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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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.model.Event;
import org.traccar.model.Position;
import java.util.*;
public class AutoFonProtocolDecoder extends BaseProtocolDecoder {
public AutoFonProtocolDecoder(AutoFonProtocol protocol) {
super(protocol);
}
private static final int MSG_LOGIN = 0x10;
private static final int MSG_LOCATION = 0x11;
private static final int MSG_HISTORY = 0x12;
private static double convertCoordinate(int raw) {
double result = raw / 1000000;
result += (raw % 1000000) / 600000.0;
return result;
}
private Position decodePosition(ChannelBuffer buf, boolean history) {
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
if (!history) {
buf.readUnsignedByte(); // interval
buf.skipBytes(8); // settings
}
buf.readUnsignedByte(); // status
if (!history) {
buf.readUnsignedShort();
}
position.set(Event.KEY_BATTERY, buf.readUnsignedByte());
buf.skipBytes(6); // time
// Timers
if (!history) {
for (int i = 0; i < 2; i++) {
buf.skipBytes(5); // time
buf.readUnsignedShort(); // interval
buf.skipBytes(5); // mode
}
}
position.set(Event.PREFIX_TEMP + 1, buf.readByte());
position.set(Event.KEY_GSM, buf.readUnsignedByte());
buf.readUnsignedShort(); // mcc
buf.readUnsignedShort(); // mnc
buf.readUnsignedShort(); // lac
buf.readUnsignedShort(); // cid
// GPS status
int valid = buf.readUnsignedByte();
position.setValid((valid & 0xc0) != 0);
position.set(Event.KEY_SATELLITES, valid & 0x3f);
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
position.setTime(time.getTime());
// Location
position.setLatitude(convertCoordinate(buf.readInt()));
position.setLongitude(convertCoordinate(buf.readInt()));
position.setAltitude(buf.readShort());
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedByte() * 2.0);
position.set(Event.KEY_HDOP, buf.readUnsignedShort());
buf.readUnsignedShort(); // reserved
buf.readUnsignedByte(); // checksum
return position;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.readUnsignedByte();
if (type == MSG_LOGIN) {
buf.readUnsignedByte(); // hardware version
buf.readUnsignedByte(); // software version
String imei = ChannelBufferTools.readHexString(buf, 16).substring(1);
if (!identify(imei, channel)) {
return null;
}
// Send response
if (channel != null) {
channel.write(ChannelBuffers.wrappedBuffer(new byte[] { buf.readByte() }));
}
} else if (type == MSG_LOCATION) {
return decodePosition(buf, false);
} else if (type == MSG_HISTORY) {
int count = buf.readUnsignedByte() & 0x0f;
buf.readUnsignedShort(); // total count
List<Position> positions = new LinkedList<Position>();
for (int i = 0; i < count; i++) {
positions.add(decodePosition(buf, true));
}
return positions;
}
return null;
}
}
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