/*
* Copyright 2012 - 2013 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.Context;
import org.traccar.DeviceSession;
import org.traccar.helper.BitUtil;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Log;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class SkypatrolProtocolDecoder extends BaseProtocolDecoder {
private final long defaultMask;
public SkypatrolProtocolDecoder(SkypatrolProtocol protocol) {
super(protocol);
defaultMask = Context.getConfig().getInteger(getProtocolName() + ".mask");
}
private static double convertCoordinate(long coordinate) {
int sign = 1;
if (coordinate > 0x7fffffffL) {
sign = -1;
coordinate = 0xffffffffL - coordinate;
}
long degrees = coordinate / 1000000;
double minutes = (coordinate % 1000000) / 10000.0;
return sign * (degrees + minutes / 60);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
int apiNumber = buf.readUnsignedShort();
int commandType = buf.readUnsignedByte();
int messageType = BitUtil.from(buf.readUnsignedByte(), 4);
long mask = defaultMask;
if (buf.readUnsignedByte() == 4) {
mask = buf.readUnsignedInt();
}
// Binary position report
if (apiNumber == 5 && commandType == 2 && messageType == 1 && BitUtil.check(mask, 0)) {
Position position = new Position();
position.setProtocol(getProtocolName());
if (BitUtil.check(mask, 1)) {
position.set(Position.KEY_STATUS, buf.readUnsignedInt());
}
String id;
if (BitUtil.check(mask, 23)) {
id = buf.toString(buf.readerIndex(), 8, StandardCharsets.US_ASCII).trim();
buf.skipBytes(8);
} else if (BitUtil.check(mask, 2)) {
id = buf.toString(buf.readerIndex(), 22, StandardCharsets.US_ASCII).trim();
buf.skipBytes(22);
} else {
Log.warning("No device id field");
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
if (BitUtil.check(mask, 3)) {
position.set(Position.PREFIX_IO + 1, buf.readUnsignedShort());
}
if (BitUtil.check(mask, 4)) {
position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShort());
}
if (BitUtil.check(mask, 5)) {
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShort());
}
if (BitUtil.check(mask, 7)) {
buf.readUnsignedByte(); // function category
}
DateBuilder dateBuilder = new DateBuilder();
if (BitUtil.check(mask, 8)) {
dateBuilder.setDateReverse(
buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
}
if (BitUtil.check(mask, 9)) {
position.setValid(buf.readUnsignedByte() == 1); // gps status
}
if (BitUtil.check(mask, 10)) {
position.setLatitude(convertCoordinate(buf.readUnsignedInt()));
}
if (BitUtil.check(mask, 11)) {
position.setLongitude(convertCoordinate(buf.readUnsignedInt()));
}
if (BitUtil.check(mask, 12)) {
position.setSpeed(buf.readUnsignedShort() / 10.0);
}
if (BitUtil.check(mask, 13)) {
position.setCourse(buf.readUnsignedShort() / 10.0);
}
if (BitUtil.check(mask, 14)) {
dateBuilder.setTime(
buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
}
position.setTime(dateBuilder.getDate());
if (BitUtil.check(mask, 15)) {
position.setAltitude(buf.readMedium());
}
if (BitUtil.check(mask, 16)) {
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());
}
if (BitUtil.check(mask, 17)) {
position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
}
if (BitUtil.check(mask, 20)) {
position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt());
}
if (BitUtil.check(mask, 21)) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
}
if (BitUtil.check(mask, 22)) {
buf.skipBytes(6); // time of message generation
}
if (BitUtil.check(mask, 24)) {
position.set(Position.KEY_POWER, buf.readUnsignedShort() * 0.001);
}
if (BitUtil.check(mask, 25)) {
buf.skipBytes(18); // gps overspeed
}
if (BitUtil.check(mask, 26)) {
buf.skipBytes(54); // cell information
}
if (BitUtil.check(mask, 28)) {
position.set(Position.KEY_INDEX, buf.readUnsignedShort());
}
return position;
}
return null;
}
}