For anyone with the same problem, I had to explicitly set the Privacy - Local Network Usage Description key in the Info section:
https://developer.apple.com/videos/play/wwdc2020/10110
I assumed without setting this property a default splash screen would appear (which it did). However, even accepting this default dialogue did not seem to enable local network discovery.
pultar
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Thank you for the quick answer!
I added the missing code in the library and have a minimal example for iOS or macOS:
https://github.com/pultar/Melatonin
The code works in the simulator and can wake up a PC but not on device (neither my phone or my Mac). I call the library function here:
https://github.com/pultar/Melatonin/blob/93ca9f7e38eb16e88df8d2e300f3041b50132172/Melatonin/View/ComputerView.swift#L57