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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* 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.ByteBufUtil;
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.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
public CalAmpProtocolDecoder(CalAmpProtocol protocol) {
super(protocol);
}
public static final int MSG_NULL = 0;
public static final int MSG_ACK = 1;
public static final int MSG_EVENT_REPORT = 2;
public static final int MSG_ID_REPORT = 3;
public static final int MSG_USER_DATA = 4;
public static final int MSG_APP_DATA = 5;
public static final int MSG_CONFIG = 6;
public static final int MSG_UNIT_REQUEST = 7;
public static final int MSG_LOCATE_REPORT = 8;
public static final int MSG_USER_DATA_ACC = 9;
public static final int MSG_MINI_EVENT_REPORT = 10;
public static final int MSG_MINI_USER_DATA = 11;
public static final int SERVICE_UNACKNOWLEDGED = 0;
public static final int SERVICE_ACKNOWLEDGED = 1;
public static final int SERVICE_RESPONSE = 2;
private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int index, int result) {
if (channel != null) {
ByteBuf response = Unpooled.buffer(10);
response.writeByte(SERVICE_RESPONSE);
response.writeByte(MSG_ACK);
response.writeShort(index);
response.writeByte(type);
response.writeByte(result);
response.writeByte(0);
response.writeMedium(0);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private Position decodePosition(DeviceSession deviceSession, int type, ByteBuf buf) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(new Date(buf.readUnsignedInt() * 1000));
if (type != MSG_MINI_EVENT_REPORT) {
buf.readUnsignedInt(); // fix time
}
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
if (type != MSG_MINI_EVENT_REPORT) {
position.setAltitude(buf.readInt() * 0.01);
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedInt()));
}
position.setCourse(buf.readShort());
if (type == MSG_MINI_EVENT_REPORT) {
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
}
if (type == MSG_MINI_EVENT_REPORT) {
position.set(Position.KEY_SATELLITES, buf.getUnsignedByte(buf.readerIndex()) & 0xf);
position.setValid((buf.readUnsignedByte() & 0x20) == 0);
} else {
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.setValid((buf.readUnsignedByte() & 0x08) == 0);
}
if (type != MSG_MINI_EVENT_REPORT) {
position.set("carrier", buf.readUnsignedShort());
position.set(Position.KEY_RSSI, buf.readShort());
}
position.set("modem", buf.readUnsignedByte());
if (type != MSG_MINI_EVENT_REPORT) {
position.set(Position.KEY_HDOP, buf.readUnsignedByte());
}
int input = buf.readUnsignedByte();
position.set(Position.KEY_INPUT, input);
position.set(Position.KEY_IGNITION, BitUtil.check(input, 0));
if (type != MSG_MINI_EVENT_REPORT) {
position.set(Position.KEY_STATUS, buf.readUnsignedByte());
}
if (type == MSG_EVENT_REPORT || type == MSG_MINI_EVENT_REPORT) {
if (type != MSG_MINI_EVENT_REPORT) {
buf.readUnsignedByte(); // event index
}
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
}
int accType = BitUtil.from(buf.getUnsignedByte(buf.readerIndex()), 6);
int accCount = BitUtil.to(buf.readUnsignedByte(), 6);
if (type != MSG_MINI_EVENT_REPORT) {
position.set("append", buf.readUnsignedByte());
}
if (accType == 1) {
buf.readUnsignedInt(); // threshold
buf.readUnsignedInt(); // mask
}
for (int i = 0; i < accCount; i++) {
if (buf.readableBytes() >= 4) {
position.set("acc" + i, buf.readUnsignedInt());
}
}
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
if (BitUtil.check(buf.getByte(buf.readerIndex()), 7)) {
int content = buf.readUnsignedByte();
if (BitUtil.check(content, 0)) {
String id = ByteBufUtil.hexDump(buf.readBytes(buf.readUnsignedByte()));
getDeviceSession(channel, remoteAddress, id);
}
if (BitUtil.check(content, 1)) {
buf.skipBytes(buf.readUnsignedByte()); // identifier type
}
if (BitUtil.check(content, 2)) {
buf.skipBytes(buf.readUnsignedByte()); // authentication
}
if (BitUtil.check(content, 3)) {
buf.skipBytes(buf.readUnsignedByte()); // routing
}
if (BitUtil.check(content, 4)) {
buf.skipBytes(buf.readUnsignedByte()); // forwarding
}
if (BitUtil.check(content, 5)) {
buf.skipBytes(buf.readUnsignedByte()); // response redirection
}
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
int service = buf.readUnsignedByte();
int type = buf.readUnsignedByte();
int index = buf.readUnsignedShort();
if (service == SERVICE_ACKNOWLEDGED) {
sendResponse(channel, remoteAddress, type, index, 0);
}
if (type == MSG_EVENT_REPORT || type == MSG_LOCATE_REPORT || type == MSG_MINI_EVENT_REPORT) {
return decodePosition(deviceSession, type, buf);
}
return null;
}
}
|
