Have you got any luck? I am stuck on the exact same stuff I just receive a UDP message that tells my app to which IP it should connect to for FTP transfer, now I am not getting it to work, it just stays there as I don't get any UDP message, but no local network popup is showing, I do only use the recvfrom function/method as well. @Hydroplosion, what's the SimplePing that you refer to?

@devil5000 @DevilDimon did you got the issue figured out? I am not able to make the popup appear, I have my com.apple.developer.networking.multicast entitlement approved and everything but still my app does not appears on the local network privacy settings nor does the popup comes up, I don't get any UDP message on iOS 14 even with the entitlement. It was working fine on iOS 13.