App running under lock screen with StreamSocket and SpeechSynthesizer

On wp8 silverlight this was easy. PhoneApplicationService.Current.ApplicationIdleDetectionMode = IdleDetectionMode.Disabled;
In 8.1 xaml how would I go about this? I have found an ugly hack online that keeps the screen alive, this is not a solution that I can use. My users need to start my app, select a car transponder that they want to hear lap times from, connect to my server
(over wifi to a local computer running my server code, no internet) hit the lock button, then put their phones in their pockets while they drive and get the lap times on their earpiece.
I have the new and more cumbersome text-to-speech working (how you have to have an invisible media element on a the active page for mediaended to fire was especially annoying!). I have the streamsocket stuff working, just not under the lock screen. I don't
really need it to be a "background task". It is understood and preferable that it disconnects the moment you leave the page where get your live lap times.
controlchanneltrigger seemed promising, you can use it for store apps... but not phone.
To summarize.
1. connect to server with streamsocket api
2. lock screen and put phone in pocket
3. app should stay alive and as packets arrive from the server (one packet every 10 seconds on average), store lap time results and say them out loud using text to speech.
https://youtu.be/0VnOh6s3hww
At this point I'm pretty fed up and I'm about to pull the plug on the WP8.1 version, my first experience with xaml was... unpleasant... So if you have some good keywords I can search for that would be appreciated.

Hi torg,
The most similar API on Windows Phone 8.1 is
RequestActive | requestActive method, see this for more information: How to keep the display on during audio/video playback (XAML)
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App running under lock screen with StreamSocket and SpeechSynthesizer

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