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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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
import java.util.Date;
public class UlbotechProtocolDecoder extends BaseProtocolDecoder {
public UlbotechProtocolDecoder(String protocol) {
super(protocol);
}
private static final short DATA_GPS = 0x01;
private static final short DATA_LBS = 0x02;
private static final short DATA_STATUS = 0x03;
private static final short DATA_ODOMETER = 0x04;
private static final short DATA_ADC = 0x05;
private static final short DATA_GEOFENCE = 0x06;
private static final short DATA_OBD2 = 0x07;
private static final short DATA_FUEL = 0x08;
private static final short DATA_OBD2_ALARM = 0x09;
private static final short DATA_HARSH_DRIVER = 0x0A;
private static final short DATA_CANBUS = 0x0B;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readByte(); // header
buf.readUnsignedByte(); // version
buf.readUnsignedByte(); // type
// Create new position
Position position = new Position();
position.setProtocol(getProtocol());
// Get device id
String imei = ChannelBufferTools.readHexString(buf, 16).substring(1);
if (!identify(imei)) {
return null;
}
position.setDeviceId(getDeviceId());
// Time
long seconds = buf.readUnsignedInt() & 0x7fffffffl;
seconds += 946684800l; // 2000-01-01 00:00
position.setTime(new Date(seconds * 1000));
boolean hasLocation = false;
while (buf.readableBytes() > 3) {
short type = buf.readUnsignedByte();
short length = buf.readUnsignedByte();
switch (type) {
case DATA_GPS:
hasLocation = true;
position.setValid(true);
position.setLatitude(buf.readInt() / 1000000.0);
position.setLongitude(buf.readInt() / 1000000.0);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.setCourse(buf.readUnsignedShort());
position.set(Event.KEY_HDOP, buf.readUnsignedShort());
break;
default:
buf.skipBytes(length);
break;
}
}
if (hasLocation) {
return position;
}
return null;
}
}
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