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/*
* Copyright 2013 - 2016 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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
public TeltonikaProtocolDecoder(TeltonikaProtocol protocol) {
super(protocol);
}
private void parseIdentification(Channel channel, SocketAddress remoteAddress, ChannelBuffer buf) {
int length = buf.readUnsignedShort();
String imei = buf.toString(buf.readerIndex(), length, StandardCharsets.US_ASCII);
boolean result = identify(imei, channel, remoteAddress);
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(1);
if (result) {
response.writeByte(1);
} else {
response.writeByte(0);
}
channel.write(response);
}
}
private static final int CODEC_GH3000 = 0x07;
private static final int CODEC_FM4X00 = 0x08;
private static final int CODEC_12 = 0x0C;
private void decodeSerial(Position position, ChannelBuffer buf) {
getLastLocation(position, null);
position.set(Position.KEY_TYPE, buf.readUnsignedByte());
position.set("command", buf.readBytes(buf.readInt()).toString(StandardCharsets.US_ASCII));
}
private void decodeLocation(Position position, ChannelBuffer buf, int codec) {
int globalMask = 0x0f;
if (codec == CODEC_GH3000) {
long time = buf.readUnsignedInt() & 0x3fffffff;
time += 1167609600; // 2007-01-01 00:00:00
globalMask = buf.readUnsignedByte();
if (BitUtil.check(globalMask, 0)) {
position.setTime(new Date(time * 1000));
int locationMask = buf.readUnsignedByte();
if (BitUtil.check(locationMask, 0)) {
position.setLatitude(buf.readFloat());
position.setLongitude(buf.readFloat());
}
if (BitUtil.check(locationMask, 1)) {
position.setAltitude(buf.readUnsignedShort());
}
if (BitUtil.check(locationMask, 2)) {
position.setCourse(buf.readUnsignedByte() * 360.0 / 256);
}
if (BitUtil.check(locationMask, 3)) {
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
}
if (BitUtil.check(locationMask, 4)) {
int satellites = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, satellites);
position.setValid(satellites >= 3);
}
if (BitUtil.check(locationMask, 5)) {
position.set(Position.KEY_LAC, buf.readUnsignedShort());
position.set(Position.KEY_CID, buf.readUnsignedShort());
}
if (BitUtil.check(locationMask, 6)) {
position.set(Position.KEY_GSM, buf.readUnsignedByte());
}
if (BitUtil.check(locationMask, 7)) {
position.set("operator", buf.readUnsignedInt());
}
} else {
getLastLocation(position, new Date(time * 1000));
}
} 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(Position.KEY_SATELLITES, satellites);
position.setValid(satellites != 0);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.set(Position.KEY_EVENT, buf.readUnsignedByte());
buf.readUnsignedByte(); // total IO data records
}
// Read 1 byte data
if (BitUtil.check(globalMask, 1)) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
int id = buf.readUnsignedByte();
if (id == 1) {
position.set(Position.KEY_POWER, buf.readUnsignedByte());
} else {
position.set(Position.PREFIX_IO + id, buf.readUnsignedByte());
}
}
}
// Read 2 byte data
if (BitUtil.check(globalMask, 2)) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readUnsignedShort());
}
}
// Read 4 byte data
if (BitUtil.check(globalMask, 3)) {
int cnt = buf.readUnsignedByte();
for (int j = 0; j < cnt; j++) {
position.set(Position.PREFIX_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(Position.PREFIX_IO + buf.readUnsignedByte(), buf.readLong());
}
}
}
private List<Position> parseData(Channel channel, ChannelBuffer buf) {
List<Position> positions = new LinkedList<>();
buf.skipBytes(4); // marker
buf.readUnsignedInt(); // data length
int codec = buf.readUnsignedByte();
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
if (codec == CODEC_12) {
decodeSerial(position, buf);
} else {
decodeLocation(position, buf, codec);
}
positions.add(position);
}
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(4);
response.writeInt(count);
channel.write(response);
}
return positions;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
if (buf.getUnsignedShort(0) > 0) {
parseIdentification(channel, remoteAddress, buf);
} else {
return parseData(channel, buf);
}
return null;
}
}
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