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/*
* Copyright 2012 - 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.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
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 EnforaProtocolDecoder extends BaseProtocolDecoder {
public EnforaProtocolDecoder(EnforaProtocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.text("GPRMC,")
.number("(dd)(dd)(dd).?d*,") // time (hhmmss)
.expression("([AV]),") // validity
.number("(dd)(dd.d+),") // latitude
.expression("([NS]),")
.number("(ddd)(dd.d+),") // longitude
.expression("([EW]),")
.number("(d+.d+)?,") // speed
.number("(d+.d+)?,") // course
.number("(dd)(dd)(dd),") // date (ddmmyy)
.any()
.compile();
public static final int IMEI_LENGTH = 15;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
// Find IMEI number
int index = -1;
for (int i = buf.readerIndex(); i < buf.writerIndex() - IMEI_LENGTH; i++) {
index = i;
for (int j = i; j < i + IMEI_LENGTH; j++) {
if (!Character.isDigit((char) buf.getByte(j))) {
index = -1;
break;
}
}
if (index > 0) {
break;
}
}
if (index == -1) {
return null;
}
String imei = buf.toString(index, IMEI_LENGTH, StandardCharsets.US_ASCII);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
// Find NMEA sentence
ByteBuf header = Unpooled.wrappedBuffer("GPRMC".getBytes(StandardCharsets.US_ASCII));
int start = ByteBufUtil.indexOf(header, buf);
if (start == -1) {
return null;
}
String sentence = buf.toString(start, buf.readableBytes() - start, StandardCharsets.US_ASCII);
Parser parser = new Parser(PATTERN, sentence);
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));
position.setCourse(parser.nextDouble(0));
dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0));
position.setTime(dateBuilder.getDate());
return position;
}
}
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