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/*
* Copyright 2019 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.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import org.traccar.model.WifiAccessPoint;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class Minifinder2ProtocolDecoder extends BaseProtocolDecoder {
public Minifinder2ProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_DATA = 0x01;
public static final int MSG_RESPONSE = 0x7F;
private String decodeAlarm(int code) {
if (BitUtil.check(code, 0)) {
return Position.ALARM_LOW_BATTERY;
}
if (BitUtil.check(code, 1)) {
return Position.ALARM_OVERSPEED;
}
if (BitUtil.check(code, 2)) {
return Position.ALARM_FALL_DOWN;
}
if (BitUtil.check(code, 8)) {
return Position.ALARM_POWER_OFF;
}
if (BitUtil.check(code, 9)) {
return Position.ALARM_POWER_ON;
}
if (BitUtil.check(code, 12)) {
return Position.ALARM_SOS;
}
return null;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
int flags = buf.readUnsignedByte();
buf.readUnsignedShortLE(); // length
buf.readUnsignedShortLE(); // checksum
int index = buf.readUnsignedShortLE();
int type = buf.readUnsignedByte();
if (BitUtil.check(flags, 4) && channel != null) {
ByteBuf content = Unpooled.buffer();
content.writeByte(MSG_RESPONSE);
content.writeByte(1); // key length
content.writeByte(0); // success
ByteBuf response = Unpooled.buffer();
response.writeByte(0xAB); // header
response.writeByte(0x00); // properties
response.writeShortLE(content.readableBytes());
response.writeShortLE(Checksum.crc16(Checksum.CRC16_XMODEM, content.nioBuffer()));
response.writeShortLE(index);
response.writeBytes(content);
content.release();
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
if (type == MSG_DATA) {
Position position = new Position(getProtocolName());
while (buf.isReadable()) {
int endIndex = buf.readUnsignedByte() + buf.readerIndex();
int key = buf.readUnsignedByte();
switch (key) {
case 0x01:
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, buf.readCharSequence(15, StandardCharsets.US_ASCII).toString());
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
break;
case 0x02:
position.set(Position.KEY_ALARM, decodeAlarm(buf.readIntLE()));
break;
case 0x20:
position.setLatitude(buf.readIntLE() * 0.0000001);
position.setLongitude(buf.readIntLE() * 0.0000001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShortLE()));
position.setCourse(buf.readUnsignedShortLE());
position.setAltitude(buf.readShortLE());
position.setValid(buf.readUnsignedShortLE() > 0);
position.set(Position.KEY_ODOMETER, buf.readUnsignedIntLE());
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
break;
case 0x21:
int mcc = buf.readUnsignedShortLE();
int mnc = buf.readUnsignedByte();
if (position.getNetwork() == null) {
position.setNetwork(new Network());
}
while (buf.readerIndex() < endIndex) {
int rssi = buf.readByte();
position.getNetwork().addCellTower(CellTower.from(
mcc, mnc, buf.readUnsignedShortLE(), buf.readUnsignedShortLE(), rssi));
}
break;
case 0x22:
if (position.getNetwork() == null) {
position.setNetwork(new Network());
}
while (buf.readerIndex() < endIndex) {
int rssi = buf.readByte();
String mac = ByteBufUtil.hexDump(buf.readSlice(6)).replaceAll("(..)", "$1:");
position.getNetwork().addWifiAccessPoint(WifiAccessPoint.from(
mac.substring(0, mac.length() - 1), rssi));
}
break;
case 0x24:
position.setTime(new Date(buf.readUnsignedIntLE() * 1000));
position.set(Position.KEY_STATUS, buf.readUnsignedIntLE());
break;
case 0x40:
buf.readUnsignedIntLE(); // timestamp
int heartRate = buf.readUnsignedByte();
if (heartRate > 1) {
position.set(Position.KEY_HEART_RATE, heartRate);
}
break;
default:
break;
}
buf.readerIndex(endIndex);
}
if (!position.getAttributes().containsKey(Position.KEY_SATELLITES)) {
getLastLocation(position, null);
}
return position.getDeviceId() > 0 ? position : null;
}
return null;
}
}
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