azure-signalr | Azure SignalR Service SDK for .NET | Azure library

What's the role of your Azure Function? Do you still have Hub logics defined in your Web Apps?

When in Default mode, your Web App handles the lifetime of the clients, the SignalR service acts like a proxy that it routes all the client traffics through server connections to the Web App, while in Serverless mode, the SignalR service handles the lifetime of the clients. This article describes the differences in detail.

If you still have your Web App handle the clients in the Hub class, and Azure Function is simply used to send messages to these clients, please use Default mode.

So I figured out what was the issue it seems there were a package incompatibility between .net v4.7 and .net v4. I migrated all packages to following :

• package id="Microsoft.AspNet.SignalR" version="2.4.1" targetFramework="net48"
• package id="Microsoft.Azure.SignalR.AspNet" version="1.13.0" targetFramework="net48"
• package id="Microsoft.AspNet.SignalR.Client" version="2.4.2" targetFramework="net48"

Thank you all for your help.

Go to Diagnostics Settings under Monitoring tab in Azure portal SignalR service. Click on "Open Live Trace Tool" button. Click on Capture in newly opened window. When you run your application, all connections would be shown in Live Trace.

SignalR Service needs a URL to access Function App when you're using SignalR Service trigger binding. The URL format: /runtime/webhooks/signalr?code=. Explanation: The Function_App_URL can be found on Function App's Overview page and The API_KEY is generated by Azure Function. You can get the API_KEY from signalr_extension in the App keys blade of Function App.

And if you are very new to this, here is a step by step article to follow: https://github.com/aspnet/AzureSignalR-samples/tree/master/samples/BidirectionChat

I believe this should work:

Yes, there is no way to set it on azure portal. Not only 'Access-Control-Allow-Crendentials', but also many other config settings cannot set by using azure portal when you are based on linux web app.

To achieve that you want, you can use below cmd in powershell:(It works when you are based on azure web app. azure function is based on web app sandbox, so below cmd also works on function.)

I was using code from an answer from a different post I made and I didn't realize the observable answer changed the topic name or whatever. Not sure why the EventEmitter way didn't work, but once I adjusted it to newMessage it started working.

1. The service being a proxy basically means that it manages all of the client connections for you so you don't have to use a backplane to keep track of connected clients and which servers they are currently connected to yourself.

   Let's say that you have an application that you want to scale out by adding more servers to handle an increased number of client connections. The problem with scaling out is that each server only knows about its own client connections. It's unaware of connections to the other servers in the farm. This means that a message that you intend to send to all clients only goes out to the clients that are connected to the particular server that your hub is sending the message from.

   Using a backplane component, each server sends all messages to the backplane instead of sending them directly to its connected clients. The backplane is then responsible for forwarding the messages to the other servers.

2. HTTP/2 is not a replacement for web sockets and which one you should use depends on your requirements.

Yes, you can!

But not directly with Azure Functions. Because there is no SQL Trigger for Azure Functions (yet?)

So how you can achieve this?

By the power of Logic Apps!

There is a built-in SQL Server connector and its triggers. Please see the screenshot below:

You can either choose when an item is created, or when an item is modified.

Let's say you wanted an item is created trigger. Next, you need to give the connection string of the database to the connector. Then it will prompt you to select which Table to listen. (In the example below, it will check the "Menus" table every 30 seconds.

Afterwards, when the condition is matched, you can set up an "Action" with Azure Functions (or any other action you want, such as send an email with Outlook) and pass any parameter you want from the table. In the example above, I chose one of my Azure Functions and chose the HeartBeat function, and passed the IsActive, DateCreated and AvailableTimeTo columns from the "Menus" table.

Hope it helps 🤞🏼