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/*
* Copyright 2013 - 2014 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.util.Calendar;
import java.util.TimeZone;
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;
public class GatorProtocolDecoder extends BaseProtocolDecoder {
public GatorProtocolDecoder(String protocol) {
super(protocol);
}
private static final int PACKET_HEARTBEAT = 0x21;
private static final int PACKET_POSITION_DATA = 0x80;
private static final int PACKET_ROLLCALL_RESPONSE = 0x81;
private static final int PACKET_ALARM_DATA = 0x82;
private static final int PACKET_TERMINAL_STATUS = 0x83;
private static final int PACKET_MESSAGE = 0x84;
private static final int PACKET_TERMINAL_ANSWER = 0x85;
private static final int PACKET_BLIND_AREA = 0x8E;
private static final int PACKET_PICTURE_FRAME = 0x54;
private static final int PACKET_CAMERA_RESPONSE = 0x56;
private static final int PACKET_PICTURE_DATA = 0x57;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
// Pseudo IP address
String id = String.format("%02d%02d%02d%02d",
buf.readUnsignedByte(), buf.readUnsignedByte(),
buf.readUnsignedByte(), buf.readUnsignedByte());
id = id.replaceFirst("^0+(?!$)", "");
if (type == PACKET_POSITION_DATA ||
type == PACKET_ROLLCALL_RESPONSE ||
type == PACKET_ALARM_DATA ||
type == PACKET_BLIND_AREA) {
// Create new position
Position position = new Position();
position.setProtocol(getProtocol());
// Identification
if (!identify(id)) {
return null;
}
position.setDeviceId(getDeviceId());
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MONTH, ChannelBufferTools.readHexInteger(buf, 2) - 1);
time.set(Calendar.DAY_OF_MONTH, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.HOUR_OF_DAY, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MINUTE, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.SECOND, ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(time.getTime());
// Location
position.setLatitude(ChannelBufferTools.readCoordinate(buf));
position.setLongitude(ChannelBufferTools.readCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(ChannelBufferTools.readHexInteger(buf, 4)));
position.setCourse(ChannelBufferTools.readHexInteger(buf, 4));
// Flags
int flags = buf.readUnsignedByte();
position.setValid((flags & 0x80) != 0);
position.set(Event.KEY_SATELLITES, flags & 0x0f);
// Status
position.set(Event.KEY_STATUS, buf.readUnsignedByte());
// Key switch
position.set("key", buf.readUnsignedByte());
// Oil
position.set("oil", buf.readUnsignedShort() / 10.0);
// Power
position.set(Event.KEY_POWER, buf.readUnsignedByte() + buf.readUnsignedByte() / 100.0);
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
return position;
}
return null;
}
}
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