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/*
* Copyright 2013 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.nio.charset.Charset;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
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.ServerManager;
import org.traccar.helper.Log;
import org.traccar.model.Position;
public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
private long deviceId;
public TeltonikaProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
private void parseIdentification(Channel channel, ChannelBuffer buf) {
boolean result = false;
int length = buf.readUnsignedShort();
String imei = buf.toString(buf.readerIndex(), length, Charset.defaultCharset());
try {
deviceId = getDataManager().getDeviceByImei(imei).getId();
result = true;
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
}
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(1);
response.writeByte(result ? 1 : 0);
channel.write(response);
}
}
private List<Position> parseLocation(Channel channel, ChannelBuffer buf) {
List<Position> positions = new LinkedList<Position>();
buf.skipBytes(4); // marker
buf.readUnsignedInt(); // data length
buf.readUnsignedByte(); // codec
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = new Position();
StringBuilder extendedInfo = new StringBuilder("<protocol>teltonika</protocol>");
position.setDeviceId(deviceId);
position.setTime(new Date(buf.readLong()));
extendedInfo.append("<priority>");
extendedInfo.append(buf.readUnsignedByte());
extendedInfo.append("</priority>");
position.setLongitude(buf.readUnsignedInt() / 10000000.0);
position.setLatitude(buf.readUnsignedInt() / 10000000.0);
position.setAltitude((double) buf.readUnsignedShort());
position.setCourse((double) buf.readUnsignedShort());
extendedInfo.append("<satellites>");
int satellites = buf.readUnsignedByte();
extendedInfo.append(satellites);
extendedInfo.append("</satellites>");
position.setValid(satellites != 0);
position.setSpeed((double) buf.readUnsignedShort());
extendedInfo.append("<event>");
extendedInfo.append(buf.readUnsignedByte());
extendedInfo.append("</event>");
// Skip IO data
buf.readUnsignedByte(); // total IO data records
buf.skipBytes(buf.readUnsignedByte() * (1 + 1));
buf.skipBytes(buf.readUnsignedByte() * (1 + 2));
buf.skipBytes(buf.readUnsignedByte() * (1 + 4));
buf.skipBytes(buf.readUnsignedByte() * (1 + 8));
position.setExtendedInfo(extendedInfo.toString());
positions.add(position);
}
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(4);
response.writeInt(count);
channel.write(response);
}
return positions;
}
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
if (buf.getUnsignedShort(0) > 0) {
parseIdentification(channel, buf);
} else {
return parseLocation(channel, buf);
}
return null;
}
}
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