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 2014 - 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.BcdUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class KhdProtocolDecoder extends BaseProtocolDecoder {
public KhdProtocolDecoder(Protocol protocol) {
super(protocol);
}
private String readSerialNumber(ByteBuf buf) {
int b1 = buf.readUnsignedByte();
int b2 = buf.readUnsignedByte() - 0x80;
int b3 = buf.readUnsignedByte() - 0x80;
int b4 = buf.readUnsignedByte();
return String.format("%02d%02d%02d%02d", b1, b2, b3, b4);
}
public static final int MSG_LOGIN = 0xB1;
public static final int MSG_CONFIRMATION = 0x21;
public static final int MSG_ON_DEMAND = 0x81;
public static final int MSG_POSITION_UPLOAD = 0x80;
public static final int MSG_POSITION_REUPLOAD = 0x8E;
public static final int MSG_ALARM = 0x82;
public static final int MSG_ADMIN_NUMBER = 0x83;
public static final int MSG_SEND_TEXT = 0x84;
public static final int MSG_REPLY = 0x85;
public static final int MSG_SMS_ALARM_SWITCH = 0x86;
public static final int MSG_PERIPHERAL = 0xA3;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // size
if (type == MSG_LOGIN || type == MSG_ADMIN_NUMBER || type == MSG_SEND_TEXT
|| type == MSG_SMS_ALARM_SWITCH || type == MSG_POSITION_REUPLOAD) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0x29);
response.writeByte(0x29); // header
response.writeByte(MSG_CONFIRMATION);
response.writeShort(5); // size
response.writeByte(buf.getByte(buf.writerIndex() - 2));
response.writeByte(type);
response.writeByte(buf.writerIndex() > 9 ? buf.getByte(9) : 0); // 10th byte
response.writeByte(Checksum.xor(response.nioBuffer()));
response.writeByte(0x0D); // ending
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
if (type == MSG_ON_DEMAND || type == MSG_POSITION_UPLOAD || type == MSG_POSITION_REUPLOAD
|| type == MSG_ALARM || type == MSG_REPLY || type == MSG_PERIPHERAL) {
Position position = new Position(getProtocolName());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, readSerialNumber(buf));
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setYear(BcdUtil.readInteger(buf, 2))
.setMonth(BcdUtil.readInteger(buf, 2))
.setDay(BcdUtil.readInteger(buf, 2))
.setHour(BcdUtil.readInteger(buf, 2))
.setMinute(BcdUtil.readInteger(buf, 2))
.setSecond(BcdUtil.readInteger(buf, 2));
position.setTime(dateBuilder.getDate());
position.setLatitude(BcdUtil.readCoordinate(buf));
position.setLongitude(BcdUtil.readCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(BcdUtil.readInteger(buf, 4)));
position.setCourse(BcdUtil.readInteger(buf, 4));
position.setValid((buf.readUnsignedByte() & 0x80) != 0);
if (type != MSG_ALARM) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedMedium());
position.set(Position.KEY_STATUS, buf.readUnsignedInt());
position.set(Position.KEY_HDOP, buf.readUnsignedByte());
position.set(Position.KEY_VDOP, buf.readUnsignedByte());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
buf.skipBytes(5); // other location data
if (type == MSG_PERIPHERAL) {
buf.readUnsignedShort(); // data length
int dataType = buf.readUnsignedByte();
buf.readUnsignedByte(); // content length
switch (dataType) {
case 0x01:
position.set(Position.KEY_FUEL_LEVEL,
buf.readUnsignedByte() * 100 + buf.readUnsignedByte());
break;
case 0x02:
position.set(Position.PREFIX_TEMP + 1,
buf.readUnsignedByte() * 100 + buf.readUnsignedByte());
break;
default:
break;
}
}
}
return position;
}
return null;
}
}
|
