Does screen mirroring, from a stock Android 9 phone (Moto X4 Android One edition), to AndroidTV, work, when you have no home internet service, and no mobile hotspot service? In other words:
- the ATV is disconnected from the internet,
- the mobile phone is connected to the internet by LTE, and
- Can the mobile phone beam its screen mirror directly to the ATV, over WiFi-Direct - no wifi router, just directly from the phone, straight over wifi-direct to the ATV?
You could get a cheap router and create a local network