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
|
/*
* 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.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class Gps056ProtocolDecoder extends BaseProtocolDecoder {
public Gps056ProtocolDecoder(Gps056Protocol protocol) {
super(protocol);
}
private static void sendResponse(Channel channel, String type, String imei, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
String header = "*" + type + imei;
response.writeBytes(header.getBytes(StandardCharsets.US_ASCII));
if (content != null) {
response.writeBytes(content);
}
response.writeByte('#');
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private static double decodeCoordinate(ByteBuf buf) {
double degrees = buf.getUnsignedShort(buf.readerIndex()) / 100;
double minutes = buf.readUnsignedShort() % 100 + buf.readUnsignedShort() * 0.0001;
degrees += minutes / 60;
byte hemisphere = buf.readByte();
if (hemisphere == 'S' || hemisphere == 'W') {
degrees = -degrees;
}
return degrees;
}
private static void decodeStatus(ByteBuf buf, Position position) {
position.set(Position.KEY_INPUT, buf.readUnsignedByte());
position.set(Position.KEY_OUTPUT, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 1, buf.readShortLE() * 5.06); // mV
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.skipBytes(2); // length
String type = buf.readBytes(7).toString(StandardCharsets.US_ASCII);
String imei = buf.readBytes(15).toString(StandardCharsets.US_ASCII);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
if (type.startsWith("LOGN")) {
sendResponse(channel, "LGSA" + type.substring(4), imei,
Unpooled.copiedBuffer("1", StandardCharsets.US_ASCII));
} else if (type.startsWith("GPSL")) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setValid(true);
position.setTime(dateBuilder.getDate());
position.setLatitude(decodeCoordinate(buf));
position.setLongitude(decodeCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedShort());
decodeStatus(buf, position);
sendResponse(channel, "GPSA" + type.substring(4), imei, buf.readBytes(2));
return position;
} else if (type.startsWith("SYNC")) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
decodeStatus(buf, position);
sendResponse(channel, "SYSA" + type.substring(4), imei, null);
return position;
}
return null;
}
}
|
