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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.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.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;
public class WristbandProtocolDecoder extends BaseProtocolDecoder {
public WristbandProtocolDecoder(Protocol protocol) {
super(protocol);
}
private void sendResponse(
Channel channel, String imei, String version, int type, String data) {
if (channel != null) {
String sentence = String.format("YX%s|%s|0|{F%d#%s}\r\n", imei, version, type, data);
ByteBuf response = Unpooled.buffer();
if (type != 91) {
response.writeBytes(new byte[]{0x00, 0x01, 0x02});
response.writeShort(sentence.length());
}
response.writeCharSequence(sentence, StandardCharsets.US_ASCII);
if (type != 91) {
response.writeBytes(new byte[]{(byte) 0xFF, (byte) 0xFE, (byte) 0xFC});
}
channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
}
}
private static final Pattern PATTERN = new PatternBuilder()
.expression("..") // header
.number("(d+)|") // imei
.number("([vV]d+.d+)|") // version
.number("d+|") // model
.text("{")
.number("F(d+)") // function
.groupBegin()
.text("#")
.expression("(.*)") // data
.groupEnd("?")
.text("}")
.text("\r\n")
.compile();
private Position decodePosition(DeviceSession deviceSession, String sentence) throws ParseException {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
String[] values = sentence.split(",");
position.setValid(true);
position.setLongitude(Double.parseDouble(values[0]));
position.setLatitude(Double.parseDouble(values[1]));
position.setTime(new SimpleDateFormat("yyyyMMddHHmmss").parse(values[2]));
position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(values[3])));
return position;
}
private List<Position> decodeMessage(
Channel channel, SocketAddress remoteAddress, String sentence) throws ParseException {
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
String imei = parser.next();
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
String version = parser.next();
int type = parser.nextInt();
List<Position> positions = new LinkedList<>();
switch (type) {
case 90:
sendResponse(channel, imei, version, type, getServer(channel, ','));
break;
case 91:
String time = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
sendResponse(channel, imei, version, type, time + "|" + getServer(channel, ','));
break;
case 1:
sendResponse(channel, imei, version, type, "0");
break;
case 2:
for (String fragment : parser.next().split("\\|")) {
positions.add(decodePosition(deviceSession, fragment));
}
break;
default:
break;
}
return positions.isEmpty() ? null : positions;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(3); // header
buf.readUnsignedShort(); // length
String sentence = buf.toString(buf.readerIndex(), buf.readableBytes() - 3, StandardCharsets.US_ASCII);
buf.skipBytes(3); // footer
return decodeMessage(channel, remoteAddress, sentence);
}
}
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