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/*
* Copyright 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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.Date;
public class ContinentalProtocolDecoder extends BaseProtocolDecoder {
public ContinentalProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_KEEPALIVE = 0x00;
public static final int MSG_STATUS = 0x02;
public static final int MSG_ACK = 0x06;
public static final int MSG_NACK = 0x15;
private double readCoordinate(ByteBuf buf, boolean extended) {
long value = buf.readUnsignedInt();
if (extended ? (value & 0x08000000) != 0 : (value & 0x00800000) != 0) {
value |= extended ? 0xF0000000 : 0xFF000000;
}
return (int) value / (extended ? 360000.0 : 3600.0);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.readUnsignedShort(); // length
buf.readUnsignedByte(); // software version
long serialNumber = buf.readUnsignedInt();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(serialNumber));
if (deviceSession == null) {
return null;
}
buf.readUnsignedByte(); // product
int type = buf.readUnsignedByte();
if (type == MSG_STATUS) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setFixTime(new Date(buf.readUnsignedInt() * 1000L));
boolean extended = buf.getUnsignedByte(buf.readerIndex()) != 0;
position.setLatitude(readCoordinate(buf, extended));
position.setLongitude(readCoordinate(buf, extended));
position.setCourse(buf.readUnsignedShort());
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.setValid(buf.readUnsignedByte() > 0);
position.setDeviceTime(new Date(buf.readUnsignedInt() * 1000L));
position.set(Position.KEY_EVENT, buf.readUnsignedShort());
int input = buf.readUnsignedShort();
position.set(Position.KEY_IGNITION, BitUtil.check(input, 0));
position.set(Position.KEY_INPUT, input);
position.set(Position.KEY_OUTPUT, buf.readUnsignedShort());
position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
position.set(Position.KEY_DEVICE_TEMP, buf.readByte());
buf.readUnsignedShort(); // reserved
if (buf.readableBytes() > 4) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
}
if (buf.readableBytes() > 4) {
position.set(Position.KEY_HOURS, UnitsConverter.msFromHours(buf.readUnsignedInt()));
}
return position;
}
return null;
}
}
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