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/*
* Copyright 2012 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.Calendar;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.ServerManager;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.Log;
import org.traccar.model.Position;
/**
* JT600 protocol decoder
*/
public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
/**
* Initialize
*/
public Jt600ProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
/**
* Decode regular message
*/
private Position decodeNormalMessage(ChannelBuffer buf) throws Exception {
Position position = new Position();
buf.readByte(); // header
// Get device by identifier
String id = Long.valueOf(ChannelBufferTools.readHexString(buf, 10)).toString();
try {
position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + id);
return null;
}
buf.readByte(); // protocol version + data type
buf.readBytes(2); // length
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.DAY_OF_MONTH, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MONTH, ChannelBufferTools.readHexInteger(buf, 2) - 1);
time.set(Calendar.YEAR, 2000 + ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.HOUR, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MINUTE, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.SECOND, ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(time.getTime());
// Coordinates
int temp = ChannelBufferTools.readHexInteger(buf, 8);
double latitude = temp % 1000000;
latitude /= 60 * 10000;
latitude += temp / 1000000;
temp = ChannelBufferTools.readHexInteger(buf, 9);
double longitude = temp % 1000000;
longitude /= 60 * 10000;
longitude += temp / 1000000;
// Flags
byte flags = buf.readByte();
position.setValid((flags & 0x1) == 0x1);
if ((flags & 0x2) == 0) latitude = -latitude;
position.setLatitude(latitude);
if ((flags & 0x4) == 0) longitude = -longitude;
position.setLongitude(longitude);
// Speed
double speed = ChannelBufferTools.readHexInteger(buf, 2);
position.setSpeed(speed);
// Course
double course = buf.readUnsignedByte() * 2;
position.setCourse(course);
buf.readByte(); // number of satellites
// Course
double power = buf.readUnsignedByte();
position.setPower(power);
buf.readByte(); // other flags and sensors
// Altitude
double altitude = buf.readUnsignedShort();
position.setAltitude(altitude);
buf.readUnsignedShort(); // cell id
buf.readUnsignedShort(); // lac
buf.readUnsignedByte(); // gsm signal
buf.readUnsignedByte(); // message number
return position;
}
/**
* Alert message pattern
*/
static private Pattern pattern = Pattern.compile(
"\\(" +
"([\\d]+)," + // Id
"W01," + // Type
"(\\d{3})(\\d{2}.\\d{4})," + // Longitude (DDDMM.MMMM)
"([EW])," +
"(\\d{2})(\\d{2}.\\d{4})," + // Latitude (DDMM.MMMM)
"([NS])," +
"([AV])," + // Validity
"(\\d{2})(\\d{2})(\\d{2})," + // Date (DDMMYY)
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"(\\d+)," + // Speed (km/h)
"(\\d+)," + // Course
"(\\d+)," + // Power
"(\\d+)," + // GPS signal
"(\\d+)," + // GSM signal
"(\\d+)," + // Alert Type
".*\\)");
/**
* Decode alert message
*/
private Position decodeAlertMessage(ChannelBuffer buf) throws Exception {
String message = buf.toString(Charset.defaultCharset());
// Parse message
Matcher parser = pattern.matcher(message);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
Integer index = 1;
// Get device by identifier
String id = parser.group(index++);
try {
position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + id);
return null;
}
// Longitude
Double lonlitude = Double.valueOf(parser.group(index++));
lonlitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) lonlitude = -lonlitude;
position.setLongitude(lonlitude);
// Latitude
Double latitude = Double.valueOf(parser.group(index++));
latitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("S") == 0) latitude = -latitude;
position.setLatitude(latitude);
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false);
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
time.set(Calendar.HOUR, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
position.setTime(time.getTime());
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
// Power
position.setPower(Double.valueOf(parser.group(index++)));
return position;
}
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
char first = (char) buf.getByte(0);
// Check message type
if (first == '$') {
return decodeNormalMessage(buf);
} else if (first == '(') {
return decodeAlertMessage(buf);
}
return null;
}
}
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