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/*
* Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
* Copyright 2015 Vitaly Litvak (vitavaque@gmail.com)
*
* 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.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
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.LinkedList;
import java.util.List;
public class AutoFonProtocolDecoder extends BaseProtocolDecoder {
public AutoFonProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN = 0x10;
public static final int MSG_LOCATION = 0x11;
public static final int MSG_HISTORY = 0x12;
public static final int MSG_45_LOGIN = 0x41;
public static final int MSG_45_LOCATION = 0x02;
private static double convertCoordinate(int raw) {
int degrees = raw / 1000000;
double minutes = (raw % 1000000) / 10000.0;
return degrees + minutes / 60;
}
private static double convertCoordinate(short degrees, int minutes) {
double value = degrees + BitUtil.from(minutes, 4) / 600000.0;
if (BitUtil.check(minutes, 0)) {
return value;
} else {
return -value;
}
}
private Position decodePosition(DeviceSession deviceSession, ByteBuf buf, boolean history) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
if (!history) {
buf.readUnsignedByte(); // interval
buf.skipBytes(8); // settings
}
position.set(Position.KEY_STATUS, buf.readUnsignedByte());
if (!history) {
buf.readUnsignedShort();
}
position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
buf.skipBytes(6); // time
if (!history) {
for (int i = 0; i < 2; i++) {
buf.skipBytes(5); // time
buf.readUnsignedShort(); // interval
buf.skipBytes(5); // mode
}
}
position.set(Position.PREFIX_TEMP + 1, buf.readByte());
int rssi = buf.readUnsignedByte();
CellTower cellTower = CellTower.from(
buf.readUnsignedShort(), buf.readUnsignedShort(),
buf.readUnsignedShort(), buf.readUnsignedShort(), rssi);
position.setNetwork(new Network(cellTower));
int valid = buf.readUnsignedByte();
position.setValid((valid & 0xc0) != 0);
position.set(Position.KEY_SATELLITES, valid & 0x3f);
DateBuilder dateBuilder = new DateBuilder()
.setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
position.setLatitude(convertCoordinate(buf.readInt()));
position.setLongitude(convertCoordinate(buf.readInt()));
position.setAltitude(buf.readShort());
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedByte() * 2.0);
position.set(Position.KEY_HDOP, buf.readUnsignedShort());
buf.readUnsignedShort(); // reserved
buf.readUnsignedByte(); // checksum
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readUnsignedByte();
if (type == MSG_LOGIN || type == MSG_45_LOGIN) {
if (type == MSG_LOGIN) {
buf.readUnsignedByte(); // hardware version
buf.readUnsignedByte(); // software version
}
String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession != null && channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeBytes("resp_crc=".getBytes(StandardCharsets.US_ASCII));
response.writeByte(buf.getByte(buf.writerIndex() - 1));
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
if (type == MSG_LOCATION) {
return decodePosition(deviceSession, buf, false);
} else if (type == MSG_HISTORY) {
int count = buf.readUnsignedByte() & 0x0f;
buf.readUnsignedShort(); // total count
List<Position> positions = new LinkedList<>();
for (int i = 0; i < count; i++) {
positions.add(decodePosition(deviceSession, buf, true));
}
return positions;
} else if (type == MSG_45_LOCATION) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
short status = buf.readUnsignedByte();
if (BitUtil.check(status, 7)) {
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
}
position.set(Position.KEY_BATTERY, BitUtil.to(status, 7));
buf.skipBytes(2); // remaining time
position.set(Position.PREFIX_TEMP + 1, buf.readByte());
buf.skipBytes(2); // timer (interval and units)
buf.readByte(); // mode
buf.readByte(); // gprs sending interval
buf.skipBytes(6); // mcc, mnc, lac, cid
int valid = buf.readUnsignedByte();
position.setValid(BitUtil.from(valid, 6) != 0);
position.set(Position.KEY_SATELLITES, BitUtil.from(valid, 6));
int time = buf.readUnsignedMedium();
int date = buf.readUnsignedMedium();
DateBuilder dateBuilder = new DateBuilder()
.setTime(time / 10000, time / 100 % 100, time % 100)
.setDateReverse(date / 10000, date / 100 % 100, date % 100);
position.setTime(dateBuilder.getDate());
position.setLatitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
position.setLongitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedShort());
return position;
}
return null;
}
}
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