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/*
* Copyright 2021 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BcdUtil;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.LinkedList;
import java.util.List;
public class Gs100ProtocolDecoder extends BaseProtocolDecoder {
public Gs100ProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
String header = buf.readCharSequence(2, StandardCharsets.US_ASCII).toString();
if (header.equals("GL")) {
buf.skipBytes(1);
String imei = buf.readCharSequence(buf.readUnsignedByte(), StandardCharsets.US_ASCII).toString();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (channel != null && deviceSession != null) {
ByteBuf response = Unpooled.copiedBuffer("GS100", StandardCharsets.US_ASCII);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return null;
} else {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
int endIndex = buf.readUnsignedByte() + buf.readerIndex();
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int status = buf.readUnsignedMedium();
position.set(Position.KEY_STATUS, status);
if (BitUtil.check(status, 8 + 8 + 7)) {
DateBuilder dateBuilder = new DateBuilder()
.setHour(BcdUtil.readInteger(buf, 2))
.setMinute(BcdUtil.readInteger(buf, 2))
.setSecond(BcdUtil.readInteger(buf, 2))
.setDay(BcdUtil.readInteger(buf, 2))
.setMonth(BcdUtil.readInteger(buf, 2))
.setYear(BcdUtil.readInteger(buf, 2));
position.setTime(dateBuilder.getDate());
position.setValid(true);
String coordinates = ByteBufUtil.hexDump(buf.readSlice(9));
position.setLongitude(Integer.parseInt(coordinates.substring(0, 3))
+ Integer.parseInt(coordinates.substring(3, 9)) * 0.0001 / 60);
position.setLatitude(Integer.parseInt(coordinates.substring(10, 12))
+ Integer.parseInt(coordinates.substring(12, 18)) * 0.0001 / 60);
int flags = Integer.parseInt(coordinates.substring(9, 10), 16);
if (!BitUtil.check(flags, 3)) {
position.setLongitude(-position.getLongitude());
}
if (!BitUtil.check(flags, 2)) {
position.setLatitude(-position.getLatitude());
}
String other = ByteBufUtil.hexDump(buf.readSlice(4));
position.setSpeed(UnitsConverter.knotsFromKph(Integer.parseInt(other.substring(0, 5)) * 0.01));
position.setCourse(Integer.parseInt(other.substring(5, 8)));
} else {
getLastLocation(position, null);
}
positions.add(position);
buf.readerIndex(endIndex);
}
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeCharSequence("GS100", StandardCharsets.US_ASCII);
response.writeByte(count);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return positions.isEmpty() ? null : positions;
}
}
}
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