CODEWITHSUNDEEP
c#socketswebsocketuwpbackground
Igor Ševo
Igor Ševo

Reputation: 5515

Using web sockets in UWP background tasks

I am trying to make a background task for a UWP app. The task should be triggered by packets from a web socket connection.

I have tested the web socket and it works as expected.

For the background task to work, according to the Microsoft tutorial on background networking (Network communications in the background), a ControlChannelTrigger must be instantiated and the channel.UsingTransport(socket) method must be called. Then socket.ConnectAsync(...) should be called.

However, when calling socket.ConnectAsync(...) after channel.UsingTransport(socket), the socket.ConnectAsync(...) method throws an exception with the following message.

Exception from HRESULT: 0x80072F75

When called without channel.UsingTransport(socket), the connection is established without problems.

In order to use the socket in a background task, I must establish the connection after calling channel.UsingTransport(socket).

Can anyone shed some light on why this error might be occurring?

Upvotes: 0

Views: 1016

Answers (1)

Breeze Liu - MSFT
Breeze Liu - MSFT

Reputation: 3808

Please don't install the IIS server on the same device and use localhost to connect the server. See network isolation topic. When using the server in official WebSocket sample , you can try to copy the server folder and its subfolder to another computer and run the server scripts, then you can connect the server with a IP address such as:

Server uri: ws://xxx.xx.xx.xx/WebSocketSample/echowebsocket.ashx

Besides, please have a try to test the ControlChannelTrigger StreamWebSocket sample.

Also see the Note part in the sample:

When used with the supplied scripts, this Windows Store app sample communicates with another process (IIS server which is a desktop app) on the same machine over loopback for demonstration purposes only. A Windows Store app that communicates over loopback to another process that represents a Windows Store app is not allowed and such apps will not pass Store validation. For more information, see How to configure network isolation capabilities.

Upvotes: 1

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