I'm trying to go through the official tutorial for background task network in UWP titled Network communications in the background. However, since the tutorial is poorly ported from C++ code, the code, after being modified to be able to compile, fails at instantiating the ControlChannelTrigger object with an AccessDenied exception.
The exception is thrown at the following line.
channel = new ControlChannelTrigger(channelId, serverKeepAliveInterval,
ControlChannelTriggerResourceType.RequestHardwareSlot);
I read the comment about the lock screen and tried to add the app to the lock screen (even though this should no longer be a limitation), but the error persists.
I'm trying to maintain a persistent WebSocket connection with my own server to allow push notifications (I am aware of WNS, but it is not the right choice for my use-case).
My problem is similar to one in the related question ControlChannelTrigger in UWP Windows 10 access denied.
For simplicity, I am implementing everything as an in-process background task.
Can anyone suggest a solution or a workaround? Could the tutorial be outdated?
Unsurprisingly, I found the answer to my own question again.
The registered background task cannot be an in-process task and must be registered as an out-of-process task.
As for the Windows.Networking.Sockets.WebSocketKeepAlive entry point, I made a workaround by creating a background task that contained the Windows.Networking.Sockets.WebSocketKeepAlive and called its Run(…) method.