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/*
* Copyright 2012 - 2015 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.charset.Charset;
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.Context;
import org.traccar.helper.BitUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
private boolean forceTimeZone = false;
private final TimeZone timeZone = TimeZone.getTimeZone("UTC");
public Gt06ProtocolDecoder(Gt06Protocol protocol) {
super(protocol);
if (Context.getConfig().hasKey(getProtocolName() + ".timezone")) {
forceTimeZone = true;
timeZone.setRawOffset(Context.getConfig().getInteger(getProtocolName() + ".timezone") * 1000);
}
}
public static final int MSG_LOGIN = 0x01;
public static final int MSG_GPS = 0x10;
public static final int MSG_LBS = 0x11;
public static final int MSG_GPS_LBS_1 = 0x12;
public static final int MSG_GPS_LBS_2 = 0x22;
public static final int MSG_STATUS = 0x13;
public static final int MSG_SATELLITE = 0x14;
public static final int MSG_STRING = 0x15;
public static final int MSG_GPS_LBS_STATUS_1 = 0x16;
public static final int MSG_GPS_LBS_STATUS_2 = 0x26;
public static final int MSG_GPS_LBS_STATUS_3 = 0x27;
public static final int MSG_LBS_PHONE = 0x17;
public static final int MSG_LBS_EXTEND = 0x18;
public static final int MSG_LBS_STATUS = 0x19;
public static final int MSG_GPS_PHONE = 0x1A;
public static final int MSG_GPS_LBS_EXTEND = 0x1E;
public static final int MSG_COMMAND_0 = 0x80;
public static final int MSG_COMMAND_1 = 0x81;
public static final int MSG_COMMAND_2 = 0x82;
private static boolean isSupported(int type) {
return hasGps(type) || hasLbs(type) || hasStatus(type);
}
private static boolean hasGps(int type) {
return type == MSG_GPS || type == MSG_GPS_LBS_1 || type == MSG_GPS_LBS_2
|| type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3
|| type == MSG_GPS_PHONE || type == MSG_GPS_LBS_EXTEND;
}
private static boolean hasLbs(int type) {
return type == MSG_LBS || type == MSG_LBS_STATUS || type == MSG_GPS_LBS_1 || type == MSG_GPS_LBS_2
|| type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3;
}
private static boolean hasStatus(int type) {
return type == MSG_STATUS || type == MSG_LBS_STATUS
|| type == MSG_GPS_LBS_STATUS_1 || type == MSG_GPS_LBS_STATUS_2 || type == MSG_GPS_LBS_STATUS_3;
}
private static void sendResponse(Channel channel, int type, int index) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(10);
response.writeByte(0x78); response.writeByte(0x78); // header
response.writeByte(0x05); // size
response.writeByte(type);
response.writeShort(index);
response.writeShort(Checksum.crc16(Checksum.CRC16_X25, response.toByteBuffer(2, 4)));
response.writeByte(0x0D); response.writeByte(0x0A); // ending
channel.write(response);
}
}
private void decodeGps(Position position, ChannelBuffer buf) {
DateBuilder dateBuilder = new DateBuilder(timeZone)
.setDate(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
.setTime(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
position.setTime(dateBuilder.getDate());
int length = buf.readUnsignedByte();
position.set(Event.KEY_SATELLITES, BitUtil.to(length, 4));
length = BitUtil.from(length, 4);
double latitude = buf.readUnsignedInt() / 60.0 / 30000.0;
double longitude = buf.readUnsignedInt() / 60.0 / 30000.0;
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
int flags = buf.readUnsignedShort();
position.setCourse(BitUtil.to(flags, 10));
position.setValid(BitUtil.check(flags, 12));
if (!BitUtil.check(flags, 10)) {
latitude = -latitude;
}
if (BitUtil.check(flags, 11)) {
longitude = -longitude;
}
position.setLatitude(latitude);
position.setLongitude(longitude);
if (BitUtil.check(flags, 14)) {
position.set(Event.KEY_IGNITION, BitUtil.check(flags, 15));
}
buf.skipBytes(length - 12); // skip reserved
}
private void decodeLbs(Position position, ChannelBuffer buf, boolean hasLength) {
int lbsLength = 0;
if (hasLength) {
lbsLength = buf.readUnsignedByte();
}
position.set(Event.KEY_MCC, buf.readUnsignedShort());
position.set(Event.KEY_MNC, buf.readUnsignedByte());
position.set(Event.KEY_LAC, buf.readUnsignedShort());
position.set(Event.KEY_CID, buf.readUnsignedMedium());
if (lbsLength > 0) {
buf.skipBytes(lbsLength - 9);
}
}
private void decodeStatus(Position position, ChannelBuffer buf) {
position.set(Event.KEY_ALARM, true);
int flags = buf.readUnsignedByte();
position.set(Event.KEY_IGNITION, BitUtil.check(flags, 1));
position.set(Event.KEY_STATUS, flags);
position.set(Event.KEY_POWER, buf.readUnsignedByte());
position.set(Event.KEY_GSM, buf.readUnsignedByte());
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
if (buf.readByte() != 0x78 || buf.readByte() != 0x78) {
return null;
}
int length = buf.readUnsignedByte(); // size
int dataLength = length - 5;
int type = buf.readUnsignedByte();
if (type == MSG_LOGIN) {
String imei = ChannelBuffers.hexDump(buf.readBytes(8)).substring(1);
buf.readUnsignedShort(); // type
// Timezone offset
if (dataLength > 10) {
int extensionBits = buf.readUnsignedShort();
int hours = (extensionBits >> 4) / 100;
int minutes = (extensionBits >> 4) % 100;
int offset = (hours * 60 + minutes) * 60;
if ((extensionBits & 0x8) != 0) {
offset = -offset;
}
if (!forceTimeZone) {
timeZone.setRawOffset(offset * 1000);
}
}
if (identify(imei, channel, remoteAddress)) {
buf.skipBytes(buf.readableBytes() - 6);
sendResponse(channel, type, buf.readUnsignedShort());
}
} else if (hasDeviceId()) {
if (type == MSG_STRING) {
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocolName());
getLastLocation(position, null);
int commandLength = buf.readUnsignedByte();
buf.readUnsignedByte(); // server flag (reserved)
position.set("command", buf.readBytes(commandLength - 1).toString(Charset.defaultCharset()));
buf.readUnsignedShort(); // language
sendResponse(channel, type, buf.readUnsignedShort());
return position;
} else if (isSupported(type)) {
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocolName());
if (hasGps(type)) {
decodeGps(position, buf);
} else {
getLastLocation(position, null);
}
if (hasLbs(type)) {
decodeLbs(position, buf, hasStatus(type));
}
if (hasStatus(type)) {
decodeStatus(position, buf);
}
if (type == MSG_GPS_LBS_1 && buf.readableBytes() == 4 + 6) {
position.set(Event.KEY_ODOMETER, buf.readUnsignedInt());
}
if (buf.readableBytes() > 6) {
buf.skipBytes(buf.readableBytes() - 6);
}
int index = buf.readUnsignedShort();
position.set(Event.KEY_INDEX, index);
sendResponse(channel, type, index);
return position;
} else {
buf.skipBytes(dataLength);
if (type != MSG_COMMAND_0 && type != MSG_COMMAND_1 && type != MSG_COMMAND_2) {
sendResponse(channel, type, buf.readUnsignedShort());
}
}
}
return null;
}
}
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