I bit the bullet and bought the app. It's working OK, except when I disconnected and reconnect it's not launching the app radio and only recognizing as HDMI display. Seems that I have to wait a bit before it shows the app radio icon on the main screen under "apps" .
I did disable the bluetooth toggle as it was messing with my bt radio connections. Not sure if that's why.
Edit... I tried it again and it launched once. I disconnected and reconnected and it won't launch at all now. I have rebooted the phone and headunit multiple times. I'm not sure how to manually trigger it to launch. I have the connect trigger set to HDMI, I have installed Nova launcher and set the launcher settings to nova in the app.
Here's what my app looks like (continuously says listening for connection and I can't trigger)
Here's what my headhunt looks like (it used to show the app radio badge)