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/*
* Copyright 2020 - 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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class WliProtocolDecoder extends BaseProtocolDecoder {
public WliProtocolDecoder(Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
int clazz = buf.readUnsignedByte();
if (clazz == '1') {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
CellTower cellTower = new CellTower();
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
buf.readUnsignedShort(); // length
buf.readUnsignedShort(); // checksum
int type = buf.readUnsignedByte();
buf.readUnsignedByte(); // delimiter
while (buf.readableBytes() > 1) {
int fieldNumber = buf.readUnsignedByte();
buf.readUnsignedByte(); // delimiter
if (buf.getUnsignedByte(buf.readerIndex()) == 0xFF) {
buf.readUnsignedByte(); // binary type indication
int endIndex = buf.readUnsignedShort() + buf.readerIndex();
if (fieldNumber == 52) {
position.setValid(true);
buf.readUnsignedByte(); // reason
buf.readUnsignedByte(); // century
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setFixTime(dateBuilder.getDate());
position.setLatitude(buf.readInt() / 600000.0);
position.setLongitude(buf.readInt() / 600000.0);
position.setSpeed(buf.readUnsignedShort());
position.setCourse(buf.readUnsignedShort() * 0.1);
position.set(Position.KEY_ODOMETER, UnitsConverter.metersFromFeet(buf.readUnsignedInt()));
position.setAltitude(buf.readInt() * 0.1);
}
buf.readerIndex(endIndex);
} else {
int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
String value = buf.readCharSequence(
endIndex - buf.readerIndex(), StandardCharsets.US_ASCII).toString();
int networkFieldsOffset = switch (type) {
case 0xE4 -> 10;
case 0xCB -> 80;
case 0x1E -> 182;
default -> 35;
};
if (fieldNumber - networkFieldsOffset >= 0 && fieldNumber - networkFieldsOffset < 10) {
switch (fieldNumber - networkFieldsOffset) {
case 0 -> cellTower.setMobileCountryCode(Integer.parseInt(value));
case 1 -> cellTower.setMobileNetworkCode(Integer.parseInt(value));
case 2 -> cellTower.setLocationAreaCode(Integer.parseInt(value));
case 3 -> cellTower.setCellId(Long.parseLong(value));
case 4 -> cellTower.setSignalStrength(Integer.parseInt(value));
}
} else {
switch (fieldNumber) {
case 246 -> {
String[] values = value.split(",");
position.set(Position.KEY_POWER, Integer.parseInt(values[2]) * 0.01);
position.set(Position.KEY_BATTERY, Integer.parseInt(values[3]) * 0.01);
}
case 255 -> position.setDeviceTime(new Date(Long.parseLong(value) * 1000));
}
}
}
buf.readUnsignedByte(); // delimiter
}
if (type == 0xE4) {
getLastLocation(position, position.getDeviceTime());
}
if (cellTower.getCellId() != null) {
position.setNetwork(new Network(cellTower));
}
if (!position.getValid()) {
getLastLocation(position, position.getDeviceTime());
}
return position;
} else if (clazz == '2') {
String id = buf.toString(buf.readerIndex(), buf.readableBytes() - 1, StandardCharsets.US_ASCII);
getDeviceSession(channel, remoteAddress, id.substring("wli:".length()));
return null;
}
return null;
}
}
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