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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.ByteOrder;
import java.nio.charset.Charset;
import java.net.SocketAddress;
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class ProgressProtocolDecoder extends BaseProtocolDecoder {
private long lastIndex;
private long newIndex;
public ProgressProtocolDecoder(ProgressProtocol protocol) {
super(protocol);
}
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";
private void requestArchive(Channel channel) {
if (lastIndex == 0) {
lastIndex = newIndex;
} else if (newIndex > lastIndex) {
ChannelBuffer request = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 12);
request.writeShort(MSG_LOG_SYNC);
request.writeShort(4);
request.writeInt((int) lastIndex);
request.writeInt(0);
channel.write(request);
}
}
@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.readUnsignedShort();
buf.readUnsignedShort(); // length
// Authentication
if (type == MSG_IDENT || type == MSG_IDENT_FULL) {
long id = buf.readUnsignedInt();
int length = buf.readUnsignedShort();
buf.skipBytes(length);
length = buf.readUnsignedShort();
buf.skipBytes(length);
length = buf.readUnsignedShort();
String imei = buf.readBytes(length).toString(Charset.defaultCharset());
identify(imei, channel);
}
// Position
else if (hasDeviceId() && (type == MSG_POINT || type == MSG_ALARM || type == MSG_LOGMSG)) {
List<Position> positions = new LinkedList<>();
int recordCount = 1;
if (type == MSG_LOGMSG) {
recordCount = buf.readUnsignedShort();
}
for (int j = 0; j < recordCount; j++) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
// Message index
if (type == MSG_LOGMSG) {
position.set(Event.KEY_ARCHIVE, true);
int subtype = buf.readUnsignedShort();
if (subtype == MSG_ALARM) {
position.set(Event.KEY_ALARM, true);
}
if (buf.readUnsignedShort() > buf.readableBytes()) {
lastIndex += 1;
break; // workaround for device bug
}
lastIndex = buf.readUnsignedInt();
position.set(Event.KEY_INDEX, lastIndex);
} else {
newIndex = buf.readUnsignedInt();
}
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.setTimeInMillis(buf.readUnsignedInt() * 1000);
position.setTime(time.getTime());
// Latitude
position.setLatitude(buf.readInt() * 180.0 / 0x7FFFFFFF);
// Longitude
position.setLongitude(buf.readInt() * 180.0 / 0x7FFFFFFF);
// Speed
position.setSpeed(buf.readUnsignedInt() / 100);
// Course
position.setCourse(buf.readUnsignedShort() / 100);
// Altitude
position.setAltitude(buf.readUnsignedShort() / 100);
// Satellites
int satellitesNumber = buf.readUnsignedByte();
position.set(Event.KEY_SATELLITES, satellitesNumber);
// Validity
position.setValid(satellitesNumber >= 3); // TODO: probably wrong
// Cell signal
position.set(Event.KEY_GSM, buf.readUnsignedByte());
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
long extraFlags = buf.readLong();
// Analog inputs
if ((extraFlags & 0x1) == 0x1) {
int count = buf.readUnsignedShort();
for (int i = 1; i <= count; i++) {
position.set(Event.PREFIX_ADC + i, buf.readUnsignedShort());
}
}
// CAN adapter
if ((extraFlags & 0x2) == 0x2) {
int size = buf.readUnsignedShort();
position.set("can", buf.toString(buf.readerIndex(), size, Charset.defaultCharset()));
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)));
}
position.set("passenger", hex.toString());
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));
position.set(Event.KEY_ALARM, true);
}
// Skip CRC
buf.readUnsignedInt();
positions.add(position);
}
requestArchive(channel);
return positions;
}
return null;
}
}
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