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
|
/*
* Copyright 2016 - 2022 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 org.traccar.BaseProtocolEncoder;
import org.traccar.helper.DataConverter;
import org.traccar.model.Command;
import org.traccar.Protocol;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
public class Xexun2ProtocolEncoder extends BaseProtocolEncoder {
public Xexun2ProtocolEncoder(Protocol protocol) {
super(protocol);
}
private static ByteBuf encodeFrame(ByteBuf buf) {
int bufLength = buf.readableBytes();
if (bufLength < 5) {
return null;
}
ByteBuf result = Unpooled.buffer();
result.writeBytes(buf.readBytes(2));
while (buf.readerIndex() < bufLength - 2) {
int b = buf.readUnsignedByte();
if (b == 0xfa && buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) == 0xaf) {
buf.readUnsignedByte();
result.writeByte(0xfb);
result.writeByte(0xbf);
result.writeByte(0x01);
} else if (b == 0xfb && buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) == 0xbf) {
buf.readUnsignedByte();
result.writeByte(0xfb);
result.writeByte(0xbf);
result.writeByte(0x02);
} else {
result.writeByte(b);
}
}
result.writeBytes(buf.readBytes(2));
return result;
}
private static int checksum(byte[] data)
{
int sum = 0;
int len = data.length;
for (int j = 0; len > 1; len--) {
sum += data[j++] & 0xff;
if ((sum & 0x80000000) > 0) {
sum = (sum & 0xffff) + (sum >> 16);
}
}
if (len == 1) {
sum += data[data.length - 1] & 0xff;
}
while ((sum >> 16) > 0) {
sum = (sum & 0xffff) + sum >> 16;
}
sum = (sum == 0xffff) ? sum & 0xffff : (~sum) & 0xffff;
return sum;
}
private static ByteBuf encodeContent(String uniqueId, String content) {
ByteBuf buf = Unpooled.buffer();
byte[] message = content.getBytes();
buf.writeShort(0xFAAF);
buf.writeShort(0x0007);
buf.writeShort(0x0001);
buf.writeBytes(DataConverter.parseHex(uniqueId + "0"),0,8);
buf.writeShort(message.length);
buf.writeShort(checksum(message));
buf.writeBytes(message);
buf.writeShort(0xFAAF);
return encodeFrame(buf);
}
@Override
protected Object encodeCommand(Command command) {
String uniqueId = getUniqueId(command.getDeviceId());
switch (command.getType()) {
case Command.TYPE_CUSTOM:
return encodeContent(uniqueId, command.getString(Command.KEY_DATA));
case Command.TYPE_POSITION_PERIODIC:
return encodeContent(uniqueId, String.format("tracking_send=%1$d,%1$d", command.getInteger(Command.KEY_FREQUENCY)));
case Command.TYPE_POWER_OFF:
return encodeContent(uniqueId, "of=1");
case Command.TYPE_REBOOT_DEVICE:
return encodeContent(uniqueId, "reset");
default:
return null;
}
}
}
|
