Tip for anyone using Android with Spotify and not able to use steering wheel controls via BT.

Using Developer mode I changed my BT setting to from AVRCP 1.4 to AVRCP 1.3, steering wheel controls now work fine.

Hopefully this helps someone else.

Note: you will have to disable BT, change the setting, then enable BT again.

image showing the android setting

Also of interest, I was able to get the Android Mini Connected app working by using Developer Mode/USB debugging enabled. Useless app though..