P2p iPad Android LAN

How to do video peer to peer on Android and iPad .without internet.?

We can also use a computer if needed.

I don’t see settings other than disable peer to peer which means nothing.

I want to connect two devices in the same building using a portable wifi router (hotspot) with no internet. We are using for meditation interviews with our teacher to prevent contact. Internet is slow, troublesome and currently being used.

Myanmar.