Mvc application for a UDP listener

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I have a windows application that is working as a udp listener, I am trying to make it as a web application(MVC). the udp listener is running in a continues loop listening to the port all the time. is there any tutorials that I can use to convert this to a web application?

What I have tried:

I do not know how to trigger the controller inside the loop

Posted 19-Jan-22 11:47am

Prachith Goonasekara

Updated 19-Jan-22 12:27pm

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Dave Kreskowiak · Accepted Answer · 2022-01-19T12:27:00

Solution 1

You're going to have to go into more detail as to how you expect this app to work.

ASP.NET/MVC code (C#, VB.NET) runs entirely on the server, not the client. So, if your code is listening on a UDP port, it's the server that's doing the listening.

If you want examples of a UDP listener, you just have to Google for "C# udp listener".

Posted 19-Jan-22 12:27pm

Dave Kreskowiak

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Prachith Goonasekara 19-Jan-22 18:32pm

Hi Dave, thanks for the reply, Actually the listening part works. When I call the listener method from the controller, the loop starts working. But only concern that I have is to show those data in the view.

Dave Kreskowiak 19-Jan-22 18:42pm

Well, you picked a bad application type for that. The web server cannot push content to the clients. HTTP/HTTPS is a connect/request/response/disconnect paradigm. The client requests a page and the server responds with that page and forgets the client even exists.

You seem to be thinking in a single-user environment when you cannot do that in a web application. Web apps are multi-user (clients).

Think about it. If your server-side code makes a change to the data, how is the server going to be able to contact the client (or even which client to connect to) to send it the new page? Hint: it can't.

The server would have to update some kind of state information it holds onto, either in memory or in a database, and when the client requests a refreshed page, the server can send the updated data state.

Prachith Goonasekara 19-Jan-22 18:47pm

Yeah! thanks, that's what I was thinking as well, as all the changes to the data is happening in the server side and the client doesn't know about it. And a refresh from the client would not help. Anyway, thanks. So for something like this, webapps are not the solution right. :)

Prachith Goonasekara 19-Jan-22 18:52pm

Otherwise, update the dataset into a json file and direct that into the view

Dave Kreskowiak 19-Jan-22 18:53pm

...which the client still has to request.

Prachith Goonasekara 19-Jan-22 19:01pm

yeah, so then I can refresh only that frame continuously to grab the data right?

Dave Kreskowiak 19-Jan-22 19:07pm

Yes. There's a bunch of different ways of doing it if you're going to stick with a web app. But it all HTTP scenarios, the client must request a page.

Now if you went the route of a seperate channel for the data, like over SignalR or web sockets, you're not limited by HTTP. You have lots of other choices, but more complexity.

Prachith Goonasekara 19-Jan-22 19:15pm

I saw about signalIR in the searches, have no idea how that works though. But wont hurt on giving it a try if that sorts this out :D. Thank you so much for your inputs in this. :)