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/*
* Copyright 2013 - 2018 Anton Tananaev (anton@traccar.org)
*
* 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 io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
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) {
ByteBuf request = Unpooled.buffer(8);
request.writeShortLE(type);
request.writeShortLE(0);
request.writeIntLE(Checksum.crc32(request.nioBuffer(0, 4)));
channel.writeAndFlush(new NetworkMessage(request, channel.remoteAddress()));
}
private void requestArchive(Channel channel) {
if (lastIndex == 0) {
lastIndex = newIndex;
} else if (newIndex > lastIndex) {
ByteBuf request = Unpooled.buffer(14);
request.writeShortLE(MSG_REQUEST_LOG_RECORDS);
request.writeShortLE(6);
request.writeIntLE((int) lastIndex);
request.writeShortLE(512);
request.writeIntLE(Checksum.crc32(request.nioBuffer(0, 10)));
channel.writeAndFlush(new NetworkMessage(request, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readUnsignedShortLE();
boolean alarm = (type & 0x8000) != 0;
type = type & 0x7FFF;
buf.readUnsignedShortLE(); // length
if (alarm) {
sendSimpleMessage(channel, MSG_ACK_ALARM);
}
if (type == MSG_TRACKER_ID) {
return null; // unsupported authentication type
}
if (type == MSG_TRACKER_ID_EXT) {
buf.readUnsignedIntLE(); // id
int length = buf.readUnsignedShortLE();
buf.skipBytes(length);
length = buf.readUnsignedShortLE();
getDeviceSession(channel, remoteAddress, buf.readSlice(length).toString(StandardCharsets.US_ASCII));
} else if (type == MSG_LAST_LOG_INDEX) {
long index = buf.readUnsignedIntLE();
if (index > 0) {
newIndex = index;
requestArchive(channel);
}
} else if (type == MSG_CURRENT_GPS_DATA || type == MSG_STATE_FULL_INFO_T104 || type == MSG_LOG_RECORDS) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
int recordCount = 1;
if (type == MSG_LOG_RECORDS) {
recordCount = buf.readUnsignedShortLE();
}
for (int j = 0; j < recordCount; j++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int subtype = type;
if (type == MSG_LOG_RECORDS) {
position.set(Position.KEY_ARCHIVE, true);
lastIndex = buf.readUnsignedIntLE() + 1;
position.set(Position.KEY_INDEX, lastIndex);
subtype = buf.readUnsignedShortLE();
if (subtype != MSG_CURRENT_GPS_DATA && subtype != MSG_STATE_FULL_INFO_T104) {
buf.skipBytes(buf.readUnsignedShortLE());
continue;
}
buf.readUnsignedShortLE(); // length
}
position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
position.setLatitude(buf.readIntLE() * 180.0 / 0x7FFFFFFF);
position.setLongitude(buf.readIntLE() * 180.0 / 0x7FFFFFFF);
if (subtype == MSG_STATE_FULL_INFO_T104) {
int speed = buf.readUnsignedByte();
position.setValid(speed != 255);
position.setSpeed(UnitsConverter.knotsFromKph(speed));
position.set(Position.KEY_HDOP, buf.readByte());
} else {
int speed = buf.readShortLE();
position.setValid(speed != -1);
position.setSpeed(UnitsConverter.knotsFromKph(speed * 0.01));
}
position.setCourse(buf.readShortLE() * 0.01);
position.setAltitude(buf.readShortLE());
if (subtype == MSG_STATE_FULL_INFO_T104) {
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
position.set(Position.KEY_EVENT, buf.readUnsignedShortLE());
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
position.set(Position.KEY_INPUT, buf.readUnsignedByte());
position.set(Position.KEY_OUTPUT, buf.readUnsignedByte());
for (int i = 1; i <= 8; i++) {
position.set(Position.PREFIX_ADC + i, buf.readUnsignedShortLE());
}
position.set(Position.PREFIX_COUNT + 1, buf.readUnsignedIntLE());
position.set(Position.PREFIX_COUNT + 2, buf.readUnsignedIntLE());
position.set(Position.PREFIX_COUNT + 3, buf.readUnsignedIntLE());
}
positions.add(position);
}
buf.readUnsignedIntLE(); // crc
if (type == MSG_LOG_RECORDS) {
requestArchive(channel);
} else {
sendSimpleMessage(channel, MSG_REQUEST_LAST_LOG_INDEX);
}
return positions;
}
return null;
}
}
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