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/*
* Copyright 2015 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.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
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.BitUtil;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class TytanProtocolDecoder extends BaseProtocolDecoder {
public TytanProtocolDecoder(TytanProtocol protocol) {
super(protocol);
}
private static float readSwappedFloat(ChannelBuffer buf) {
byte[] bytes = new byte[4];
buf.readBytes(bytes);
return ChannelBuffers.wrappedBuffer(ByteOrder.LITTLE_ENDIAN, bytes).readFloat();
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // protocol
buf.readUnsignedShort(); // length
int index = buf.readUnsignedByte() >> 3;
if (channel != null) {
ChannelBuffer response = ChannelBuffers.copiedBuffer(
"^" + index, Charset.defaultCharset());
channel.write(response, remoteAddress);
}
String id = String.valueOf(buf.readUnsignedInt());
if (!identify(id, channel, remoteAddress)) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() > 2) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
int end = buf.readerIndex() + buf.readUnsignedByte();
position.setTime(new Date(buf.readUnsignedInt() * 1000));
int flags = buf.readUnsignedByte();
position.set(Event.KEY_SATELLITES, BitUtil.range(flags, 2));
position.setValid(BitUtil.range(flags, 0, 2) > 0);
// Latitude
double lat = buf.readUnsignedMedium();
lat = lat * -180 / 16777216 + 90;
position.setLatitude(lat);
// Longitude
double lon = buf.readUnsignedMedium();
lon = lon * 360 / 16777216 - 180;
position.setLongitude(lon);
// Status
flags = buf.readUnsignedByte();
position.set(Event.KEY_STATUS, flags & 0x1f);
position.setCourse((BitUtil.range(flags, 5) * 45 + 180) % 360);
// Speed
int speed = buf.readUnsignedByte();
if (speed < 250) {
position.setSpeed(UnitsConverter.knotsFromKph(speed));
}
while (buf.readerIndex() < end) {
int type = buf.readUnsignedByte();
int length = buf.readUnsignedByte();
if (length == 255) {
length += buf.readUnsignedByte();
}
switch (type) {
case 2:
position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
break;
case 5:
position.set(Event.KEY_INPUT, buf.readUnsignedByte());
break;
case 6:
{
int n = buf.readUnsignedByte() >> 4;
if (n < 2) {
position.set(Event.PREFIX_ADC + n, readSwappedFloat(buf));
} else {
position.set("di" + (n - 2), readSwappedFloat(buf));
}
}
break;
case 7:
position.set(Event.KEY_ALARM, buf.readUnsignedShort());
break;
case 8:
position.set("antihijack", buf.readUnsignedByte());
break;
case 9:
position.set("authorized", ChannelBufferTools.readHexString(buf, 16));
break;
case 10:
position.set("unauthorized", ChannelBufferTools.readHexString(buf, 16));
break;
case 24:
{
Set<Integer> temps = new LinkedHashSet<>();
int temp = buf.readUnsignedByte();
for (int i = 3; i >= 0; i--) {
int n = (temp >> (2 * i)) & 0x03;
if (!temps.contains(n)) {
temps.add(n);
}
}
for (int n : temps) {
position.set(Event.PREFIX_TEMP + n, buf.readUnsignedByte());
}
}
break;
case 28:
position.set("weight", buf.readUnsignedShort());
buf.readUnsignedByte();
break;
case 90:
position.set(Event.KEY_POWER, readSwappedFloat(buf));
break;
case 107:
position.set(Event.KEY_FUEL, buf.readUnsignedShort() & 0x3fff);
break;
case 150:
position.set("door", buf.readUnsignedByte());
break;
default:
buf.skipBytes(length);
break;
}
}
positions.add(position);
}
return positions;
}
}
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