Hoping to revive this thread. I'm getting NWEndpoint from NWBrowser and trying to force IPv4. let parameters = NWParameters.udp parameters.includePeerToPeer = true (parameters.defaultProtocolStack.internetProtocol! as! NWProtocolIP.Options).version = .v4 But checking to see if parameters.defaultProtocolStack.internetProtocol! as! NWProtocolIP.Options).version == .v4 returns false. It doesn't seem to be setting the version as expected. I checked and it remains as any. It seems like NWProtocolUDP.Options() and NWProtocolTLS.Options() initializers exist but NWProtocolIP.Options does not have an init exposed so I can't try setting params.defaultProtocolStack.internetProtocol = NWProtocolIP.Options() // and set version on options before assigning here

Looks like it was updated to HMMatterHome in iOS 15.2

I just tried out iOS beta 4 and XCode beta 4 and this is no longer an issue. Thank you for the fix!

I'm encountering the same issue. iOS 15 beta, tvOS 15 beta, and matter/chip profiles are installed on both devices. Failed to add and set up accessories for topology: Error Domain=HMErrorDomain Code=48 "(null)"