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/*
* Copyright 2013 - 2014 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 java.net.SocketAddress;
import java.util.Calendar;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class GatorProtocolDecoder extends BaseProtocolDecoder {
public GatorProtocolDecoder(GatorProtocol protocol) {
super(protocol);
}
public static final int MSG_HEARTBEAT = 0x21;
public static final int MSG_POSITION_DATA = 0x80;
public static final int MSG_ROLLCALL_RESPONSE = 0x81;
public static final int MSG_ALARM_DATA = 0x82;
public static final int MSG_TERMINAL_STATUS = 0x83;
public static final int MSG_MESSAGE = 0x84;
public static final int MSG_TERMINAL_ANSWER = 0x85;
public static final int MSG_BLIND_AREA = 0x8E;
public static final int MSG_PICTURE_FRAME = 0x54;
public static final int MSG_CAMERA_RESPONSE = 0x56;
public static final int MSG_PICTURE_DATA = 0x57;
public static String decodeId(int b1, int b2, int b3, int b4) {
int d1 = 30 + ((b1 >> 7) << 3) + ((b2 >> 7) << 2) + ((b3 >> 7) << 1) + (b4 >> 7);
int d2 = b1 & 0x7f;
int d3 = b2 & 0x7f;
int d4 = b3 & 0x7f;
int d5 = b4 & 0x7f;
return String.format("%02d%02d%02d%02d%02d", d1, d2, d3, d4, d5);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
String id = decodeId(
buf.readUnsignedByte(), buf.readUnsignedByte(),
buf.readUnsignedByte(), buf.readUnsignedByte());
if (type == MSG_POSITION_DATA || type == MSG_ROLLCALL_RESPONSE
|| type == MSG_ALARM_DATA || type == MSG_BLIND_AREA) {
Position position = new Position();
position.setProtocol(getProtocolName());
if (!identify("1" + id, channel, null, false) && !identify(id, channel)) {
return null;
}
position.setDeviceId(getDeviceId());
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MONTH, ChannelBufferTools.readHexInteger(buf, 2) - 1);
time.set(Calendar.DAY_OF_MONTH, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.HOUR_OF_DAY, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MINUTE, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.SECOND, ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(time.getTime());
// Location
position.setLatitude(ChannelBufferTools.readCoordinate(buf));
position.setLongitude(ChannelBufferTools.readCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(ChannelBufferTools.readHexInteger(buf, 4)));
position.setCourse(ChannelBufferTools.readHexInteger(buf, 4));
// Flags
int flags = buf.readUnsignedByte();
position.setValid((flags & 0x80) != 0);
position.set(Event.KEY_SATELLITES, flags & 0x0f);
// Status
position.set(Event.KEY_STATUS, buf.readUnsignedByte());
// Key switch
position.set("key", buf.readUnsignedByte());
// Oil
position.set("oil", buf.readUnsignedShort() / 10.0);
// Power
position.set(Event.KEY_POWER, buf.readUnsignedByte() + buf.readUnsignedByte() / 100.0);
// Odometer
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
return position;
}
return null;
}
}
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