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/*
* Copyright 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.Date;
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.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class EelinkProtocolDecoder extends BaseProtocolDecoder {
public EelinkProtocolDecoder(EelinkProtocol protocol) {
super(protocol);
}
private String readImei(ChannelBuffer buf) {
int b = buf.readUnsignedByte();
StringBuilder imei = new StringBuilder();
imei.append(b & 0x0F);
for (int i = 0; i < 7; i++) {
b = buf.readUnsignedByte();
imei.append((b & 0xF0) >> 4);
imei.append(b & 0x0F);
}
return imei.toString();
}
private static final int MSG_LOGIN = 0x01;
private static final int MSG_GPS = 0x02;
private static final int MSG_HEARTBEAT = 0x03;
private static final int MSG_ALARM = 0x04;
private static final int MSG_STATE = 0x05;
private static final int MSG_SMS = 0x06;
private static final int MSG_OBD = 0x07;
private static final int MSG_INTERACTIVE = 0x80;
private static final int MSG_DATA = 0x81;
private void sendResponse(Channel channel, int type, int index) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.buffer(7);
response.writeByte(0x67); response.writeByte(0x67); // header
response.writeByte(type);
response.writeShort(2); // length
response.writeShort(index);
channel.write(response);
}
}
@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.readShort(); // length
int index = buf.readUnsignedShort();
if (type != MSG_GPS && type != MSG_DATA) {
sendResponse(channel, type, index);
}
if (type == MSG_LOGIN) {
identify(ChannelBufferTools.readHexString(buf, 16).substring(1), channel);
}
else if (hasDeviceId() &&
(type == MSG_GPS ||
type == MSG_ALARM ||
type == MSG_STATE ||
type == MSG_SMS)) {
// Create new position
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocolName());
position.set(Event.KEY_INDEX, index);
// Location
position.setTime(new Date(buf.readUnsignedInt() * 1000));
position.setLatitude(buf.readInt() / 1800000.0);
position.setLongitude(buf.readInt() / 1800000.0);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
position.setCourse(buf.readUnsignedShort());
// Cell
position.set(Event.KEY_CELL, ChannelBufferTools.readHexString(buf, 18));
// Validity
position.setValid((buf.readUnsignedByte() & 0x01) != 0);
if (type == MSG_ALARM) {
position.set(Event.KEY_ALARM, buf.readUnsignedByte());
}
if (type == MSG_STATE) {
position.set(Event.KEY_STATUS, buf.readUnsignedByte());
}
return position;
}
/*
if (type == MSG_HEARTBEAT) {
if (channel != null) {
byte[] response = {0x54, 0x68, 0x1A, 0x0D, 0x0A};
channel.write(ChannelBuffers.wrappedBuffer(response));
}
}
else if (type == MSG_DATA) {
// Create new position
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("gt02");
position.set(Event.KEY_INDEX, index);
// Get device id
try {
position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
}
// Date and time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
position.setTime(time.getTime());
// Latitude
double latitude = buf.readUnsignedInt() / (60.0 * 30000.0);
// Longitude
double longitude = buf.readUnsignedInt() / (60.0 * 30000.0);
// Speed
position.setSpeed(buf.readUnsignedByte());
// Course
position.setCourse(buf.readUnsignedShort());
buf.skipBytes(3); // reserved
// Flags
long flags = buf.readUnsignedInt();
position.setValid((flags & 0x1) == 0x1);
if ((flags & 0x2) == 0) latitude = -latitude;
if ((flags & 0x4) == 0) longitude = -longitude;
position.setLatitude(latitude);
position.setLongitude(longitude);
return position;
}*/
return null;
}
}
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