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/*
* 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 java.util.Calendar;
import java.util.TimeZone;
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.ChannelBufferTools;
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 {
private static double convertCoordinate(short degrees, int raw) {
double seconds = (raw >> 4 & 0xffffff) / 600000.0;
return (degrees + seconds) * ((raw & 0x0f) == 0 ? -1 : 1);
}
public AutoFon45ProtocolDecoder(AutoFon45Protocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int type = buf.getUnsignedByte(0);
if (type == MSG_LOGIN) {
byte[] bytes = new byte[19];
buf.readBytes(bytes);
String imei = ChannelBufferTools.readHexString(ChannelBuffers.wrappedBuffer(bytes, 1, 16), 16).substring(1);
if (!identify(imei, channel)) {
return null;
}
// Send response (CRC)
if (channel != null) {
byte[] response = "resp_crc=".getBytes("US-ASCII");
response = Arrays.copyOf(response, response.length + 1);
response[response.length - 1] = crc(bytes, 0, 18);
channel.write(ChannelBuffers.wrappedBuffer(response));
}
} else if (type == MSG_LOCATION) {
buf.readUnsignedByte();
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
short status = buf.readUnsignedByte();
position.set(Event.KEY_ALARM, (status & 0x80) != 0);
position.set(Event.KEY_BATTERY, status & 0x7F);
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
// GPS status
int valid = buf.readUnsignedByte();
position.setValid((valid & 0xc0) != 0);
position.set(Event.KEY_SATELLITES, valid & 0x3f);
// Date and time
int timeOfDay = buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte();
int date = buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte();
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, timeOfDay / 10000);
time.set(Calendar.MINUTE, (timeOfDay - time.get(Calendar.HOUR_OF_DAY) * 10000) / 100);
time.set(Calendar.SECOND, (timeOfDay - time.get(Calendar.HOUR_OF_DAY) * 10000 - time.get(Calendar.MINUTE) * 100));
time.set(Calendar.DAY_OF_MONTH, date / 10000);
time.set(Calendar.MONTH, (date - time.get(Calendar.DAY_OF_MONTH) * 10000) / 100 - 1);
time.set(Calendar.YEAR, 2000 + (date - time.get(Calendar.DAY_OF_MONTH) * 10000 - (time.get(Calendar.MONTH) + 1) * 100));
position.setTime(time.getTime());
// Location
position.setLatitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte()));
position.setLongitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedByte() << 16 | buf.readUnsignedByte() << 8 | buf.readUnsignedByte()));
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedByte() << 8 | buf.readUnsignedByte());
buf.readUnsignedByte(); // checksum
return position;
}
return null;
}
private byte crc(byte[] bytes, int offset, int len) {
byte GPRS_CRC = 0x3B;
for (int i = offset; i < offset + len; i++) {
GPRS_CRC += 0x56 ^ bytes[i];
GPRS_CRC++;
GPRS_CRC ^= 0xC5 + bytes[i];
GPRS_CRC--;
}
return GPRS_CRC;
}
}
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