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/*
* Copyright 2019 - 2020 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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class BlueProtocolDecoder extends BaseProtocolDecoder {
public BlueProtocolDecoder(Protocol protocol) {
super(protocol);
}
private double readCoordinate(ByteBuf buf, boolean negative) {
int value = buf.readUnsignedShort();
int degrees = value / 100;
double minutes = value % 100 + buf.readUnsignedShort() * 0.0001;
double coordinate = degrees + minutes / 60;
return negative ? -coordinate : coordinate;
}
private void sendResponse(Channel channel, int deviceIndex) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0xaa);
response.writeShort(2 + 1 + 1 + 6 + 1);
response.writeByte(0x86); // version
response.writeByte(0);
response.writeByte(6); // data length
response.writeByte(0xa4); // type
response.writeByte(0); // server index
response.writeByte(deviceIndex);
response.writeByte(0);
response.writeByte(0);
response.writeByte(Checksum.xor(response.nioBuffer(1, response.writerIndex() - 1)));
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private String decodeAlarm(int value) {
return switch (value) {
case 1 -> Position.ALARM_SOS;
case 8 -> Position.ALARM_OVERSPEED;
case 19 -> Position.ALARM_LOW_POWER;
default -> null;
};
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
buf.readUnsignedShort(); // length
buf.readUnsignedByte(); // version
buf.readUnsignedByte();
String id = String.valueOf(buf.readUnsignedInt());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
while (buf.readableBytes() > 1) {
int frameEnd = buf.readerIndex() + buf.readUnsignedByte();
int type = buf.readUnsignedByte();
int index = buf.readUnsignedByte();
buf.readUnsignedByte();
buf.readUnsignedByte(); // flags
if (type == 0x01) {
buf.readUnsignedByte(); // reserved
int flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 7));
position.setLatitude(readCoordinate(buf, BitUtil.check(flags, 6)));
position.setLongitude(readCoordinate(buf, BitUtil.check(flags, 5)));
position.setSpeed(buf.readUnsignedShort() + buf.readUnsignedShort() * 0.001);
position.setCourse(buf.readUnsignedShort() + buf.readUnsignedByte() * 0.01);
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
buf.readUnsignedShort(); // lac
buf.readUnsignedShort(); // cid
} else if (type == 0x12) {
int status;
status = buf.readUnsignedByte(); // status 1
position.set(Position.KEY_ALARM, BitUtil.check(status, 1) ? Position.ALARM_VIBRATION : null);
buf.readUnsignedByte(); // status 2
buf.readUnsignedByte(); // status 3
status = buf.readUnsignedByte(); // status 4
int ignition = BitUtil.between(status, 2, 4);
if (ignition == 0b01) {
position.set(Position.KEY_IGNITION, false);
}
if (ignition == 0b10) {
position.set(Position.KEY_IGNITION, true);
}
buf.readUnsignedByte(); // status 5
buf.readUnsignedByte(); // status 6
position.set(Position.KEY_STATUS, buf.readUnsignedShort());
} else if (type == 0x81) {
position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));
} else if (type == 0x84) {
sendResponse(channel, index);
}
buf.readerIndex(frameEnd);
}
return position.getFixTime() != null ? position : null;
}
}
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