UDP get exception when invoke bootstrap.BindAsync()

[jasmine999]

var group = new MultithreadEventLoopGroup();

        try
        {
            var bootstrap = new Bootstrap();
            bootstrap
                .Group(group)
                .Channel<SocketDatagramChannel>()
                .Option(ChannelOption.SoBroadcast, true)
                .Handler(new ActionChannelInitializer<IChannel>(channel =>
                {
                    channel.Pipeline.AddLast(new LoggingHandler("CONN"));
                    channel.Pipeline.AddLast("Quote", new QuoteOfTheMomentClientHandler());
                }));

            
            IChannel clientChannel = await bootstrap.BindAsync();

when invoke await bootstrap.BindAsync() will get exception:localAddress must be set beforehand

is it we can not invoke bootstrap.BindAsync() method without any parameters? if so, how can we let the system to random choose the ipaddress and port?

[yyjdelete]

You can use port 0 to bind with an random available port, but there is not option for ***random ipaddress **. IPAddress.Any will to bind on all you eth and loopback, IPAddress.Loopback for loopback only, (IPv6) for ipv6 only(ipv4 will also bind on ipv6 if Socket.DualMode is not set to false), and any special one ipaddress of you eth for single eth.

I'm not sure, but for boardcast with UDP, maybe you must special one ipaddress of you eth, and you can get them by

NetworkInterface.GetAllNetworkInterfaces().Where(ni => ni.OperationalStatus == OperationalStatus.Up).SelectMany(ni => ni.GetIPProperties().UnicastAddresses).ToArray()