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/*
* Copyright 2015 Vijay Kumar (vijaykumar@zilogic.com)
*
* Based on GalileoProtocolDecoder.java
* 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.net.SocketAddress;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Log;
import org.traccar.helper.BitUtil;
import org.traccar.model.Event;
import org.traccar.model.Position;
class DecodeError extends Exception {
public DecodeError(String message) {
super(message);
}
}
public class BlackKiteProtocolDecoder extends BaseProtocolDecoder {
public BlackKiteProtocolDecoder(BlackKiteProtocol protocol) {
super(protocol);
}
private static final int TAG_IMEI = 0x03;
private static final int TAG_DATE = 0x20;
private static final int TAG_COORDINATES = 0x30;
private static final int TAG_SPEED_COURSE = 0x33;
private static final int TAG_ALTITUDE = 0x34;
private static final int TAG_STATUS = 0x40;
private static final int TAG_DIGITAL_OUTPUTS = 0x45;
private static final int TAG_DIGITAL_INPUTS = 0x46;
private static final int TAG_INPUT_VOLTAGE1 = 0x50;
private static final int TAG_INPUT_VOLTAGE2 = 0x51;
private static final int TAG_INPUT_VOLTAGE3 = 0x52;
private static final int TAG_INPUT_VOLTAGE4 = 0x53;
private static final int TAG_XT1 = 0x60;
private static final int TAG_XT2 = 0x61;
private static final int TAG_XT3 = 0x62;
private static final Map<Integer, Integer> tagLengthMap = new HashMap<>();
static {
tagLengthMap.put(TAG_IMEI, 15);
tagLengthMap.put(TAG_DATE, 4);
tagLengthMap.put(TAG_COORDINATES, 9);
tagLengthMap.put(TAG_SPEED_COURSE, 4);
tagLengthMap.put(TAG_ALTITUDE, 2);
tagLengthMap.put(TAG_STATUS, 2);
tagLengthMap.put(TAG_DIGITAL_INPUTS, 2);
tagLengthMap.put(TAG_DIGITAL_OUTPUTS, 2);
tagLengthMap.put(TAG_INPUT_VOLTAGE1, 2);
tagLengthMap.put(TAG_INPUT_VOLTAGE2, 2);
tagLengthMap.put(TAG_INPUT_VOLTAGE3, 2);
tagLengthMap.put(TAG_INPUT_VOLTAGE4, 2);
tagLengthMap.put(TAG_XT1, 16);
tagLengthMap.put(TAG_XT2, 16);
tagLengthMap.put(TAG_XT3, 16);
}
private static int getTagLength(int tag) throws DecodeError {
Integer length = tagLengthMap.get(tag);
if (length == null)
throw new DecodeError(String.format("invalid tag '%d'", tag));
return length;
}
private void sendReply(Channel channel, int checksum) {
ChannelBuffer reply = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 3);
reply.writeByte(0x02);
reply.writeShort((short) checksum);
if (channel != null) {
channel.write(reply);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // header
int length = (buf.readUnsignedShort() & 0x7fff) + 3;
List<Position> positions = new LinkedList<Position>();
Set<Integer> tags = new HashSet<Integer>();
boolean hasLocation = false;
Position position = new Position();
position.setProtocol(getProtocolName());
while (buf.readerIndex() < length) {
// Check if new message started
int tag = buf.readUnsignedByte();
if (tags.contains(tag)) {
if (hasLocation && position.getFixTime() != null) {
positions.add(position);
}
tags.clear();
hasLocation = false;
position = new Position();
}
tags.add(tag);
switch (tag) {
case TAG_IMEI:
String imei = buf.toString(buf.readerIndex(), 15, Charset.defaultCharset());
buf.skipBytes(imei.length());
identify(imei, channel);
break;
case TAG_DATE:
position.setTime(new Date(buf.readUnsignedInt() * 1000));
break;
case TAG_COORDINATES:
hasLocation = true;
position.setValid((buf.readUnsignedByte() & 0xf0) == 0x00);
position.setLatitude(buf.readInt() / 1000000.0);
position.setLongitude(buf.readInt() / 1000000.0);
break;
case TAG_SPEED_COURSE:
position.setSpeed(buf.readUnsignedShort() * 0.0539957);
position.setCourse(buf.readUnsignedShort() * 0.1);
break;
case TAG_ALTITUDE:
position.setAltitude(buf.readShort());
break;
case TAG_STATUS:
int status = buf.readUnsignedShort();
position.set(Event.KEY_IGNITION, BitUtil.check(status, 9));
position.set(Event.KEY_ALARM, BitUtil.check(status, 15));
position.set(Event.KEY_VBATT, BitUtil.check(status, 2));
break;
case TAG_DIGITAL_INPUTS:
int input = buf.readUnsignedShort();
for (int i = 0; i < 16; i++)
position.set(Event.PREFIX_IO + (i + 1), BitUtil.check(input, i));
break;
case TAG_DIGITAL_OUTPUTS:
int output = buf.readUnsignedShort();
for (int i = 0; i < 16; i++)
position.set(Event.PREFIX_IO + (i + 17), BitUtil.check(output, i));
break;
case TAG_INPUT_VOLTAGE1:
position.set(Event.PREFIX_ADC + 1, buf.readUnsignedShort() / 1000.0);
break;
case TAG_INPUT_VOLTAGE2:
position.set(Event.PREFIX_ADC + 2, buf.readUnsignedShort() / 1000.0);
break;
case TAG_INPUT_VOLTAGE3:
position.set(Event.PREFIX_ADC + 3, buf.readUnsignedShort() / 1000.0);
break;
case TAG_INPUT_VOLTAGE4:
position.set(Event.PREFIX_ADC + 4, buf.readUnsignedShort() / 1000.0);
break;
default:
try {
buf.skipBytes(getTagLength(tag));
} catch (DecodeError e) {
Log.warning("Error decoding packet: " + e.getMessage());
return null;
}
break;
}
}
if (hasLocation && position.getFixTime() != null) {
positions.add(position);
}
if (!hasDeviceId()) {
Log.warning("Unknown device");
return null;
}
sendReply(channel, buf.readUnsignedShort());
for (Position p : positions) {
p.setDeviceId(getDeviceId());
}
if (positions.isEmpty()) {
return null;
}
return positions;
}
}
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