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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
* Copyright 2015 Vitaly Litvak (vitavaque@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 java.net.SocketAddress;
import java.util.Arrays;
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.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Event;
import org.traccar.model.Position;
import static org.traccar.protocol.AutoFon45FrameDecoder.MSG_LOCATION;
import static org.traccar.protocol.AutoFon45FrameDecoder.MSG_LOGIN;
public class AutoFon45ProtocolDecoder extends BaseProtocolDecoder {
public AutoFon45ProtocolDecoder(AutoFon45Protocol protocol) {
super(protocol);
}
private static double convertCoordinate(short degrees, int minutes) {
double value = degrees + BitUtil.from(minutes, 4) / 600000.0;
if (BitUtil.check(minutes, 0)) {
return value;
} else {
return -value;
}
}
private static byte checksum(byte[] bytes, int offset, int len) {
byte result = 0x3B;
for (int i = offset; i < offset + len; i++) {
result += 0x56 ^ bytes[i];
result++;
result ^= 0xC5 + bytes[i];
result--;
}
return result;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.getUnsignedByte(buf.readerIndex());
if (type == MSG_LOGIN) {
byte[] bytes = new byte[19];
buf.readBytes(bytes);
String imei = ChannelBuffers.hexDump(ChannelBuffers.wrappedBuffer(bytes, 1, 8)).substring(1);
if (!identify(imei, channel, remoteAddress)) {
return null;
}
// Send response (checksum)
if (channel != null) {
byte[] response = "resp_crc=".getBytes("US-ASCII");
response = Arrays.copyOf(response, response.length + 1);
response[response.length - 1] = checksum(bytes, 0, 18);
channel.write(ChannelBuffers.wrappedBuffer(response));
}
} else if (type == MSG_LOCATION) {
buf.readUnsignedByte();
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
short status = buf.readUnsignedByte();
position.set(Event.KEY_ALARM, BitUtil.check(status, 7));
position.set(Event.KEY_BATTERY, BitUtil.to(status, 7));
buf.skipBytes(2); // remaining time
position.set(Event.PREFIX_TEMP + 1, buf.readByte());
buf.skipBytes(2); // timer (interval and units)
buf.readByte(); // mode
buf.readByte(); // gprs sending interval
buf.skipBytes(6); // mcc, mnc, lac, cid
int valid = buf.readUnsignedByte();
position.setValid(BitUtil.from(valid, 6) != 0);
position.set(Event.KEY_SATELLITES, BitUtil.from(valid, 6));
int time = buf.readUnsignedMedium();
int date = buf.readUnsignedMedium();
DateBuilder dateBuilder = new DateBuilder()
.setTime(time / 10000, time / 100 % 100, time % 100)
.setDateReverse(date / 10000, date / 100 % 100, date % 100);
position.setTime(dateBuilder.getDate());
position.setLatitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
position.setLongitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedShort());
return position;
}
return null;
}
}
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