When participating in a local net, the most important thing is to have a callsign. As for other rules, I think it's best to follow the arrangements made by the organizers. For example, if the first half hour is only for simulated operation with the repeater, and the second half hour can be used with the "Nanshan" app, that would be great. However, if you don't have a callsign, neither of these methods will work.