Projector Pilot finds your projector on your own network - no cloud account, no pairing code. Put your phone on the same Wi-Fi, add the projector once, and the app scans what it can do and remembers it. Here is the whole flow.
Open Add Projector and pick how you want to find it. Both routes end at the same place.
If you add by IP, you need the projector's address on your network. Every Epson exposes it in the same place.