Thank you! And thanks for the suggestion.

we need mroe for signalR. Maybe u may say about how to store messages so every new client can connect and see messages when he was not avilable. Moreover same scenario just when particural user send to any other specific user like in the chat app like Whatsup.

How to send to specific clients would be great.

Track them when signal r connect, with a dictionary forexample user to connectio. Id, user roles to connection ids and so fourth. When you want to prodcast to admin get all admin "whom are connected" and send message to thwm

You can add the admins to a group and send whatever message to them. Or track admins with a database or dictionary

You are welcome.

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You are welcome.

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You are welcome.

What are you looking for in part 3?

@@IAmTimCorey Sorry, I was meaning to put that in reply to @Simnico99's (kzfaq.info/love/QRVFuD0t68EyxV8Hl0Ypfg) comment asking about "how to broadcast to only a certain amount of people like admins receiving notifications about something etc." It was not meant to be a top-level comment. ☺️

You are welcome.

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I mentioned it but I did not show it. That's a more complicated process that would have been too long to add to a video. It would need to be its own video.

@@IAmTimCorey Hi, thanks so much for answering. Actualy I've already done sending individual messages... had to find out how to do it on my own, but it would be a very good video to make. A whole series on SignalR. It's a very good tool with so many applications...

You are welcome.

@@IAmTimCorey Using Signal R how to display a driver locations on the map like uber ?

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Thanks!

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Yes you can!

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Probably just string constants, maybe in a shared library so that other projects can use the same constants. It won't solve all of the naming issues, though, since some are method names that then correspond to strings. For that, you might try "nameof()", but that might get hacky.

You can host your app anywhere with just 100 concurrent connections. That's not really a big deal. 10,000 would be where I would start looking for other solutions. However, if you want to offload your SignalR connections anyway, you could do so for $50/month if you hosted on East US: azure.com/e/62513f4b4772453ab8a051795e515784 Note that this plan covers 1,000 concurrent connections and gives you 1,000,000 messages for free before it starts charging you for additional messages.

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You are welcome.

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There isn't a part 3 scheduled. What would you like to see in a part 3?

It sounds like your emulator does not trust the certificate. Self-signing won't change that (you already have a self-signed certificate for your API). What you need to do is trust that certificate. That would be my guess.

Yes, they can share authentication. Yes, you can alert the clients from the server. You can't establish a connection from the server to the client, though. The client needs to be the one to establish a connection.

I think this is a confusion on network ports vs network connections. You can (and do) have multiple connections over one port. Web servers, for instance, usually use port 443 for serving a website, yet they can have more than one visitor at a time. A network card has roughly 65,000 ports that can be used simultaneously. For instance, on the same server you can be using FTP on port 21. With SignalR, you are using the web communication channel (usually port 443) for all communication. Inside of it, you can have multiple WebSocket connections at once. By default, IIS limits you to 5,000 connections per CPU, but you can increase that dramatically. The bottleneck, though, will be the server's ability to keep track of all of those links. Even the bandwidth won't really be a problem, since you usually send very small packets across the wire. 100,000 clients sending 1kb packets would only result in a 100MBps transfer rate. It is a rare business that cannot sustain that much traffic to their commercial site. That's why the bigger problem is the computer driving all of those changes at once. It will have a lot of bottlenecks trying to talk to 100,000 clients at once.

​@@IAmTimCorey You're right of course, excuse the brain fart! Thanks for the videos! I tried out gRPC per another of your videos to make a client/server app (both in winforms) so I could send keystrokes I hooked from a VMware guest to the host so my multimedia keys would function on my host. It took forever to figure that out because when your mouse is hovering over a VM window, VMware will hijack the keydown/up messages you want to send via SendMessage and send those messages back to the guest, creating an endless loop!. I finally figured that out, but ended up ditching gRPC and using SignalR because I got stuck on an issue with gRPC not working in Win7 VMs due to an http/ssl version issue I think. I figured I'd give SignalR a shot to learn a bit about it. I don't think I'll ever try gRPC again just because I didn't like the gotchas you warned us about, because they got me even after your warning.

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Yes, you can. You can also create a JavaScript client (no C#) or clients in other languages.

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Unit tests test just one unit of work. They don't test the interconnected system. It sounds like you are wondering about end-to-end testing. That can be a good thing, although it is tricky to get right, expensive to build, and it will be constantly changing. That means that you don't do it very often and you don't do many of them. The way to do it would probably be to spin up a full setup in Docker or something else where you can reset the environment easily. However, in this specific case, it sounds more like you are having a problem in production and need to track down what is going wrong. In that case, good logging is a better option. That way, you can read through the logs and identify what went wrong.

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InvokeAsync is needed when you know that the code might be executed on a background thread and the code modifies components/objects owned by the UI thread. Without InvokeAsync you will run into exceptions being thrown if you try to run StateHasChanged from a thread other than the main UI thread.

Running multiple devices on the same wifi network does not mean you can connect to other devices localhost. Each device has their own localhost, you can think of localhost as the current device itself. So your WPF application is trying to connect to a server running on that same specific device, but fails, because there is no server running on the WPF machine's localhost.

The best thing to do would be to publish your SignalR server to a web server. They are designed to be reachable by other machines on the network, or even across the Internet. You can set up your local machine to be a web server. This video will show you how: kzfaq.info/get/bejne/hraRpLmqp9HbfZ8.html Just note that you will then need to make sure your local machine's firewall permits access on the correct ports, plus you will need to add a SSL certificate on your local machine that the other machines trust, plus you will need to access your machine remotely using your machine's IP address. As @Diego pointed out, the word "localhost" represents the machine you are on. That doesn't work when you want to access a remote machine. In that case, you would access it by the IP address.

Sure. It can work with almost any client.

@@IAmTimCorey Thanks

I don’t have a GitHub link. There is a link in the description to download the source.

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I don't have an example of that yet, sorry.

@@IAmTimCorey Okay. I have been fighting with setting up Azure SignalR via a deployed API and connecting to receive messages via a JavaScript client. Talk about a headache.