Examples of io.netty.channel.socket.DatagramChannel.joinGroup()

            DatagramChannel datagramChannel = (DatagramChannel) channel;
            String networkInterface = configuration.getNetworkInterface() == null ? LOOPBACK_INTERFACE : configuration.getNetworkInterface();
            multicastNetworkInterface = NetworkInterface.getByName(networkInterface);
            ObjectHelper.notNull(multicastNetworkInterface, "No network interface found for '" + networkInterface + "'.");
            LOG.info("ConnectionlessBootstrap joining {}:{} using network interface: {}", new Object[]{configuration.getHost(), configuration.getPort(), multicastNetworkInterface.getName()});
            datagramChannel.joinGroup(hostAddress, multicastNetworkInterface).syncUninterruptibly();
            allChannels.add(datagramChannel);
        } else {
            LOG.info("ConnectionlessBootstrap binding to {}:{}", configuration.getHost(), configuration.getPort());
            ChannelFuture channelFuture = bootstrap.bind(hostAddress);
            channelFuture.awaitUninterruptibly();

        DatagramChannel cc = (DatagramChannel) cb.bind().sync().channel();


        String group = "230.0.0.1";
        InetSocketAddress groupAddress = new InetSocketAddress(group, addr.getPort());


        cc.joinGroup(groupAddress, NetUtil.LOOPBACK_IF).sync();


        sc.writeAndFlush(new DatagramPacket(Unpooled.copyInt(1), groupAddress)).sync();
        assertTrue(mhandler.await());


        // leave the group