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/*
* Copyright 2012 - 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.net.SocketAddress;
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.traccar.BaseProtocolDecoder;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class Jt600ProtocolDecoder extends BaseProtocolDecoder {
public Jt600ProtocolDecoder(Jt600Protocol protocol) {
super(protocol);
}
private Position decodeNormalMessage(ChannelBuffer buf, Channel channel) {
Position position = new Position();
position.setProtocol(getProtocolName());
buf.readByte(); // header
// Get device by identifier
String id = String.valueOf(Long.parseLong(ChannelBufferTools.readHexString(buf, 10)));
if (!identify(id, channel)) {
return null;
}
position.setDeviceId(getDeviceId());
// Protocol and type
int version = ChannelBufferTools.readHexInteger(buf, 1);
buf.readUnsignedByte(); // 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_OF_DAY, 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
position.setSpeed(ChannelBufferTools.readHexInteger(buf, 2));
// Course
position.setCourse(buf.readUnsignedByte() * 2.0);
if (version == 1) {
position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
// Power
position.set(Event.KEY_POWER, buf.readUnsignedByte());
buf.readByte(); // other flags and sensors
// Altitude
position.setAltitude(buf.readUnsignedShort());
position.set(Event.KEY_CELL, buf.readUnsignedShort());
position.set(Event.KEY_LAC, buf.readUnsignedShort());
position.set(Event.KEY_GSM, buf.readUnsignedByte());
} else if (version == 2) {
int fuel = buf.readUnsignedByte() << 8;
position.set(Event.KEY_STATUS, buf.readUnsignedInt());
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
fuel += buf.readUnsignedByte();
position.set(Event.KEY_FUEL, fuel);
}
return position;
}
private static final 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
".*\\)");
private Position decodeAlertMessage(ChannelBuffer buf, Channel channel) {
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();
position.setProtocol(getProtocolName());
position.set(Event.KEY_ALARM, true);
Integer index = 1;
// Get device by identifier
if (!identify(parser.group(index++), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
// Longitude
Double longitude = Double.parseDouble(parser.group(index++));
longitude += Double.parseDouble(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) longitude = -longitude;
position.setLongitude(longitude);
// Latitude
Double latitude = Double.parseDouble(parser.group(index++));
latitude += Double.parseDouble(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);
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.DAY_OF_MONTH, Integer.parseInt(parser.group(index++)));
time.set(Calendar.MONTH, Integer.parseInt(parser.group(index++)) - 1);
time.set(Calendar.YEAR, 2000 + Integer.parseInt(parser.group(index++)));
time.set(Calendar.HOUR_OF_DAY, Integer.parseInt(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.parseInt(parser.group(index++)));
time.set(Calendar.SECOND, Integer.parseInt(parser.group(index++)));
position.setTime(time.getTime());
// Speed
position.setSpeed(Double.parseDouble(parser.group(index++)));
// Course
position.setCourse(Double.parseDouble(parser.group(index++)));
// Power
position.set(Event.KEY_POWER, Double.parseDouble(parser.group(index++)));
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
char first = (char) buf.getByte(0);
// Check message type
if (first == '$') {
return decodeNormalMessage(buf, channel);
} else if (first == '(') {
return decodeAlertMessage(buf, channel);
}
return null;
}
}
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