aboutsummaryrefslogtreecommitdiff
path: root/src/main/java/org/traccar/protocol/NvsProtocolDecoder.java
blob: f826c412120867138af0c167923320cf558a6fed (plain)
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
/*
 * Copyright 2016 - 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;

import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

public class NvsProtocolDecoder extends BaseProtocolDecoder {

    public NvsProtocolDecoder(Protocol protocol) {
        super(protocol);
    }

    private void sendResponse(Channel channel, SocketAddress remoteAddress, String response) {
        if (channel != null) {
            channel.writeAndFlush(new NetworkMessage(
                    Unpooled.copiedBuffer(response, StandardCharsets.US_ASCII), remoteAddress));
        }
    }

    @Override
    protected Object decode(
            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

        ByteBuf buf = (ByteBuf) msg;


        if (buf.getUnsignedByte(buf.readerIndex()) == 0) {

            buf.readUnsignedShort(); // length

            String imei = buf.toString(buf.readerIndex(), 15, StandardCharsets.US_ASCII);

            if (getDeviceSession(channel, remoteAddress, imei) != null) {
                sendResponse(channel, remoteAddress, "OK");
            } else {
                sendResponse(channel, remoteAddress, "NO01");
            }

        } else {

            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
            if (deviceSession == null) {
                return null;
            }

            List<Position> positions = new LinkedList<>();

            buf.skipBytes(4); // marker
            buf.readUnsignedShort(); // length
            buf.readLong(); // imei
            buf.readUnsignedByte(); // codec
            int count = buf.readUnsignedByte();

            for (int i = 0; i < count; i++) {
                Position position = new Position(getProtocolName());
                position.setDeviceId(deviceSession.getDeviceId());

                position.setTime(new Date(buf.readUnsignedInt() * 1000));

                position.set("reason", buf.readUnsignedByte());

                position.setLongitude(buf.readInt() / 10000000.0);
                position.setLatitude(buf.readInt() / 10000000.0);
                position.setAltitude(buf.readShort());
                position.setCourse(buf.readUnsignedShort());

                position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());

                position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
                position.setValid(buf.readUnsignedByte() != 0);

                buf.readUnsignedByte(); // used systems

                buf.readUnsignedByte(); // cause element id

                // Read 1 byte data
                int cnt = buf.readUnsignedByte();
                for (int j = 0; j < cnt; j++) {
                    position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedByte());
                }

                // Read 2 byte data
                cnt = buf.readUnsignedByte();
                for (int j = 0; j < cnt; j++) {
                    position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedShort());
                }

                // Read 4 byte data
                cnt = buf.readUnsignedByte();
                for (int j = 0; j < cnt; j++) {
                    position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedInt());
                }

                // Read 8 byte data
                cnt = buf.readUnsignedByte();
                for (int j = 0; j < cnt; j++) {
                    position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readLong());
                }

                positions.add(position);
            }

            return positions;

        }

        return null;
    }

}