());
// Milage
extendedInfo.set("milage", buf.readUnsignedInt() * 0.1);
// Accuracy
extendedInfo.set("hdop", buf.readUnsignedShort() * 0.1);
// Input
extendedInfo.set("input", buf.readUnsignedByte());
// Speed
position.setSpeed(buf.readUnsignedShort() * 0.539957);
// Output
extendedInfo.set("output", buf.readUnsignedByte());
// ADC
extendedInfo.set("adc", buf.readUnsignedShort() * 0.001);
// Driver
extendedInfo.set("driver", readString(buf));
// Temperature
extendedInfo.set("temperature1", buf.readShort() * 0.1);
extendedInfo.set("temperature2", buf.readShort() * 0.1);
// Text Message
extendedInfo.set("message", readString(buf));
// With AT$FORM Command you can extend atrack protocol.
// For example adding AT$FORM %FC /Fuel used you can add the line in this position:
// extendedInfo.set("fuelused", buf.readUnsignedInt() * 0.1);
position.setExtendedInfo(extendedInfo.toString());
positions.add(position);
}
return positions;
}
}
|
