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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
public class MxtProtocolDecoder extends BaseProtocolDecoder {
public MxtProtocolDecoder(String protocol) {
super(protocol);
}
private static final int MSG_ACK = 0x02;
private static final int MSG_NACK = 0x03;
private static final int MSG_POSITION = 0x31;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedByte(); // start
buf.readUnsignedByte(); // device descriptor
int type = buf.readUnsignedByte();
String id = String.valueOf(buf.readUnsignedInt());
if (!identify(id)) {
return null;
}
if (type == MSG_POSITION) {
Position position = new Position();
position.setProtocol(getProtocol());
position.setDeviceId(getDeviceId());
buf.readUnsignedByte(); // protocol
int infoGroups = buf.readUnsignedByte();
position.set(Event.KEY_INDEX, buf.readUnsignedShort());
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000);
time.set(Calendar.MONTH, 0);
time.set(Calendar.DAY_OF_MONTH, 1);
long date = buf.readUnsignedInt();
long days = date >> (5 + 6 + 6);
long hours = (date >> (6 + 6)) & 0x1f;
long minutes = (date >> 6) & 0x3f;
long seconds = date & 0x3f;
long millis = time.getTimeInMillis();
millis += (((days * 24 + hours) * 60 + minutes) * 60 + seconds) * 1000;
position.setTime(new Date(millis));
// Location
position.setValid(true);
position.setLatitude(buf.readInt() / 1000000.0);
position.setLongitude(buf.readInt() / 1000000.0);
long flags = buf.readUnsignedInt();
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
int inputMask = buf.readUnsignedByte();
return position;
}
return null;
}
}
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