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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.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class Gl200BinaryProtocolDecoder extends BaseProtocolDecoder {
public Gl200BinaryProtocolDecoder(Gl200Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
String header = buf.readBytes(4).toString(StandardCharsets.US_ASCII);
if (header.equals("+EVT")) {
Position position = new Position();
position.setProtocol(getProtocolName());
buf.readUnsignedByte(); // message type
buf.readUnsignedInt(); // mask
buf.readUnsignedShort(); // length
buf.readUnsignedByte(); // device type
buf.readUnsignedShort(); // protocol version
position.set(Position.KEY_VERSION_FW, String.valueOf(buf.readUnsignedShort()));
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, String.format("%015d", buf.readLong()));
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
position.set(Position.KEY_BATTERY_LEVEL, buf.readUnsignedByte());
position.set(Position.KEY_POWER, buf.readUnsignedShort());
buf.readUnsignedByte(); // motion status
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
position.set(Position.KEY_INDEX, buf.readUnsignedByte());
int hdop = buf.readUnsignedByte();
position.setValid(hdop > 0);
position.set(Position.KEY_HDOP, hdop);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedMedium()));
position.setCourse(buf.readUnsignedShort());
position.setAltitude(buf.readShort());
position.setLongitude(buf.readInt() * 0.000001);
position.setLatitude(buf.readInt() * 0.000001);
DateBuilder dateBuilder = new DateBuilder()
.setDate(buf.readUnsignedShort(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
position.setNetwork(new Network(CellTower.from(
buf.readUnsignedShort(), buf.readUnsignedShort(),
buf.readUnsignedShort(), buf.readUnsignedShort())));
buf.readUnsignedByte(); // reserved
return position;
}
return null;
}
}
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