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/*
* Copyright 2016 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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.LinkedList;
import java.util.List;
public class AstraProtocolDecoder extends BaseProtocolDecoder {
public AstraProtocolDecoder(AstraProtocol protocol) {
super(protocol);
}
public static final int MSG_HEARTBEAT = 0x1A;
public static final int MSG_DATA = 0x10;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
if (channel != null) {
channel.write(ChannelBuffers.wrappedBuffer(new byte[] {0x06}), remoteAddress);
}
buf.readUnsignedByte(); // protocol
buf.readUnsignedShort(); // length
String imei = String.format("%08d", buf.readUnsignedInt()) + String.format("%07d", buf.readUnsignedMedium());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
while (buf.readableBytes() > 2) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // index
position.setLatitude(buf.readInt() * 0.000001);
position.setLongitude(buf.readInt() * 0.000001);
DateBuilder dateBuilder = new DateBuilder()
.setDate(1980, 1, 6).addMillis(buf.readUnsignedInt() * 1000L);
position.setTime(dateBuilder.getDate());
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte() * 2));
position.setCourse(buf.readUnsignedByte() * 2);
int reason = buf.readUnsignedMedium();
position.set(Position.KEY_EVENT, reason);
position.set(Position.KEY_STATUS, buf.readUnsignedShort());
position.set(Position.PREFIX_IO + 1, buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 1, buf.readUnsignedByte());
position.set(Position.KEY_BATTERY, buf.readUnsignedByte());
position.set(Position.KEY_POWER, buf.readUnsignedByte());
buf.readUnsignedByte(); // max journey speed
buf.skipBytes(6); // accelerometer
buf.readUnsignedShort(); // journey distance
buf.readUnsignedShort(); // journey idle time
position.setAltitude(buf.readUnsignedByte() * 20);
int quality = buf.readUnsignedByte();
position.set(Position.KEY_SATELLITES, quality & 0xf);
position.set(Position.KEY_GSM, quality >> 4);
buf.readUnsignedByte(); // geofence events
if (BitUtil.check(reason, 6) || BitUtil.check(reason, 7)) {
position.set(Position.KEY_RFID, buf.readBytes(7).toString(StandardCharsets.US_ASCII));
position.set(Position.KEY_ODOMETER, buf.readUnsignedMedium());
buf.readUnsignedShort(); // engine time
}
// extra data
positions.add(position);
}
return positions;
}
}
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