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/*
* Copyright 2021 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.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
public class FlexibleReportProtocolDecoder extends BaseProtocolDecoder {
public FlexibleReportProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_GENERAL = 0x00;
private void sendResponse(Channel channel, SocketAddress remoteAddress, int index) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(0x7E); // header
response.writeShort(2); // length
response.writeByte(0xE0);
response.writeByte(BitUtil.check(index, 0) ? 0x4F : 0x0F);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
private Date decodeTime(ByteBuf buf) {
int timestamp = buf.readInt();
return new DateBuilder()
.setSecond(timestamp % 60)
.setMinute((timestamp / 60) % 60)
.setHour((timestamp / (60 * 60)) % 24)
.setDay(1 + timestamp / (60 * 60 * 24) % 31)
.setMonth(1 + timestamp / (60 * 60 * 24 * 31) % 12)
.setYear(2000 + timestamp / (60 * 60 * 24 * 31 * 12))
.getDate();
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.readUnsignedByte(); // header
int flags = buf.readUnsignedByte();
String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
int index = buf.readUnsignedShort();
if (BitUtil.to(flags, 2) > 0) {
sendResponse(channel, remoteAddress, index);
}
Date time = decodeTime(buf);
int event = buf.readUnsignedByte();
buf.readUnsignedByte(); // length
int type = buf.readUnsignedByte();
if (type == MSG_GENERAL) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setDeviceTime(time);
position.set(Position.KEY_EVENT, event);
buf.readUnsignedByte(); // length
long mask = buf.readUnsignedInt();
if (BitUtil.check(mask, 0)) {
buf.readUnsignedByte(); // product id
}
if (BitUtil.check(mask, 1)) {
position.setFixTime(decodeTime(buf));
}
if (BitUtil.check(mask, 2)) {
position.setValid(true);
position.setLatitude(buf.readUnsignedInt() / 1000000.0 - 90);
position.setLongitude(buf.readUnsignedInt() / 1000000.0 - 180);
}
if (BitUtil.check(mask, 3)) {
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedShort());
}
if (BitUtil.check(mask, 4)) {
position.setAltitude(buf.readShort());
}
if (BitUtil.check(mask, 5)) {
buf.readUnsignedShort(); // gps accuracy
}
if (BitUtil.check(mask, 6)) {
position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001);
}
if (BitUtil.check(mask, 7)) {
position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.001);
}
if (BitUtil.check(mask, 8)) {
position.set("auxPower", buf.readUnsignedShort() * 0.001);
}
if (BitUtil.check(mask, 9)) {
position.set("solarPower", buf.readUnsignedShort() * 0.001);
}
if (BitUtil.check(mask, 10)) {
int cellService = buf.readUnsignedByte();
position.set(Position.KEY_ROAMING, BitUtil.check(cellService, 7));
position.set("service", BitUtil.to(cellService, 7));
buf.skipBytes(4); // cell info
}
if (BitUtil.check(mask, 11)) {
buf.readUnsignedByte(); // rssi
}
if (BitUtil.check(mask, 12)) {
int inputs = buf.readUnsignedByte();
position.set(Position.KEY_IGNITION, BitUtil.check(inputs, 0));
position.set(Position.PREFIX_IO + 1, inputs);
}
if (BitUtil.check(mask, 13)) {
position.set(Position.PREFIX_IO + 2, buf.readUnsignedByte());
}
if (BitUtil.check(mask, 14)) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
}
if (BitUtil.check(mask, 15)) {
position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedShort() * 0.01);
}
return position;
}
return null;
}
}
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