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/*
* Copyright 2015 - 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.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class BceProtocolDecoder extends BaseProtocolDecoder {
public BceProtocolDecoder(Protocol protocol) {
super(protocol);
}
private static final int DATA_TYPE = 7;
public static final int MSG_ASYNC_STACK = 0xA5;
public static final int MSG_STACK_COFIRM = 0x19;
public static final int MSG_TIME_TRIGGERED = 0xA0;
public static final int MSG_OUTPUT_CONTROL = 0x41;
public static final int MSG_OUTPUT_CONTROL_ACK = 0xC1;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
String imei = String.format("%015d", buf.readLongLE());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() > 1) {
int dataEnd = buf.readUnsignedShortLE() + buf.readerIndex();
int type = buf.readUnsignedByte();
if (type != MSG_ASYNC_STACK && type != MSG_TIME_TRIGGERED) {
return null;
}
int confirmKey = buf.readUnsignedByte() & 0x7F;
while (buf.readerIndex() < dataEnd) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int structEnd = buf.readUnsignedByte() + buf.readerIndex();
long time = buf.readUnsignedIntLE();
if ((time & 0x0f) == DATA_TYPE) {
time = time >> 4 << 1;
time += 0x47798280; // 01/01/2008
position.setTime(new Date(time * 1000));
// Read masks
int mask;
List<Integer> masks = new LinkedList<>();
do {
mask = buf.readUnsignedShortLE();
masks.add(mask);
} while (BitUtil.check(mask, 15));
mask = masks.get(0);
if (BitUtil.check(mask, 0)) {
position.setValid(true);
position.setLongitude(buf.readFloatLE());
position.setLatitude(buf.readFloatLE());
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
int status = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, BitUtil.to(status, 4));
position.set(Position.KEY_HDOP, BitUtil.from(status, 4));
position.setCourse(buf.readUnsignedByte() * 2);
position.setAltitude(buf.readUnsignedShortLE());
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
}
if (BitUtil.check(mask, 1)) {
position.set(Position.KEY_INPUT, buf.readUnsignedShortLE());
}
for (int i = 1; i <= 8; i++) {
if (BitUtil.check(mask, i + 1)) {
position.set(Position.PREFIX_ADC + i, buf.readUnsignedShortLE());
}
}
if (BitUtil.check(mask, 10)) {
buf.skipBytes(4);
}
if (BitUtil.check(mask, 11)) {
buf.skipBytes(4);
}
if (BitUtil.check(mask, 12)) {
buf.skipBytes(2);
}
if (BitUtil.check(mask, 13)) {
buf.skipBytes(2);
}
if (BitUtil.check(mask, 14)) {
position.setNetwork(new Network(CellTower.from(
buf.readUnsignedShortLE(), buf.readUnsignedByte(),
buf.readUnsignedShortLE(), buf.readUnsignedShortLE(),
buf.readUnsignedByte())));
buf.readUnsignedByte();
}
if (BitUtil.check(mask, 0)) {
positions.add(position);
}
}
buf.readerIndex(structEnd);
}
// Send response
if (type == MSG_ASYNC_STACK && channel != null) {
ByteBuf response = Unpooled.buffer(8 + 2 + 2 + 1);
response.writeLongLE(Long.parseLong(imei));
response.writeShortLE(2);
response.writeByte(MSG_STACK_COFIRM);
response.writeByte(confirmKey);
int checksum = 0;
for (int i = 0; i < response.writerIndex(); i++) {
checksum += response.getUnsignedByte(i);
}
response.writeByte(checksum);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
return positions;
}
}
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