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/*
* Copyright 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.net.SocketAddress;
import java.util.Calendar;
import java.util.TimeZone;
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.helper.ChannelBufferTools;
import org.traccar.helper.Crc;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class KhdProtocolDecoder extends BaseProtocolDecoder {
public KhdProtocolDecoder(KhdProtocol protocol) {
super(protocol);
}
private String readSerialNumber(ChannelBuffer buf) {
int b1 = buf.readUnsignedByte();
int b2 = buf.readUnsignedByte(); if (b2 > 0x80) b2 -= 0x80;
int b3 = buf.readUnsignedByte(); if (b3 > 0x80) b3 -= 0x80;
int b4 = buf.readUnsignedByte();
String serialNumber = String.format("%02d%02d%02d%02d", b1, b2, b3, b4);
return String.valueOf(Long.valueOf(serialNumber));
}
private static final int MSG_LOGIN = 0xB1;
private static final int MSG_CONFIRMATION = 0x21;
private static final int MSG_ON_DEMAND = 0x81;
private static final int MSG_POSITION_UPLOAD = 0x80;
private static final int MSG_POSITION_REUPLOAD = 0x8E;
private static final int MSG_ALARM = 0x82;
private static final int MSG_REPLY = 0x85;
private static final int MSG_PERIPHERAL = 0xA3;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // size
if (type == MSG_ON_DEMAND ||
type == MSG_POSITION_UPLOAD ||
type == MSG_POSITION_REUPLOAD ||
type == MSG_ALARM ||
type == MSG_REPLY ||
type == MSG_PERIPHERAL) {
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
// Device identification
if (!identify(readSerialNumber(buf), channel)) {
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);
if (type == MSG_ALARM) {
buf.skipBytes(2);
} else {
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
// Status
buf.skipBytes(4);
// Other
buf.skipBytes(8);
}
// TODO: parse extra data
return position;
}
else if (type == MSG_LOGIN && channel != null) {
buf.skipBytes(4); // serial number
buf.readByte(); // reserved
ChannelBuffer response = ChannelBuffers.directBuffer(10);
response.writeByte(0x29); response.writeByte(0x29); // header
response.writeByte(MSG_CONFIRMATION);
response.writeShort(5); // size
response.writeByte(buf.readUnsignedByte());
response.writeByte(type);
response.writeByte(0); // reserved
response.writeByte(Crc.xorChecksum(response.toByteBuffer(0, 8)));
response.writeByte(0x0D); // ending
channel.write(response);
}
return null;
}
}
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