Xamarin SignalR Connectivity with ASP.NET Core SignalR Hub

Junaid Shahid

7y1.8kLearn iOS Programming

In Xamrin SignalR show connection status "disconnected".

protected override async void OnAppearing()
{
base.OnAppearing();
connection = new HubConnectionBuilder()
.WithUrl("http://localhost:26523/chat")
.Build();
connection.On<string, string>("Send", (name, message) =>
{
SignalRResult.Text = name + " - " + message;
});
if (connection.State == HubConnectionState.Disconnected)
{
try
{
await connection.StartAsync(); // Not working
}
catch (Exception ex)
{
//messagesList.Items.Add(ex.Message);
}
}
}

I'm running the SignalR Hub in my local IIS. Web client working fine, Xamrin client not establishing connection.

11 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vincent Maverick Durano7y ago
Accepted answer
Can you explain why Web Hub locally not worked and online one is working?

Xamarin is a mobile app. Once you app is deployed to a device, your Hub in your local IIS isn't accessible. That's normal because your Hub lives in IIS and your Xamarin app lives in a device and there's a disconnected space between them. Your Hub should be hosted in a public facing address so it can connect to it. That's why it is working online.

Hope it makes sense.
+4
Junaid Shahid7y ago
Final Solution:

Open Inbound & Outbound Ports to access them via mobile in localhost.

Thanks to @Vincent for the idea.
0
Vincent Maverick Durano7y ago
No problem! glad to be of help. :)
0
Junaid Shahid7y ago
Yes you are right, to access IIS address from Mobile we have to user IP instead of LocalHost.

Anyways I accepted your answer, thanks for your quick support :)
0
Junaid Shahid7y ago
That's also not worked.

Here I have a working code.

https://github.com/mindofai/SignalRChat WEB (http://signalrdemomsph.azurewebsites.net/chatHub)
https://github.com/mindofai/Build2019Chat Xamarin

Xamarin working fine with online path, but not working with local IIS. Aslo the published site is not mine it's courtesy of https://mindofai.github.io/Building-a-Real-Time-Chat-App-With-SignalR-and-Xamarin/

Can you explain why Web Hub locally not worked and online one is working?
0
Junaid Shahid7y ago
May be you are right, from your point I got remember that when I was working with native android for login or to access domain I used to get Ip address instead of the url. Let me try and I back to you.
0
Vincent Maverick Durano7y ago
Are you running your Xamarin app locally to where you hosted your SignalR app locally? If you are running your app in a real device, then you need to make your Signal app is publicly accessible so it can be accessed outside your local.
+1
Junaid Shahid7y ago
Yes its working, I have web client getting messages but when try to connect xamarin hub connection is not established.
0
Vincent Maverick Durano7y ago
If you change the URL then have you tried accessing it via browser? Are you able to access it?
0
Junaid Shahid7y ago
I have do that, but still disconnected status.
0
Vincent Maverick Durano7y ago
When you deploy your app in IIS, the local port will change. You need to change the URL value to the actual URI after you deployed your app in IIS. In other words, change this URL:
http://localhost:26523/chat
To the actual URL registerted in IIS.
0