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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.model.Position;
public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
private long deviceId;
public TeltonikaProtocolDecoder(String protocol) {
super(protocol);
}
private void parseIdentification(Channel channel, ChannelBuffer buf) {
boolean result = false;
int length = buf.readUnsignedShort();
String imei = buf.toString(buf.readerIndex(), length, Charset.defaultCharset());
result = identify(imei);
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(1);
response.writeByte(result ? 1 : 0);
channel.write(response);
}
}
private static boolean checkBit(long mask, int bit) {
long checkMask = 1 << bit;
return (mask & checkMask) == checkMask;
}
private static final int CODEC_GH3000 = 0x07;
private static final int CODEC_FM4X00 = 0x08;
private static final int CODEC_12 = 0x0C;
private List<Position> parseLocation(Channel channel, ChannelBuffer buf) {
List<Position> positions = new LinkedList<Position>();
buf.skipBytes(4); // marker
buf.readUnsignedInt(); // data length
int codec = buf.readUnsignedByte(); // codec
if (codec == CODEC_12) {
// TODO: decode serial port data
return null;
}
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = new Position();
position.setProtocol(getProtocol());
position.setDeviceId(deviceId);
int globalMask = 0x0f;
if (codec == CODEC_GH3000) {
long time = buf.readUnsignedInt() & 0x3fffffff;
time += 1167609600; // 2007-01-01 00:00:00
position.setTime(new Date(time * 1000));
globalMask = buf.readUnsignedByte();
if (!checkBit(globalMask, 0)) {
return null;
}
int locationMask = buf.readUnsignedByte();
if (checkBit(locationMask, 0)) {
position.setLatitude(Double.valueOf(buf.readFloat()));
position.setLongitude(Double.valueOf(buf.readFloat()));
}
if (checkBit(locationMask, 1)) {
position.setAltitude(buf.readUnsignedShort());
}
if (checkBit(locationMask, 2)) {
position.setCourse(buf.readUnsignedByte() * 360.0 / 256);
}
if (checkBit(locationMask, 3)) {
position.setSpeed(buf.readUnsignedByte() * 0.539957);
}
if (checkBit(locationMask, 4)) {
int satellites = buf.readUnsignedByte();
position.set("satellites", satellites);
position.setValid(satellites >= 3);
}
if (checkBit(locationMask, 5)) {
position.set("area", buf.readUnsignedShort());
position.set("cell", buf.readUnsignedShort());
}
if (checkBit(locationMask, 6)) {
position.set("gsm", buf.readUnsignedByte());
}
if (checkBit(locationMask, 7)) {
position.set("operator", buf.readUnsignedInt());
}
} else {
position.setTime(new Date(buf.readLong()));
position.set("priority", buf.readUnsignedByte());
position.setLongitude(buf.readInt() / 10000000.0);
position.setLatitude(buf.readInt() / 10000000.0);
position.setAltitude(buf.readShort());
position.setCourse(buf.readUnsignedShort());
int satellites = buf.readUnsignedByte();
position.set("satellites", satellites);
position.setValid(satellites != 0);
position.setSpeed(buf.readUnsignedShort() * 0.539957);
position.set("event", buf.readUnsignedByte());
buf.readUnsignedByte(); // total IO data records
}
// Read 1 byte data
if (checkBit(globalMask, 1)) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
int id = buf.readUnsignedByte();
if (id == 1) {
position.set("power", buf.readUnsignedByte());
} else {
position.set("io" + id, buf.readUnsignedByte());
}
}
}
// Read 2 byte data
if (checkBit(globalMask, 2)) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set("io" + buf.readUnsignedByte(), buf.readUnsignedShort());
}
}
// Read 4 byte data
if (checkBit(globalMask, 3)) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set("io" + buf.readUnsignedByte(), buf.readUnsignedInt());
}
}
// Read 8 byte data
if (codec == CODEC_FM4X00) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set("io" + buf.readUnsignedByte(), buf.readLong());
}
}
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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