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/*
* Copyright 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.nio.ByteOrder;
import java.nio.charset.Charset;
import java.util.Calendar;
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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.handler.codec.http.HttpVersion;
import org.traccar.BaseProtocolDecoder;
import org.traccar.ServerManager;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.Log;
import org.traccar.model.Position;
public class Mta6ProtocolDecoder extends BaseProtocolDecoder {
public Mta6ProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
private void sendContinue(Channel channel) {
HttpResponse response = new DefaultHttpResponse(
HttpVersion.HTTP_1_1, HttpResponseStatus.CONTINUE);
channel.write(response);
}
private void sendResponse(Channel channel, short packetId, short packetCount) {
HttpResponse response = new DefaultHttpResponse(
HttpVersion.HTTP_1_1, HttpResponseStatus.OK);
ChannelBuffer begin = ChannelBuffers.copiedBuffer("#ACK#", Charset.defaultCharset());
ChannelBuffer end = ChannelBuffers.directBuffer(3);
end.writeByte(packetId);
end.writeByte(packetCount);
end.writeByte(0);
response.setContent(ChannelBuffers.wrappedBuffer(begin, end));
channel.write(response);
}
private static boolean checkBit(long mask, int bit) {
long checkMask = 1 << bit;
return (mask & checkMask) == checkMask;
}
private List<Position> parseFormatA(ChannelBuffer buf, long deviceId) {
List<Position> positions = new LinkedList<Position>();
while (buf.readable()) {
Position position = new Position();
position.setDeviceId(deviceId);
StringBuilder extendedInfo = new StringBuilder("<protocol>mta6</protocol>");
short flags = buf.readUnsignedByte();
// Skip events
short event = buf.readUnsignedByte();
if (checkBit(event, 7)) {
if (checkBit(event, 6)) {
buf.skipBytes(8);
} else {
while (checkBit(event, 7)) {
event = buf.readUnsignedByte();
}
}
}
position.setLatitude((double) Float.intBitsToFloat(buf.readInt() << 2));
position.setLongitude((double) Float.intBitsToFloat(buf.readInt() << 2));
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.setTimeInMillis((buf.readUnsignedInt() << 2) * 1000);
position.setTime(time.getTime());
buf.readUnsignedShort(); // week
position.setExtendedInfo(extendedInfo.toString());
positions.add(position);
}
return positions;
}
private List<Position> parseFormatB(ChannelBuffer buf, long deviceId) {
return null;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
HttpRequest request = (HttpRequest) msg;
ChannelBuffer buf = request.getContent();
int length = buf.readableBytes();
// Read identifier
buf.skipBytes("id=".length());
int index = ChannelBufferTools.find(buf, buf.readerIndex(), length, "&");
String uniqueId = buf.toString(buf.readerIndex(), index - buf.readerIndex(), Charset.defaultCharset());
long deviceId = 0; // FIX FIX FIX
/*try {
deviceId = getDataManager().getDeviceByImei(uniqueId).getId();
} catch(Exception error) {
Log.warning("Unknown device - " + uniqueId);
return null;
}*/
buf.skipBytes(uniqueId.length());
buf.skipBytes("&bin=".length());
// Read header
short packetId = buf.readUnsignedByte();
buf.readUnsignedByte(); // dataOffset
short packetCount = buf.readUnsignedByte();
buf.readUnsignedByte(); // reserved
short parameters = buf.readUnsignedByte(); // TODO: handle timezone
// Send response
if (channel != null) {
sendContinue(channel);
sendResponse(channel, packetId, packetCount);
}
// Parse data
if (packetId == 0x31 || packetId == 0x32 || packetId == 0x36) {
return parseFormatA(buf, deviceId);
} else if (packetId == 0x34) {
return parseFormatB(buf, deviceId);
} //else if (0x38 0x4F 0x59)
/*String sentence = (String) msg;
// Detect device ID
if (sentence.contains("$PGID")) {
String imei = sentence.substring(6, sentence.length() - 3);
try {
deviceId = getDataManager().getDeviceByImei(imei).getId();
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
}
}
// Parse message
else if (sentence.contains("$GPRMC") && deviceId != null) {
// Send response
if (channel != null) {
channel.write("OK1\r\n");
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setDeviceId(deviceId);
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++)));
index += 1; // Skip milliseconds
// 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
String speed = parser.group(index++);
if (speed != null) {
position.setSpeed(Double.valueOf(speed));
} else {
position.setSpeed(0.0);
}
// 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());
// Altitude
position.setAltitude(0.0);
return position;
}*/
return null;
}
}
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