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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.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class Pt215ProtocolDecoder extends BaseProtocolDecoder {
public Pt215ProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN = 0x01;
public static final int MSG_HEARTBEAT = 0x08;
public static final int MSG_GPS_REALTIME = 0x10;
public static final int MSG_GPS_OFFLINE = 0x11;
public static final int MSG_STATUS = 0x13;
private void sendResponse(
Channel channel, SocketAddress remoteAddress, int type, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte('X');
response.writeByte('X');
response.writeByte(content != null ? 1 + content.readableBytes() : 1);
response.writeByte(type);
if (content != null) {
response.writeBytes(content);
content.release();
}
response.writeByte('\r');
response.writeByte('\n');
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
buf.readUnsignedByte(); // length
int type = buf.readUnsignedByte();
if (type == MSG_LOGIN) {
getDeviceSession(channel, remoteAddress, ByteBufUtil.hexDump(buf.readSlice(8)).substring(1));
sendResponse(channel, remoteAddress, type, null);
} else if (type == MSG_GPS_OFFLINE || type == MSG_GPS_REALTIME) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
sendResponse(channel, remoteAddress, type, buf.retainedSlice(buf.readerIndex(), 6));
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
double latitude = buf.readUnsignedInt() / 60.0 / 30000.0;
double longitude = buf.readUnsignedInt() / 60.0 / 30000.0;
int flags = buf.readUnsignedShort();
position.setCourse(BitUtil.to(flags, 10));
position.setValid(BitUtil.check(flags, 12));
if (!BitUtil.check(flags, 10)) {
latitude = -latitude;
}
if (BitUtil.check(flags, 11)) {
longitude = -longitude;
}
position.setLatitude(latitude);
position.setLongitude(longitude);
return position;
}
return null;
}
}
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