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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.text.ParseException;
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.buffer.HeapChannelBufferFactory;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.GenericProtocolDecoder;
import org.traccar.helper.Crc;
import org.traccar.model.DataManager;
import org.traccar.model.Position;
/**
* Meiligao protocol decoder
*/
public class MeiligaoProtocolDecoder extends GenericProtocolDecoder {
/**
* Initialize
*/
public MeiligaoProtocolDecoder(DataManager dataManager, Integer resetDelay) {
super(dataManager, resetDelay);
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"([\\d]{2})([\\d]{2})([\\d]{2}).([\\d]{3})," + // Time (HHMMSS.SSS)
"([AV])," + // Validity
"([\\d]{2})([\\d]{2}.[\\d]{4})," + // Latitude (DDMM.MMMM)
"([NS])," +
"([\\d]{3})([\\d]{2}.[\\d]{4})," + // Longitude (DDDMM.MMMM)
"([EW])," +
"([\\d]+.[\\d]+)," + // Speed
"([\\d]+.[\\d]+)?," + // Course
"([\\d]{2})([\\d]{2})([\\d]{2})," + // Date (DDMMYY)
"[^\\|]+\\|(\\d+.\\d)\\|" + // Dilution of precision
"(\\d+)\\|" + // Altitude
"([0-9a-fA-F]+)\\|" + // State
".*"); // TODO: parse ADC
/**
* Parse device id
*/
private String getId(ChannelBuffer buf) {
String id = "";
for (int i = 0; i < 7; i++) {
int b = buf.getUnsignedByte(i);
// First digit
int d1 = (b & 0xf0) >> 4;
if (d1 == 0xf) break;
id += d1;
// Second digit
int d2 = (b & 0x0f);
if (d2 == 0xf) break;
id += d2;
}
return id;
}
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int command = buf.getUnsignedShort(7);
// Login confirmation
if (command == 0x5000) {
ChannelBuffer sendBuf = HeapChannelBufferFactory.getInstance().getBuffer(18);
sendBuf.writeByte('@');
sendBuf.writeByte('@');
sendBuf.writeShort(sendBuf.capacity());
byte[] array = new byte[7];
buf.getBytes(0, array);
sendBuf.writeBytes(array);
sendBuf.writeShort(0x4000);
sendBuf.writeByte(0x01);
array = new byte[sendBuf.readableBytes()];
sendBuf.getBytes(0, array);
sendBuf.writeShort(Crc.crc16Ccitt(array));
sendBuf.writeByte('\r');
sendBuf.writeByte('\n');
if (channel != null) {
channel.write(sendBuf);
}
}
// Data offset
int offset = 7 + 2;
if (command == 0x9955) {
offset += 0;
} else if (command == 0x9016) {
offset += 6;
} else if (command == 0x9999) {
offset += 1;
} else {
return null;
}
// Create new position
Position position = new Position();
StringBuilder extendedInfo = new StringBuilder("<protocol>meiligao</protocol>");
// Get device by id
// TODO: change imei to unique id
position.setDeviceId(getDataManager().getDeviceByImei(getId(buf)).getId());
// Parse message
String sentence = buf.toString(offset, buf.readableBytes() - offset - 4, Charset.defaultCharset());
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
throw new ParseException(null, 0);
}
Integer index = 1;
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
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++)));
time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)));
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false);
// 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);
// 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);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
String course = parser.group(index++);
if (course != null) {
position.setCourse(Double.valueOf(course));
} else {
position.setCourse(0.0);
}
// Date
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++)));
position.setTime(time.getTime());
// Dilution of precision
extendedInfo.append("<hdop>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</hdop>");
// Altitude
String altitude = parser.group(index++);
if (altitude != null) {
position.setAltitude(Double.valueOf(altitude));
} else {
position.setAltitude(0.0);
}
// State
extendedInfo.append("<state>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</state>");
// Extended info
position.setExtendedInfo(extendedInfo.toString());
return position;
}
}
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