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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@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 java.net.SocketAddress;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.database.DataManager;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class TytanProtocolDecoder extends BaseProtocolDecoder {
public TytanProtocolDecoder(String protocol) {
super(protocol);
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // protocol
int index = buf.readUnsignedByte() >> 3;
if (channel != null) {
ChannelBuffer response = ChannelBuffers.copiedBuffer(
"^" + index, Charset.defaultCharset());
channel.write(response, remoteAddress);
}
String id = String.valueOf(buf.readUnsignedInt());
if (!identify(id)) {
return null;
}
List<Position> positions = new LinkedList<Position>();
while (buf.readable()) {
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter(getProtocol());
position.setDeviceId(getDeviceId());
int end = buf.readerIndex() + buf.readUnsignedByte();
position.setTime(new Date(buf.readUnsignedInt() * 1000));
int flags = buf.readUnsignedByte();
extendedInfo.set("gps", flags >> 5);
extendedInfo.set("gsm", flags & 0x07);
position.setValid(((flags & 0x08) != 0) ^ ((flags & 0x10) != 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);
// Altitude
position.setAltitude(0.0);
// Course
int course = (buf.readUnsignedByte() >> 5) * 45;
course = (course + 180) % 360;
position.setCourse((double) course);
// Speed
int speed = buf.readUnsignedByte();
if (speed >= 250) {
position.setSpeed(0.0);
} else {
position.setSpeed(speed * 0.539957);
}
buf.skipBytes(end - buf.readerIndex());
position.setExtendedInfo(extendedInfo.toString());
positions.add(position);
}
return positions;
}
}
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