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/*
* Copyright 2017 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.BcdUtil;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class Vt200ProtocolDecoder extends BaseProtocolDecoder {
public Vt200ProtocolDecoder(Vt200Protocol protocol) {
super(protocol);
}
private static double decodeCoordinate(int value) {
int degrees = value / 1000000;
int minutes = value % 1000000;
return degrees + minutes * 0.0001 / 60;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(1); // header
String id = ChannelBuffers.hexDump(buf.readBytes(6));
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
int type = buf.readUnsignedShort();
buf.readUnsignedShort(); // length
if (type == 0x2086 || type == 0x2084 || type == 0x2082) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // data type
buf.readUnsignedShort(); // trip id
DateBuilder dateBuilder = new DateBuilder();
dateBuilder.setDateReverse(
BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
dateBuilder.setTime(
BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2), BcdUtil.readInteger(buf, 2));
position.setTime(dateBuilder.getDate());
position.setLatitude(decodeCoordinate(BcdUtil.readInteger(buf, 8)));
position.setLongitude(decodeCoordinate(BcdUtil.readInteger(buf, 9)));
int flags = buf.readUnsignedByte();
position.setValid(BitUtil.check(flags, 0));
if (!BitUtil.check(flags, 1)) {
position.setLatitude(-position.getLatitude());
}
if (!BitUtil.check(flags, 1)) {
position.setLongitude(-position.getLongitude());
}
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedByte() * 2);
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_RSSI, buf.readUnsignedByte());
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt() * 1000);
position.set(Position.KEY_STATUS, buf.readUnsignedInt());
// additional data
return position;
}
return null;
}
}
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