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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.nio.ByteOrder;
import java.nio.charset.Charset;
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.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class NoranProtocolDecoder extends BaseProtocolDecoder {
public NoranProtocolDecoder(String protocol) {
super(protocol);
}
private static final int MSG_UPLOAD_POSITION = 0x0008;
private static final int MSG_CONTROL_RESPONSE = 0x8009;
private static final int MSG_ALARM = 0x0003;
private static final int MSG_SHAKE_HAND = 0x0000;
private static final int MSG_SHAKE_HAND_RESPONSE = 0x8000;
private static final int MSG_IMAGE_SIZE = 0x0200;
private static final int MSG_IMAGE_PACKET = 0x0201;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedShort(); // length
int type = buf.readUnsignedShort();
if (type == MSG_SHAKE_HAND && channel != null) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 13);
response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "\r\n*KW", Charset.defaultCharset()));
response.writeByte(0);
response.writeShort(response.capacity());
response.writeShort(MSG_SHAKE_HAND_RESPONSE);
response.writeByte(1); // status
response.writeBytes(ChannelBuffers.copiedBuffer(ByteOrder.LITTLE_ENDIAN, "\r\n", Charset.defaultCharset()));
channel.write(response, remoteAddress);
}
else if (type == MSG_UPLOAD_POSITION ||
type == MSG_CONTROL_RESPONSE ||
type == MSG_ALARM) {
// Create new position
Position position = new Position();
position.setProtocol(getProtocol());
if (type == MSG_CONTROL_RESPONSE) {
buf.readUnsignedInt(); // GIS ip
buf.readUnsignedInt(); // GIS port
}
// Flags
int flags = buf.readUnsignedByte();
position.setValid((flags & 0x01) != 0);
// Alarm type
position.set(Event.KEY_ALARM, buf.readUnsignedByte());
// Location
position.setSpeed(buf.readUnsignedByte());
position.setCourse(buf.readUnsignedShort());
position.setLongitude(buf.readFloat());
position.setLatitude(buf.readFloat());
// Time
long timeValue = buf.readUnsignedInt();
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + (int) (timeValue >> 26));
time.set(Calendar.MONTH, (int) (timeValue >> 22 & 0x0f) - 1);
time.set(Calendar.DAY_OF_MONTH, (int) (timeValue >> 17 & 0x1f));
time.set(Calendar.HOUR_OF_DAY, (int) (timeValue >> 12 & 0x1f));
time.set(Calendar.MINUTE, (int) (timeValue >> 6 & 0x3f));
time.set(Calendar.SECOND, (int) (timeValue & 0x3f));
position.setTime(time.getTime());
// Identification
String id = buf.readBytes(11).toString(Charset.defaultCharset()).replaceAll("[^\\p{Print}]", "");
if (!identify(id)) {
return null;
}
position.setDeviceId(getDeviceId());
// IO status
position.set(Event.PREFIX_IO + 1, buf.readUnsignedByte());
// Fuel
position.set(Event.KEY_FUEL, buf.readUnsignedByte());
return position;
}
return null;
}
}
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