Azure function WebPubSubTrigger never fired

Question

I am learning WebPubSub, and tried an azure function as following

    [FunctionName("Function1")]
    public static async Task Run(
        [WebPubSubTrigger("NewsHub2", WebPubSubEventType.User, "message")] 
        UserEventRequest request, BinaryData data, WebPubSubDataType dataType,
        ILogger log)
    {
        log.LogInformation(request.DataType.ToString());
        log.LogInformation(request.Data.ToString());
    }

I have added nuget package and WebPubSubConnectionString, the function starts up in debug without any errors, however, it will never fired, as I sending message using another console app

    static async Task Main(string[] args)
    {
        // Console.WriteLine("Hello World!");

        var connectionString = "Endpoint=https://XXXXXXXXXXXXXXXXX";
        var hub = "NewsHub2";
        var message = $"Test Info {DateTime.UtcNow}";

        // Either generate the token or fetch it from server or fetch a temp one from the portal
        var serviceClient = new WebPubSubServiceClient(connectionString, hub);
        await serviceClient.SendToAllAsync(message);
    }

From other client, I can clear see the message has been sent to everyone ...

Any help is highly appreciated!

Answer 1

How do you configure the Event Handler in Web PubSub service side? The function will be triggered when there's client message through client WebSocket connection.
Client --> Service -->(Event Handler) --> Server/Function -->(REST API) Service --> Clients

See HERE to work with function bi-direction communication sample. And another simpler notification sample doesn't need event handler can be checked HERE which is doing similar things like your console app.

Your second console app is working as a server that directly sends messages through Rest API. So event handler is not needed.
Server --> Service --> Clients

Besides, there's general Reference Doc about Function extensions. Please take a look to understand how's it working.

Answer 2

I figured out later, the message is for point to point communication and will NOT fire azure function, in order to fire azure function you will need event not message, and then in the azure function you can capture specific event name with metadata associated with it.