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/*
* Copyright 2012 - 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.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
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 ProgressProtocolDecoder extends BaseProtocolDecoder {
private long lastIndex;
private long newIndex;
public ProgressProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_NULL = 0;
public static final int MSG_IDENT = 1;
public static final int MSG_IDENT_FULL = 2;
public static final int MSG_POINT = 10;
public static final int MSG_LOG_SYNC = 100;
public static final int MSG_LOGMSG = 101;
public static final int MSG_TEXT = 102;
public static final int MSG_ALARM = 200;
public static final int MSG_ALARM_RECIEVED = 201;
private void requestArchive(Channel channel) {
if (lastIndex == 0) {
lastIndex = newIndex;
} else if (newIndex > lastIndex) {
ByteBuf request = Unpooled.buffer(12);
request.writeShortLE(MSG_LOG_SYNC);
request.writeShortLE(4);
request.writeIntLE((int) lastIndex);
request.writeIntLE(0);
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();
buf.readUnsignedShortLE(); // length
if (type == MSG_IDENT || type == MSG_IDENT_FULL) {
buf.readUnsignedIntLE(); // id
int length = buf.readUnsignedShortLE();
buf.skipBytes(length);
length = buf.readUnsignedShortLE();
buf.skipBytes(length);
length = buf.readUnsignedShortLE();
String imei = buf.readSlice(length).toString(StandardCharsets.US_ASCII);
getDeviceSession(channel, remoteAddress, imei);
} else if (type == MSG_POINT || type == MSG_ALARM || type == MSG_LOGMSG) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
int recordCount = 1;
if (type == MSG_LOGMSG) {
recordCount = buf.readUnsignedShortLE();
}
for (int j = 0; j < recordCount; j++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
if (type == MSG_LOGMSG) {
position.set(Position.KEY_ARCHIVE, true);
int subtype = buf.readUnsignedShortLE();
if (subtype == MSG_ALARM) {
position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
}
if (buf.readUnsignedShortLE() > buf.readableBytes()) {
lastIndex += 1;
break; // workaround for device bug
}
lastIndex = buf.readUnsignedIntLE();
position.set(Position.KEY_INDEX, lastIndex);
} else {
newIndex = buf.readUnsignedIntLE();
}
position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
position.setLatitude(buf.readIntLE() * 180.0 / 0x7FFFFFFF);
position.setLongitude(buf.readIntLE() * 180.0 / 0x7FFFFFFF);
position.setSpeed(buf.readUnsignedIntLE() * 0.01);
position.setCourse(buf.readUnsignedShortLE() * 0.01);
position.setAltitude(buf.readUnsignedShortLE() * 0.01);
int satellites = buf.readUnsignedByte();
position.setValid(satellites >= 3);
position.set(Position.KEY_SATELLITES, satellites);
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
long extraFlags = buf.readLongLE();
if (BitUtil.check(extraFlags, 0)) {
int count = buf.readUnsignedShortLE();
for (int i = 1; i <= count; i++) {
position.set(Position.PREFIX_ADC + i, buf.readUnsignedShortLE());
}
}
if (BitUtil.check(extraFlags, 1)) {
int size = buf.readUnsignedShortLE();
position.set("can", buf.toString(buf.readerIndex(), size, StandardCharsets.US_ASCII));
buf.skipBytes(size);
}
if (BitUtil.check(extraFlags, 2)) {
position.set("passenger", ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedShortLE())));
}
if (type == MSG_ALARM) {
position.set(Position.KEY_ALARM, true);
byte[] response = {(byte) 0xC9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(response), remoteAddress));
}
buf.readUnsignedIntLE(); // crc
positions.add(position);
}
requestArchive(channel);
return positions;
}
return null;
}
}
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