@NotNull
  public static Bootstrap nioClientBootstrap(@NotNull EventLoopGroup eventLoopGroup) {
    Bootstrap bootstrap = new Bootstrap().group(eventLoopGroup).channel(NioSocketChannel.class);
    bootstrap.option(ChannelOption.TCP_NODELAY, true).option(ChannelOption.SO_KEEPALIVE, true);
    return bootstrap;
  }
@NotNull
  public static Bootstrap nioClientBootstrap(@NotNull EventLoopGroup eventLoopGroup)