First off is there a second app or can i install firmware on one camera to test and use them all on the same app? Is there a minimum size and card? And is it reversible?
It’s all in the same app, as long as you’re on beta. I’ve got one camera running RTSP with the rest on the main firmware. You should be able to flash back to normal firmware, as far as I know.
8gb enough? Or 16?
The demo.bin is only 10MB, so I think an 8GB card would be fine. You might as well spend the $10 and get a 32GB card, though, if for no other reason then to have a few days of continuous recording.