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/*
* Copyright 2013 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.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.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class CellocatorProtocolDecoder extends BaseProtocolDecoder {
public CellocatorProtocolDecoder(CellocatorProtocol protocol) {
super(protocol);
}
static final int MSG_CLIENT_STATUS = 0;
static final int MSG_CLIENT_PROGRAMMING = 3;
static final int MSG_CLIENT_SERIAL_LOG = 7;
static final int MSG_CLIENT_SERIAL = 8;
static final int MSG_CLIENT_MODULAR = 9;
public static final int MSG_SERVER_ACKNOWLEDGE = 4;
private byte commandCount;
private void sendReply(Channel channel, long deviceId, byte packetNumber) {
ChannelBuffer reply = ChannelBuffers.directBuffer(ByteOrder.LITTLE_ENDIAN, 28);
reply.writeByte('M');
reply.writeByte('C');
reply.writeByte('G');
reply.writeByte('P');
reply.writeByte(MSG_SERVER_ACKNOWLEDGE);
reply.writeInt((int) deviceId);
reply.writeByte(commandCount++);
reply.writeInt(0); // authentication code
reply.writeByte(0);
reply.writeByte(packetNumber);
reply.writeZero(11);
byte checksum = 0;
for (int i = 4; i < 27; i++) {
checksum += reply.getByte(i);
}
reply.writeByte(checksum);
if (channel != null) {
channel.write(reply);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(4); // system code
int type = buf.readUnsignedByte();
long deviceUniqueId = buf.readUnsignedInt();
if (type != MSG_CLIENT_SERIAL) {
buf.readUnsignedShort(); // communication control
}
byte packetNumber = buf.readByte();
// Send reply
sendReply(channel, deviceUniqueId, packetNumber);
// Parse location
if (type == MSG_CLIENT_STATUS) {
Position position = new Position();
position.setProtocol(getProtocolName());
// Device identifier
if (!identify(String.valueOf(deviceUniqueId), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
buf.readUnsignedByte(); // hardware version
buf.readUnsignedByte(); // software version
buf.readUnsignedByte(); // protocol version
// Status
position.set(Event.KEY_STATUS, buf.getUnsignedByte(buf.readerIndex()) & 0x0f);
int operator = (buf.readUnsignedByte() & 0xf0) << 4;
operator += buf.readUnsignedByte();
buf.readUnsignedByte(); // reason data
buf.readUnsignedByte(); // reason
buf.readUnsignedByte(); // mode
buf.readUnsignedInt(); // IO
operator <<= 8;
operator += buf.readUnsignedByte();
position.set("operator", operator);
buf.readUnsignedInt(); // ADC
buf.readUnsignedMedium(); // Odometer
buf.skipBytes(6); // multi-purpose data
buf.readUnsignedShort(); // gps fix
buf.readUnsignedByte(); // location status
buf.readUnsignedByte(); // mode 1
buf.readUnsignedByte(); // mode 2
position.setValid(buf.readUnsignedByte() >= 3); // satellites
// Location data
position.setLongitude(buf.readInt() / Math.PI * 180 / 100000000);
position.setLatitude(buf.readInt() / Math.PI * 180 / 100000000.0);
position.setAltitude(buf.readInt() * 0.01);
position.setSpeed(UnitsConverter.knotsFromMps(buf.readInt() * 0.01));
position.setCourse(buf.readUnsignedShort() / Math.PI * 180.0 / 1000.0);
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.SECOND, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
time.set(Calendar.YEAR, buf.readUnsignedShort());
position.setTime(time.getTime());
return position;
}
return null;
}
}
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