Tried that, as well as a few other camera apps, none of them pick up anything. Nmap also says only ports 21 and 6789 are open, but none of the standard logins work on the ftp port and there doesnt seem to be anything standardised hosted on 6789. Found some long threads on other forums on these chinese camera's with the same issues, going to try some rtsp server scripts that can be run from an sd card.
I think you should be good if you order the same TC20 camera, even though the one i have looks identical and also uses the Yi Iot app, its another model (XY-3820) with no rtsp or onvif support. Also paid like R50 for mine, so its probably a cheaped out version with the same shell