Program: 155959
Project: 155959
Buggy source:
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  ChannelBuffer buf=(ChannelBuffer)msg;
  buf.skipBytes(1);
  String manufacturer=buf.readBytes(2).toString(StandardCharsets.US_ASCII);
  buf.skipBytes(1);
  int idLength=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)'*') - buf.readerIndex();
  String id=buf.readBytes(idLength).toString(StandardCharsets.US_ASCII);
  DeviceSession deviceSession=getDeviceSession(channel,remoteAddress,id);
  if (deviceSession == null) {
    return null;
  }
  buf.skipBytes(1);
  String index=null;
  if (idLength > 10) {
    int indexLength=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)'*') - buf.readerIndex();
    index=buf.readBytes(indexLength).toString(StandardCharsets.US_ASCII);
    buf.skipBytes(1);
  }
  buf.skipBytes(4);
  buf.skipBytes(1);
  buf.writerIndex(buf.writerIndex() - 1);
  int contentIndex=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)',');
  if (contentIndex < 0) {
    contentIndex=buf.writerIndex();
  }
  String type=buf.readBytes(contentIndex - buf.readerIndex()).toString(StandardCharsets.US_ASCII);
  if (contentIndex < buf.writerIndex()) {
    buf.readerIndex(contentIndex + 1);
  }
  if (type.equals("String_Node_Str")) {
    sendResponse(channel,manufacturer,id,index,"String_Node_Str");
  }
 else   if (type.equals("String_Node_Str")) {
    sendResponse(channel,manufacturer,id,index,"String_Node_Str");
    if (buf.readable()) {
      String[] values=buf.toString(StandardCharsets.US_ASCII).split("String_Node_Str");
      if (values.length >= 3) {
        Position position=new Position(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());
        getLastLocation(position,null);
        position.set(Position.KEY_BATTERY_LEVEL,Integer.parseInt(values[2]));
        return position;
      }
    }
  }
 else   if (type.equals("String_Node_Str") || type.equals("String_Node_Str") || type.equals("String_Node_Str")|| type.equals("String_Node_Str")|| type.equals("String_Node_Str")) {
    if (type.equals("String_Node_Str")) {
      sendResponse(channel,manufacturer,id,index,"String_Node_Str");
    }
    Parser parser=new Parser(PATTERN_POSITION,buf.toString(StandardCharsets.US_ASCII));
    if (!parser.matches()) {
      return null;
    }
    Position position=new Position(getProtocolName());
    position.setDeviceId(deviceSession.getDeviceId());
    position.setTime(parser.nextDateTime(Parser.DateTimeFormat.DMY_HMS));
    position.setValid(parser.next().equals("String_Node_Str"));
    position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
    position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.DEG_HEM));
    position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
    position.setCourse(parser.nextDouble(0));
    position.setAltitude(parser.nextDouble(0));
    position.set(Position.KEY_SATELLITES,parser.nextInt(0));
    position.set(Position.KEY_RSSI,parser.nextInt(0));
    position.set(Position.KEY_BATTERY_LEVEL,parser.nextInt(0));
    position.set(Position.KEY_STEPS,parser.nextInt(0));
    int status=parser.nextHexInt(0);
    position.set(Position.KEY_ALARM,decodeAlarm(status));
    if (BitUtil.check(status,4)) {
      position.set(Position.KEY_MOTION,true);
    }
    decodeTail(position,parser.next());
    return position;
  }
 else   if (type.equals("String_Node_Str")) {
    sendResponse(channel,manufacturer,id,index,"String_Node_Str");
  }
 else   if (type.equals("String_Node_Str") || type.equals("String_Node_Str")) {
    if (buf.readable()) {
      Position position=new Position(getProtocolName());
      position.setDeviceId(deviceSession.getDeviceId());
      getLastLocation(position,new Date());
      position.setValid(false);
      String pulse=buf.toString(StandardCharsets.US_ASCII);
      position.set("String_Node_Str",pulse);
      position.set(Position.KEY_RESULT,pulse);
      return position;
    }
  }
 else   if (type.equals("String_Node_Str")) {
    Position position=new Position(getProtocolName());
    position.setDeviceId(deviceSession.getDeviceId());
    getLastLocation(position,null);
