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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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class TelemaxProtocolDecoder extends BaseProtocolDecoder {
public TelemaxProtocolDecoder(Protocol protocol) {
super(protocol);
}
private String readValue(String sentence, int[] index, int length) {
String value = sentence.substring(index[0], index[0] + length);
index[0] += length;
return value;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
String sentence = (String) msg;
if (sentence.startsWith("%")) {
int length = Integer.parseInt(sentence.substring(1, 3));
getDeviceSession(channel, remoteAddress, sentence.substring(3, 3 + length));
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
int[] index = {0};
if (!readValue(sentence, index, 1).equals("Y")) {
return null;
}
readValue(sentence, index, 8); // command id
readValue(sentence, index, 6); // password
readValue(sentence, index, Integer.parseInt(readValue(sentence, index, 2), 16)); // unit id
readValue(sentence, index, 2); // frame count
readValue(sentence, index, 2); // data format
int interval = Integer.parseInt(readValue(sentence, index, 4), 16);
readValue(sentence, index, 2); // info flags
readValue(sentence, index, 2); // version
int count = Integer.parseInt(readValue(sentence, index, 2), 16);
Date time = null;
List<Position> positions = new LinkedList<>();
for (int i = 0; i < count; i++) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int speed = Integer.parseInt(readValue(sentence, index, 2), 16);
position.setValid(BitUtil.check(speed, 7));
position.setSpeed(BitUtil.to(speed, 7));
position.setLongitude((Integer.parseInt(readValue(sentence, index, 6), 16) - 5400000) / 30000.0);
position.setLatitude((Integer.parseInt(readValue(sentence, index, 6), 16) - 5400000) / 30000.0);
if (i == 0 | i == count - 1) {
time = new SimpleDateFormat("yyMMddHHmmss").parse(readValue(sentence, index, 12));
position.set(Position.KEY_STATUS, readValue(sentence, index, 8));
} else {
time = new Date(time.getTime() + interval * 1000);
}
position.setTime(time);
positions.add(position);
}
return positions;
}
}
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