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/*
* Copyright 2013 - 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.net.SocketAddress;
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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.Log;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class ApelProtocolDecoder extends BaseProtocolDecoder {
private long lastIndex;
private long newIndex;
public ApelProtocolDecoder(ApelProtocol protocol) {
super(protocol);
}
public static final short MSG_NULL = 0;
public static final short MSG_REQUEST_TRACKER_ID = 10;
public static final short MSG_TRACKER_ID = 11;
public static final short MSG_TRACKER_ID_EXT = 12;
public static final short MSG_DISCONNECT = 20;
public static final short MSG_REQUEST_PASSWORD = 30;
public static final short MSG_PASSWORD = 31;
public static final short MSG_REQUEST_STATE_FULL_INFO = 90;
public static final short MSG_STATE_FULL_INFO_T104 = 92;
public static final short MSG_REQUEST_CURRENT_GPS_DATA = 100;
public static final short MSG_CURRENT_GPS_DATA = 101;
public static final short MSG_REQUEST_SENSORS_STATE = 110;
public static final short MSG_SENSORS_STATE = 111;
public static final short MSG_SENSORS_STATE_T100 = 112;
public static final short MSG_SENSORS_STATE_T100_4 = 113;
public static final short MSG_REQUEST_LAST_LOG_INDEX = 120;
public static final short MSG_LAST_LOG_INDEX = 121;
public static final short MSG_REQUEST_LOG_RECORDS = 130;
public static final short MSG_LOG_RECORDS = 131;
public static final short MSG_EVENT = 141;
public static final short MSG_TEXT = 150;
public static final short MSG_ACK_ALARM = 160;
public static final short MSG_SET_TRACKER_MODE = 170;
public static final short MSG_GPRS_COMMAND = 180;
private void sendSimpleMessage(Channel channel, short type) {
ChannelBuffer request = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 8);
request.writeShort(type);
request.writeShort(0);
request.writeInt(Checksum.crc32(request.toByteBuffer(0, 4)));
channel.write(request);
}
private void requestArchive(Channel channel) {
if (lastIndex == 0) {
lastIndex = newIndex;
} else if (newIndex > lastIndex) {
ChannelBuffer request = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 14);
request.writeShort(MSG_REQUEST_LOG_RECORDS);
request.writeShort(6);
request.writeInt((int) lastIndex);
request.writeShort(512);
request.writeInt(Checksum.crc32(request.toByteBuffer(0, 10)));
channel.write(request);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.readUnsignedShort();
boolean alarm = (type & 0x8000) != 0;
type = type & 0x7FFF;
buf.readUnsignedShort(); // length
if (alarm) {
sendSimpleMessage(channel, MSG_ACK_ALARM);
}
if (type == MSG_TRACKER_ID) {
Log.warning("Unsupported authentication type");
return null;
}
if (type == MSG_TRACKER_ID_EXT) {
buf.readUnsignedInt(); // id
int length = buf.readUnsignedShort();
buf.skipBytes(length);
length = buf.readUnsignedShort();
identify(buf.readBytes(length).toString(Charset.defaultCharset()), channel);
} else if (type == MSG_LAST_LOG_INDEX) {
long index = buf.readUnsignedInt();
if (index > 0) {
newIndex = index;
requestArchive(channel);
}
} else if (hasDeviceId()
&& (type == MSG_CURRENT_GPS_DATA || type == MSG_STATE_FULL_INFO_T104 || type == MSG_LOG_RECORDS)) {
List<Position> positions = new LinkedList<>();
int recordCount = 1;
if (type == MSG_LOG_RECORDS) {
recordCount = buf.readUnsignedShort();
}
for (int j = 0; j < recordCount; j++) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
// Message index
int subtype = type;
if (type == MSG_LOG_RECORDS) {
position.set(Event.KEY_ARCHIVE, true);
lastIndex = buf.readUnsignedInt() + 1;
position.set(Event.KEY_INDEX, lastIndex);
subtype = buf.readUnsignedShort();
if (subtype != MSG_CURRENT_GPS_DATA && subtype != MSG_STATE_FULL_INFO_T104) {
buf.skipBytes(buf.readUnsignedShort());
continue;
}
buf.readUnsignedShort(); // length
}
// 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 and Validity
if (subtype == MSG_STATE_FULL_INFO_T104) {
int speed = buf.readUnsignedByte();
position.setValid(speed != 255);
position.setSpeed(UnitsConverter.knotsFromKph(speed));
position.set(Event.KEY_HDOP, buf.readByte());
} else {
int speed = buf.readShort();
position.setValid(speed != -1);
position.setSpeed(UnitsConverter.knotsFromKph(speed / 100.0));
}
// Course
position.setCourse(buf.readShort() / 100.0);
// Altitude
position.setAltitude(buf.readShort());
if (subtype == MSG_STATE_FULL_INFO_T104) {
// Satellites
position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
// Cell signal
position.set(Event.KEY_GSM, buf.readUnsignedByte());
// Event type
position.set(Event.KEY_EVENT, buf.readUnsignedShort());
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
// Input/Output
position.set(Event.KEY_INPUT, buf.readUnsignedByte());
position.set(Event.KEY_OUTPUT, buf.readUnsignedByte());
// Analog sensors
for (int i = 1; i <= 8; i++) {
position.set(Event.PREFIX_ADC + i, buf.readUnsignedShort());
}
// Counters
position.set(Event.PREFIX_COUNT + 1, buf.readUnsignedInt());
position.set(Event.PREFIX_COUNT + 2, buf.readUnsignedInt());
position.set(Event.PREFIX_COUNT + 3, buf.readUnsignedInt());
}
positions.add(position);
}
// Skip CRC
buf.readUnsignedInt();
if (type == MSG_LOG_RECORDS) {
requestArchive(channel);
} else {
sendSimpleMessage(channel, MSG_REQUEST_LAST_LOG_INDEX);
}
return positions;
}
return null;
}
}
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