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/*
* 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.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class TytanProtocolDecoder extends BaseProtocolDecoder {
public TytanProtocolDecoder(TytanProtocol protocol) {
super(protocol);
}
private void decodeExtraData(Position position, ByteBuf buf, int end) {
while (buf.readerIndex() < end) {
int type = buf.readUnsignedByte();
int length = buf.readUnsignedByte();
if (length == 255) {
length += buf.readUnsignedByte();
}
int n;
switch (type) {
case 2:
position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedMedium());
break;
case 5:
position.set(Position.KEY_INPUT, buf.readUnsignedByte());
break;
case 6:
n = buf.readUnsignedByte() >> 4;
if (n < 2) {
position.set(Position.PREFIX_ADC + n, buf.readFloat());
} else {
position.set("di" + (n - 2), buf.readFloat());
}
break;
case 7:
int alarm = buf.readUnsignedByte();
buf.readUnsignedByte();
if (BitUtil.check(alarm, 5)) {
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
}
break;
case 8:
position.set("antihijack", buf.readUnsignedByte());
break;
case 9:
position.set("unauthorized", ByteBufUtil.hexDump(buf.readSlice(8)));
break;
case 10:
position.set("authorized", ByteBufUtil.hexDump(buf.readSlice(8)));
break;
case 24:
for (int i = 0; i < length / 2; i++) {
position.set(Position.PREFIX_TEMP + buf.readUnsignedByte(), buf.readByte());
}
break;
case 28:
position.set(Position.KEY_AXLE_WEIGHT, buf.readUnsignedShort());
buf.readUnsignedByte();
break;
case 90:
position.set(Position.KEY_POWER, buf.readFloat());
break;
case 101:
position.set(Position.KEY_OBD_SPEED, buf.readUnsignedByte());
break;
case 102:
position.set(Position.KEY_RPM, buf.readUnsignedByte() * 50);
break;
case 107:
int fuel = buf.readUnsignedShort();
int fuelFormat = fuel >> 14;
if (fuelFormat == 1) {
position.set("fuelValue", (fuel & 0x3fff) * 0.4 + "%");
} else if (fuelFormat == 2) {
position.set("fuelValue", (fuel & 0x3fff) * 0.5 + " l");
} else if (fuelFormat == 3) {
position.set("fuelValue", (fuel & 0x3fff) * -0.5 + " l");
}
break;
case 108:
position.set(Position.KEY_OBD_ODOMETER, buf.readUnsignedInt() * 5);
break;
case 150:
position.set(Position.KEY_DOOR, buf.readUnsignedByte());
break;
default:
buf.skipBytes(length);
break;
}
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // protocol
buf.readUnsignedShort(); // length
int index = buf.readUnsignedByte() >> 3;
if (channel != null) {
ByteBuf response = Unpooled.copiedBuffer(
"^" + index, StandardCharsets.US_ASCII);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
String id = String.valueOf(buf.readUnsignedInt());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() > 2) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int end = buf.readerIndex() + buf.readUnsignedByte();
position.setTime(new Date(buf.readUnsignedInt() * 1000));
int flags = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, BitUtil.from(flags, 2));
position.setValid(BitUtil.to(flags, 2) > 0);
// Latitude
double lat = buf.readUnsignedMedium();
lat = lat * -180 / 16777216 + 90;
position.setLatitude(lat);
// Longitude
double lon = buf.readUnsignedMedium();
lon = lon * 360 / 16777216 - 180;
position.setLongitude(lon);
// Status
flags = buf.readUnsignedByte();
position.set(Position.KEY_IGNITION, BitUtil.check(flags, 0));
position.set(Position.KEY_RSSI, BitUtil.between(flags, 2, 5));
position.setCourse((BitUtil.from(flags, 5) * 45 + 180) % 360);
// Speed
int speed = buf.readUnsignedByte();
if (speed < 250) {
position.setSpeed(UnitsConverter.knotsFromKph(speed));
}
decodeExtraData(position, buf, end);
positions.add(position);
}
return positions;
}
}
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