Thank you! That worked!

Apparently, not all of Matter. If I only import HomeKit, I get the error Cannot find 'MTRSetupPayload' in scope

Thank you for the explanation. The sample code linked for resolving a service uses NSNetService, which is deprecated. Am I correct that the only non-deprecated API to resolve a service is in fact DNSServiceResolve ?

This does not sound like it's the intended way either …