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/*
* Copyright 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class AnytrekProtocolDecoder extends BaseProtocolDecoder {
public AnytrekProtocolDecoder(Protocol protocol) {
super(protocol);
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, int type) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(0x7878);
response.writeShortLE(1 + 1 + 2 + 1 + 2); // length
response.writeByte(type);
response.writeByte(0); // error
response.writeShortLE(0); // report interval
response.writeByte(0); // clear alarm
response.writeShortLE(0); // checksum
response.writeByte('\r');
response.writeByte('\n');
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.readUnsignedShortLE(); // size
int type = buf.readUnsignedByte();
String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(2);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_VERSION_FW, buf.readUnsignedShortLE());
position.set(Position.KEY_BATTERY, buf.readUnsignedShortLE() * 0.01);
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
position.set(Position.KEY_SATELLITES, BitUtil.to(buf.readUnsignedByte(), 4));
double latitude = buf.readUnsignedIntLE() / 1800000.0;
double longitude = buf.readUnsignedIntLE() / 1800000.0;
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
int flags = buf.readUnsignedShortLE();
position.setCourse(BitUtil.to(flags, 10));
position.setValid(BitUtil.check(flags, 12));
if (!BitUtil.check(flags, 10)) {
latitude = -latitude;
}
if (BitUtil.check(flags, 11)) {
longitude = -longitude;
}
position.setLatitude(latitude);
position.setLongitude(longitude);
buf.readUnsignedIntLE(); // info index
buf.readUnsignedIntLE(); // setting index
flags = buf.readUnsignedByte();
position.set(Position.KEY_CHARGE, BitUtil.check(flags, 0));
position.set(Position.KEY_IGNITION, BitUtil.check(flags, 1));
position.set(Position.KEY_ALARM, BitUtil.check(flags, 4) ? Position.ALARM_GENERAL : null);
buf.readUnsignedShortLE(); // charge current
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
sendResponse(channel, remoteAddress, type);
return position;
}
}
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