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/*
* Copyright 2012 - 2014 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.Date;
import java.util.LinkedList;
import java.util.List;
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.Crc;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class MeitrackProtocolDecoder extends BaseProtocolDecoder {
public MeitrackProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
private static final Pattern pattern = Pattern.compile(
"\\$\\$." + // Flag
"\\d+," + // Length
"(\\d+)," + // IMEI
"\\p{XDigit}{3}," + // Command
"(\\d+)," + // Event
"(-?\\d+\\.\\d+)," + // Latitude
"(-?\\d+\\.\\d+)," + // Longitude
"(\\d{2})(\\d{2})(\\d{2})" + // Date (YYMMDD)
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"([AV])," + // Validity
"(\\d+)," + // Satellites
"(\\d+)," + // GSM Signal
"(\\d+)," + // Speed
"(\\d+)," + // Course
"(\\d+\\.?\\d*)," + // HDOP
"(-?\\d+)," + // Altitude
"(\\d+)," + // Milage
"(\\d+)," + // Runtime
"(\\d+\\|\\d+\\|\\p{XDigit}+\\|\\p{XDigit}+)," + // Cell
"(\\p{XDigit}+)," + // State
"(\\p{XDigit}+)\\|" + // ADC1
"(\\p{XDigit}+)\\|" + // ADC2
"(\\p{XDigit}+)?\\|" + // ADC3
"(\\p{XDigit}+)\\|" + // Battery
"(\\p{XDigit}+)," + // Power
".*(\r\n)?");
private Position decodeRegularMessage(Channel channel, ChannelBuffer buf) {
// Parse message
String sentence = buf.toString(Charset.defaultCharset());
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("meitrack");
Integer index = 1;
// Identification
String imei = parser.group(index++);
try {
position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
return null;
}
// Event
extendedInfo.set("event", parser.group(index++));
// Coordinates
position.setLatitude(Double.valueOf(parser.group(index++)));
position.setLongitude(Double.valueOf(parser.group(index++)));
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
time.set(Calendar.HOUR_OF_DAY, 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());
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0);
// Satellites
extendedInfo.set("satellites", parser.group(index++));
// GSM Signal
extendedInfo.set("gsm", parser.group(index++));
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)) * 0.539957);
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
// HDOP
extendedInfo.set("hdop", parser.group(index++));
// Altitude
position.setAltitude(Double.valueOf(parser.group(index++)));
// Other
extendedInfo.set("milage", parser.group(index++));
extendedInfo.set("runtime", parser.group(index++));
extendedInfo.set("cell", parser.group(index++));
extendedInfo.set("state", parser.group(index++));
// ADC
extendedInfo.set("adc1", Integer.parseInt(parser.group(index++), 16));
extendedInfo.set("adc2", Integer.parseInt(parser.group(index++), 16));
String adc3 = parser.group(index++);
if (adc3 != null) {
extendedInfo.set("adc3", Integer.parseInt(adc3, 16));
}
extendedInfo.set("battery", Integer.parseInt(parser.group(index++), 16));
extendedInfo.set("power", Integer.parseInt(parser.group(index++), 16));
// Extended info
position.setExtendedInfo(extendedInfo.toString());
return position;
}
private List<Position> decodeBinaryMessage(Channel channel, ChannelBuffer buf) {
List<Position> positions = new LinkedList<Position>();
Integer index = ChannelBufferTools.find(buf, 0, buf.readableBytes(), ",");
// Identification
long deviceId;
String imei = buf.toString(index + 1, 15, Charset.defaultCharset());
try {
deviceId = getDataManager().getDeviceByImei(imei).getId();
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
return null;
}
buf.skipBytes(index + 1 + 15 + 1 + 3 + 1 + 2 + 2 + 4);
while (buf.readableBytes() >= 0x34) {
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("meitrack");
position.setDeviceId(deviceId);
// Event
extendedInfo.set("event", buf.readUnsignedByte());
// Location
position.setLatitude(buf.readInt() * 0.000001);
position.setLongitude(buf.readInt() * 0.000001);
// Time (946684800 - timestamp for 2000-01-01)
position.setTime(new Date((946684800 + buf.readUnsignedInt()) * 1000));
// Validity
position.setValid(buf.readUnsignedByte() == 1);
// Satellites
extendedInfo.set("satellites", buf.readUnsignedByte());
// GSM Signal
extendedInfo.set("gsm", buf.readUnsignedByte());
// Speed
position.setSpeed(buf.readUnsignedShort() * 0.539957);
// Course
position.setCourse((double) buf.readUnsignedShort());
// HDOP
extendedInfo.set("hdop", buf.readUnsignedShort() * 0.1);
// Altitude
position.setAltitude((double) buf.readUnsignedShort());
// Other
extendedInfo.set("milage", buf.readUnsignedInt());
extendedInfo.set("runtime", buf.readUnsignedInt());
extendedInfo.set("cell",
buf.readUnsignedShort() + "|" + buf.readUnsignedShort() + "|" +
buf.readUnsignedShort() + "|" + buf.readUnsignedShort());
extendedInfo.set("state", buf.readUnsignedShort());
// ADC
extendedInfo.set("adc1", buf.readUnsignedShort());
extendedInfo.set("battery", buf.readUnsignedShort() * 0.01);
extendedInfo.set("power", buf.readUnsignedShort());
buf.readUnsignedInt(); // geo-fence
position.setExtendedInfo(extendedInfo.toString());
positions.add(position);
}
// Delete recorded data
if (channel != null) {
StringBuilder command = new StringBuilder("@@W28,");
command.append(imei).append(",CCC,").append(positions.size()).append("*");
int checksum = 0;
for (int i = 0; i < command.length(); i += 1) checksum += command.charAt(i);
command.append(String.format("%02x\r\n", checksum & 0xff).toUpperCase());
channel.write(command.toString());
}
return positions;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Find type
Integer index = ChannelBufferTools.find(buf, 0, buf.readableBytes(), ",");
index = ChannelBufferTools.find(buf, index + 1, buf.readableBytes(), ",");
String type = buf.toString(index + 1, 3, Charset.defaultCharset());
if (type.equals("CCC")) {
return decodeBinaryMessage(channel, buf);
} else {
return decodeRegularMessage(channel, buf);
}
}
}
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