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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.Calendar;
import java.util.Date;
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.Crc;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class CastelProtocolDecoder extends BaseProtocolDecoder {
public CastelProtocolDecoder(String protocol) {
super(protocol);
}
private static final short MSG_LOGIN = 0x1001;
private static final short MSG_LOGIN_RESPONSE = (short) 0x9001;
private static final short MSG_HEARTBEAT = 0x1003;
private static final short MSG_HEARTBEAT_RESPONSE = (short) 0x9003;
private static final short MSG_GPS = 0x4001;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
buf.readUnsignedShort(); // length
int version = buf.readUnsignedByte();
ChannelBuffer id = buf.readBytes(20);
int type = ChannelBuffers.swapShort(buf.readShort());
if (type == MSG_HEARTBEAT) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 31);
response.writeByte(0x40); response.writeByte(0x40);
response.writeShort(response.capacity());
response.writeByte(version);
response.writeBytes(id);
response.writeShort(ChannelBuffers.swapShort(MSG_HEARTBEAT_RESPONSE));
response.writeShort(Crc.crc16Ccitt(response.toByteBuffer(0, response.writerIndex())));
response.writeByte(0x0D); response.writeByte(0x0A);
channel.write(response, remoteAddress);
}
} else if (type == MSG_LOGIN || type == MSG_GPS) {
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocol());
if (!identify(id.toString(Charset.defaultCharset()))) {
return null;
} else if (type == MSG_LOGIN) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 41);
response.writeByte(0x40); response.writeByte(0x40);
response.writeShort(response.capacity());
response.writeByte(version);
response.writeBytes(id);
response.writeShort(ChannelBuffers.swapShort(MSG_LOGIN_RESPONSE));
response.writeInt(0xFFFFFFFF);
response.writeShort(0);
response.writeInt((int) (new Date().getTime() / 1000));
response.writeShort(Crc.crc16Ccitt(response.toByteBuffer(0, response.writerIndex())));
response.writeByte(0x0D); response.writeByte(0x0A);
channel.write(response, remoteAddress);
}
}
if (type == MSG_GPS) {
buf.readUnsignedByte(); // historical
}
buf.readUnsignedInt(); // ACC ON time
buf.readUnsignedInt(); // UTC time
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
buf.readUnsignedInt(); // trip odometer
buf.readUnsignedInt(); // total fuel consumption
buf.readUnsignedShort(); // current fuel consumption
position.set(Event.KEY_STATUS, buf.readUnsignedInt());
buf.skipBytes(8);
buf.readUnsignedByte(); // count
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
position.setTime(time.getTime());
double lat = buf.readUnsignedInt() / 3600000.0;
double lon = buf.readUnsignedInt() / 3600000.0;
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.setCourse(buf.readUnsignedShort());
int flags = buf.readUnsignedByte();
position.setLatitude((flags & 0x01) == 0 ? -lat : lat);
position.setLongitude((flags & 0x02) == 0 ? -lon : lon);
position.setValid((flags & 0x0C) > 0);
position.set(Event.KEY_SATELLITES, flags >> 4);
return position;
}
return null;
}
}
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