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
|
/*
* Copyright 2015 - 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.Protocol;
import org.traccar.helper.DateBuilder;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class Avl301ProtocolDecoder extends BaseProtocolDecoder {
public Avl301ProtocolDecoder(Protocol protocol) {
super(protocol);
}
private String readImei(ByteBuf 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();
}
public static final int MSG_LOGIN = 'L';
public static final int MSG_STATUS = 'H';
public static final int MSG_GPS_LBS_STATUS = '$';
private void sendResponse(Channel channel, int type) {
if (channel != null) {
ByteBuf response = Unpooled.buffer(5);
response.writeByte('$');
response.writeByte(type);
response.writeByte('#');
response.writeByte('\r'); response.writeByte('\n');
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(1); // header
int type = buf.readUnsignedByte();
buf.readUnsignedByte(); // length
if (type == MSG_LOGIN) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, readImei(buf));
if (deviceSession == null) {
sendResponse(channel, type);
}
} else if (type == MSG_STATUS) {
sendResponse(channel, type);
} else if (type == MSG_GPS_LBS_STATUS) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
int gpsLength = buf.readUnsignedByte(); // gps len and sat
position.set(Position.KEY_SATELLITES, gpsLength & 0xf);
position.set(Position.KEY_SATELLITES_VISIBLE, buf.readUnsignedByte()); // satellites
double latitude = buf.readUnsignedInt() / 600000.0;
double longitude = buf.readUnsignedInt() / 600000.0;
position.setSpeed(buf.readUnsignedByte());
int union = buf.readUnsignedShort(); // course and flags
position.setCourse(union & 0x03FF);
position.setValid((union & 0x1000) != 0);
if ((union & 0x0400) != 0) {
latitude = -latitude;
}
if ((union & 0x0800) != 0) {
longitude = -longitude;
}
position.setLatitude(latitude);
position.setLongitude(longitude);
if ((union & 0x4000) != 0) {
position.set("acc", (union & 0x8000) != 0);
}
position.setNetwork(new Network(
CellTower.fromLacCid(buf.readUnsignedShort(), buf.readUnsignedMedium())));
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
int flags = buf.readUnsignedByte();
position.set("acc", (flags & 0x2) != 0);
// parse other flags
position.set(Position.KEY_POWER, buf.readUnsignedByte());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
return position;
}
return null;
}
}
|
