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/*
* Copyright 2013 - 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.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.regex.Pattern;
public class Tk102ProtocolDecoder extends BaseProtocolDecoder {
public Tk102ProtocolDecoder(Tk102Protocol protocol) {
super(protocol);
}
public static final int MSG_LOGIN_REQUEST = 0x80;
public static final int MSG_LOGIN_REQUEST_2 = 0x21;
public static final int MSG_LOGIN_RESPONSE = 0x00;
public static final int MSG_HEARTBEAT_REQUEST = 0xF0;
public static final int MSG_HEARTBEAT_RESPONSE = 0xFF;
public static final int MSG_REPORT_ONCE = 0x90;
public static final int MSG_REPORT_INTERVAL = 0x93;
public static final int MODE_GPRS = 0x30;
public static final int MODE_GPRS_SMS = 0x33;
private static final Pattern PATTERN = new PatternBuilder()
.text("(")
.expression("[A-Z]+")
.number("(dd)(dd)(dd)") // time (hhmmss)
.expression("([AV])") // validity
.number("(dd)(dd.dddd)([NS])") // latitude
.number("(ddd)(dd.dddd)([EW])") // longitude
.number("(ddd.ddd)") // speed
.number("(dd)(dd)(dd)") // date (ddmmyy)
.any()
.text(")")
.compile();
private void sendResponse(Channel channel, int type, ByteBuf dataSequence, ByteBuf content) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte('[');
response.writeByte(type);
response.writeBytes(dataSequence);
response.writeByte(content.readableBytes());
response.writeBytes(content);
response.writeByte(']');
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(1); // header
int type = buf.readUnsignedByte();
ByteBuf dataSequence = buf.readBytes(10);
int length = buf.readUnsignedByte();
if (type == MSG_LOGIN_REQUEST || type == MSG_LOGIN_REQUEST_2) {
ByteBuf data = buf.readBytes(length);
String id;
if (type == MSG_LOGIN_REQUEST) {
id = data.toString(StandardCharsets.US_ASCII);
} else {
id = data.copy(1, 15).toString(StandardCharsets.US_ASCII);
}
if (getDeviceSession(channel, remoteAddress, id) != null) {
ByteBuf response = Unpooled.buffer();
response.writeByte(MODE_GPRS);
response.writeBytes(data);
sendResponse(channel, MSG_LOGIN_RESPONSE, dataSequence, response);
}
} else if (type == MSG_HEARTBEAT_REQUEST) {
sendResponse(channel, MSG_HEARTBEAT_RESPONSE, dataSequence, buf.readBytes(length));
} else {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Parser parser = new Parser(PATTERN, buf.readBytes(length).toString(StandardCharsets.US_ASCII));
if (!parser.matches()) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setValid(parser.next().equals("A"));
position.setLatitude(parser.nextCoordinate());
position.setLongitude(parser.nextCoordinate());
position.setSpeed(parser.nextDouble(0));
dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setTime(dateBuilder.getDate());
return position;
}
return null;
}
}
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