Hey @Jane, I am very keen and excited about your new app.
I am willing to help test and debug issues. I have just sent you an email with my details.
I have been using TVHeadend server for many years for watching live tv on various devices as well as recording tv shows/movies and playing them back.
I started off using low cost hardware (mostly raspberry pi's) and running the Tvheadend addon inside kodi, either in openelec/librelec or rasbian. Last year I purchased one of the google TV dongles and that seem to run okay using kodi. Very recently, I upgraded to a Google Streamer 4K box, thinking my experience would be better overall, as i ran out of storage space on the previous google TV dongle. However I have had nothing but problems with buffering/caching/streaming issues. From what I can determine, there seems to be a software/hardware issue with the Google streamer 4K and kodi doesn't play nice. Having said that, every other app installed on the 4K streamer works perfectly.
Yesterday I installed VLC on the 4K streamer and that seemed to work a bit better to stream recordings. I set up a DLNA/UPNP server to broadcast the recordings folders so that VLC can see the TVheadend recordings.
Anyway, very keen to test and try out your new app. The simple solution is often the best.