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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.util.Calendar;
import java.util.TimeZone;
import java.nio.charset.Charset;
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.traccar.GenericProtocolDecoder;
import org.traccar.model.DataManager;
import org.traccar.model.Position;
/**
* Progress tracker protocol decoder
*/
public class ProgressProtocolDecoder extends GenericProtocolDecoder {
/**
* Device ID
*/
private long deviceId;
/**
* Initialize
*/
public ProgressProtocolDecoder(DataManager dataManager) {
super(dataManager);
}
/*
* Message types
*/
static final int MSG_NULL = 0;
static final int MSG_IDENT = 1;
static final int MSG_IDENT_FULL = 2;
static final int MSG_POINT = 10;
static final int MSG_LOG_SYNC = 100;
static final int MSG_LOGMSG = 101;
static final int MSG_TEXT = 102;
static final int MSG_ALARM = 200;
static final int MSG_ALARM_RECIEVED = 201;
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.readUnsignedShort();
int length = buf.readUnsignedShort();
// Authentication
if (type == MSG_IDENT || type == MSG_IDENT_FULL) {
long id = buf.readUnsignedInt();
length = buf.readUnsignedShort();
buf.skipBytes(length);
length = buf.readUnsignedShort();
String imei = buf.readBytes(length).toString(Charset.defaultCharset());
deviceId = getDataManager().getDeviceByImei(imei).getId();
}
// Position
else if (type == MSG_POINT || type == MSG_ALARM) {
Position position = new Position();
StringBuilder extendedInfo = new StringBuilder("<protocol>progress</protocol>");
position.setDeviceId(deviceId);
// Message index
buf.readUnsignedInt();
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.setTimeInMillis(buf.readUnsignedInt() * 1000);
position.setTime(time.getTime());
// Latitude
position.setLatitude(((double) buf.readInt()) / 0x7FFFFFFF * 180.0);
// Longitude
position.setLongitude(((double) buf.readInt()) / 0x7FFFFFFF * 180.0);
// Speed
position.setSpeed(((double) buf.readUnsignedInt()) / 100);
// Course
position.setCourse(((double) buf.readUnsignedShort()) / 100);
// Altitude
position.setAltitude(((double) buf.readUnsignedShort()) / 100);
// Satellites
int satellitesNumber = buf.readUnsignedByte();
extendedInfo.append("<sat>");
extendedInfo.append(satellitesNumber);
extendedInfo.append("</sat>");
position.setValid(satellitesNumber >= 3); // TODO: probably wrong
// Cell signal
extendedInfo.append("<gsm>");
extendedInfo.append(buf.readUnsignedByte());
extendedInfo.append("</gsm>");
// TODO: process other data
// Extended info
position.setExtendedInfo(extendedInfo.toString());
// Send response for alarm message
if (type == MSG_ALARM) {
byte[] response = {(byte)0xC9,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
channel.write(ChannelBuffers.wrappedBuffer(response));
extendedInfo.append("<alarm>true</alarm>");
}
return position;
}
return null;
}
}
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