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
|
/*
* Copyright 2015 Vitaly Litvak (vitavaque@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.net.SocketAddress;
import java.util.Arrays;
import java.util.Calendar;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
import static org.traccar.protocol.AutoFon45FrameDecoder.MSG_LOCATION;
import static org.traccar.protocol.AutoFon45FrameDecoder.MSG_LOGIN;
public class AutoFon45ProtocolDecoder extends BaseProtocolDecoder {
private static double convertCoordinate(short degrees, int raw) {
double seconds = (raw >> 4 & 0xffffff) / 600000.0;
return (degrees + seconds) * ((raw & 0x0f) == 0 ? -1 : 1);
}
private static byte checksum(byte[] bytes, int offset, int len) {
byte result = 0x3B;
for (int i = offset; i < offset + len; i++) {
result += 0x56 ^ bytes[i];
result++;
result ^= 0xC5 + bytes[i];
result--;
}
return result;
}
public AutoFon45ProtocolDecoder(AutoFon45Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.getUnsignedByte(0);
if (type == MSG_LOGIN) {
byte[] bytes = new byte[19];
buf.readBytes(bytes);
String imei = ChannelBuffers.hexDump(ChannelBuffers.wrappedBuffer(bytes, 1, 16)).substring(1);
if (!identify(imei, channel)) {
return null;
}
// Send response (CRC)
if (channel != null) {
byte[] response = "resp_crc=".getBytes("US-ASCII");
response = Arrays.copyOf(response, response.length + 1);
response[response.length - 1] = checksum(bytes, 0, 18);
channel.write(ChannelBuffers.wrappedBuffer(response));
}
} else if (type == MSG_LOCATION) {
buf.readUnsignedByte();
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
short status = buf.readUnsignedByte();
position.set(Event.KEY_ALARM, (status & 0x80) != 0);
position.set(Event.KEY_BATTERY, status & 0x7F);
buf.skipBytes(2); // remaining time
position.set(Event.PREFIX_TEMP + 1, buf.readByte());
buf.skipBytes(2); // timer (interval and units)
buf.readByte(); // mode
buf.readByte(); // gprs sending interval
buf.skipBytes(6); // MCC, MNC, LAC, CID
// GPS status
int valid = buf.readUnsignedByte();
position.setValid((valid & 0xc0) != 0);
position.set(Event.KEY_SATELLITES, valid & 0x3f);
// Date and time
int timeOfDay = buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte();
int date = buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte();
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, timeOfDay / 10000);
time.set(Calendar.MINUTE, (timeOfDay - time.get(Calendar.HOUR_OF_DAY) * 10000) / 100);
time.set(Calendar.SECOND, (timeOfDay - time.get(Calendar.HOUR_OF_DAY) * 10000 - time.get(Calendar.MINUTE) * 100));
time.set(Calendar.DAY_OF_MONTH, date / 10000);
time.set(Calendar.MONTH, (date - time.get(Calendar.DAY_OF_MONTH) * 10000) / 100 - 1);
time.set(Calendar.YEAR, 2000 + (date - time.get(Calendar.DAY_OF_MONTH) * 10000 - (time.get(Calendar.MONTH) + 1) * 100));
position.setTime(time.getTime());
// Location
position.setLatitude(convertCoordinate(buf.readUnsignedByte(),
buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte()));
position.setLongitude(convertCoordinate(buf.readUnsignedByte(),
buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte()));
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedByte() << 8 | buf.readUnsignedByte());
buf.readUnsignedByte(); // checksum
return position;
}
return null;
}
}
|