    int timeIndex=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)',');
    buf.readerIndex(timeIndex + 12 + 2);
    position.set(Position.KEY_IMAGE,Context.getMediaManager().writeFile(id,buf,"String_Node_Str"));
    return position;
  }
 else   if (type.equals("String_Node_Str")) {
    Position position=new Position(getProtocolName());
    position.setDeviceId(deviceSession.getDeviceId());
    getLastLocation(position,null);
    position.set(Position.KEY_AUDIO,Context.getMediaManager().writeFile(id,buf,"String_Node_Str"));
    return position;
  }
  return null;
}

Fixed version (ground truth):
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  ChannelBuffer buf=(ChannelBuffer)msg;
  buf.skipBytes(1);
  String manufacturer=buf.readBytes(2).toString(StandardCharsets.US_ASCII);
  buf.skipBytes(1);
  int idLength=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)'*') - buf.readerIndex();
  String id=buf.readBytes(idLength).toString(StandardCharsets.US_ASCII);
  DeviceSession deviceSession=getDeviceSession(channel,remoteAddress,id);
  if (deviceSession == null) {
    return null;
  }
  buf.skipBytes(1);
  String index=null;
  if (idLength > 10) {
    int indexLength=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)'*') - buf.readerIndex();
    index=buf.readBytes(indexLength).toString(StandardCharsets.US_ASCII);
    buf.skipBytes(1);
  }
  buf.skipBytes(4);
  buf.skipBytes(1);
  buf.writerIndex(buf.writerIndex() - 1);
  int contentIndex=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)',');
  if (contentIndex < 0) {
    contentIndex=buf.writerIndex();
  }
  String type=buf.readBytes(contentIndex - buf.readerIndex()).toString(StandardCharsets.US_ASCII);
  if (contentIndex < buf.writerIndex()) {
    buf.readerIndex(contentIndex + 1);
  }
  if (type.equals("String_Node_Str")) {
    sendResponse(channel,manufacturer,id,index,"String_Node_Str");
  }
 else   if (type.equals("String_Node_Str")) {
    sendResponse(channel,manufacturer,id,index,"String_Node_Str");
    if (buf.readable()) {
      String[] values=buf.toString(StandardCharsets.US_ASCII).split("String_Node_Str");
      if (values.length >= 3) {
        Position position=new Position(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());
        getLastLocation(position,null);
        position.set(Position.KEY_BATTERY_LEVEL,Integer.parseInt(values[2]));
        return position;
      }
    }
  }
 else   if (type.equals("String_Node_Str") || type.equals("String_Node_Str") || type.equals("String_Node_Str")|| type.equals("String_Node_Str")|| type.equals("String_Node_Str")) {
    if (type.equals("String_Node_Str")) {
      sendResponse(channel,manufacturer,id,index,"String_Node_Str");
    }
    return decodePosition(deviceSession,buf.toString(StandardCharsets.US_ASCII));
  }
 else   if (type.equals("String_Node_Str")) {
    sendResponse(channel,manufacturer,id,index,"String_Node_Str");
  }
 else   if (type.equals("String_Node_Str") || type.equals("String_Node_Str")) {
    if (buf.readable()) {
      Position position=new Position(getProtocolName());
      position.setDeviceId(deviceSession.getDeviceId());
      getLastLocation(position,new Date());
      position.setValid(false);
      String pulse=buf.toString(StandardCharsets.US_ASCII);
      position.set("String_Node_Str",pulse);
      position.set(Position.KEY_RESULT,pulse);
      return position;
    }
  }
 else   if (type.equals("String_Node_Str")) {
    Position position=new Position(getProtocolName());
    position.setDeviceId(deviceSession.getDeviceId());
    getLastLocation(position,null);
    int timeIndex=buf.indexOf(buf.readerIndex(),buf.writerIndex(),(byte)',');
    buf.readerIndex(timeIndex + 12 + 2);
    position.set(Position.KEY_IMAGE,Context.getMediaManager().writeFile(id,buf,"String_Node_Str"));
    return position;
  }
 else   if (type.equals("String_Node_Str")) {
    Position position=new Position(getProtocolName());
    position.setDeviceId(deviceSession.getDeviceId());
    getLastLocation(position,null);
    position.set(Position.KEY_AUDIO,Context.getMediaManager().writeFile(id,buf,"String_Node_Str"));
    return position;
  }
  return null;
}