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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.util.Calendar;
import java.util.TimeZone;
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.BaseProtocolDecoder;
import org.traccar.ServerManager;
import org.traccar.helper.Log;
import org.traccar.model.Position;
/**
* Progress tracker protocol decoder
*/
public class ProgressProtocolDecoder extends BaseProtocolDecoder {
/**
* Device ID
*/
private long deviceId;
/**
* Initialize
*/
public ProgressProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
/*
* Message types
*/
private static final int MSG_NULL = 0;
private static final int MSG_IDENT = 1;
private static final int MSG_IDENT_FULL = 2;
private static final int MSG_POINT = 10;
private static final int MSG_LOG_SYNC = 100;
private static final int MSG_LOGMSG = 101;
private static final int MSG_TEXT = 102;
private static final int MSG_ALARM = 200;
private static final int MSG_ALARM_RECIEVED = 201;
private static final String HEX_CHARS = "0123456789ABCDEF";
/**
* Decode message
*/
@Override
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();
buf.skipBytes(length);
length = buf.readUnsignedShort();
String imei = buf.readBytes(length).toString(Charset.defaultCharset());
try {
deviceId = getDataManager().getDeviceByImei(imei).getId();
} catch(Exception error) {
Log.warning("Unknown device - " + imei + " (id - " + id + ")");
}
}
// Position
else if (deviceId != 0 && (type == MSG_POINT || type == MSG_ALARM)) {
Position position = new Position();
StringBuilder extendedInfo = new StringBuilder("<protocol>progress</protocol>");
position.setDeviceId(deviceId);
// Message index
position.setId(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("<satellites>");
extendedInfo.append(satellitesNumber);
extendedInfo.append("</satellites>");
// Validity
position.setValid(satellitesNumber >= 3); // TODO: probably wrong
// Cell signal
extendedInfo.append("<gsm>");
extendedInfo.append(buf.readUnsignedByte());
extendedInfo.append("</gsm>");
// Milage
extendedInfo.append("<milage>");
extendedInfo.append(buf.readUnsignedInt());
extendedInfo.append("</milage>");
long extraFlags = buf.readLong();
// Analog inputs
if ((extraFlags & 0x1) == 0x1) {
int count = buf.readUnsignedShort();
for (int i = 1; i <= count; i++) {
extendedInfo.append("<adc").append(i).append(">");
extendedInfo.append(buf.readUnsignedShort());
extendedInfo.append("</adc").append(i).append(">");
}
}
// CAN adapter
if ((extraFlags & 0x2) == 0x2) {
int size = buf.readUnsignedShort();
extendedInfo.append("<can>");
extendedInfo.append(buf.toString(buf.readerIndex(), size, Charset.defaultCharset()));
extendedInfo.append("</can>");
buf.skipBytes(size);
}
// Passenger sensor
if ((extraFlags & 0x4) == 0x4) {
int size = buf.readUnsignedShort();
// Convert binary data to hex
StringBuilder hex = new StringBuilder();
for (int i = buf.readerIndex(); i < buf.readerIndex() + size; i++) {
byte b = buf.getByte(i);
hex.append(HEX_CHARS.charAt((b & 0xf0) >> 4));
hex.append(HEX_CHARS.charAt((b & 0x0F)));
}
extendedInfo.append("<passenger>");
extendedInfo.append(hex);
extendedInfo.append("</passenger>");
buf.skipBytes(size);
}
// 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>");
}
// Extended info
position.setExtendedInfo(extendedInfo.toString());
return position;
}
return null;
}
}
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