@BeforeClass
public static void createGroup() {
logger.info("Bandwidth: " + minfactor + " <= " + bandwidthFactor + " <= " + maxfactor +
" StepMs: " + stepms + " MinMs: " + minimalms + " CheckMs: " + check);
InternalLoggerFactory.setDefaultFactory(new Slf4JLoggerFactory());
Logger logger = (Logger) LoggerFactory.getLogger("ROOT");
logger.setLevel(Level.INFO);
group = new DefaultEventExecutorGroup(8);
groupForGlobal = new DefaultEventExecutorGroup(8);
}