The VisionOS certainly responded to the proximity of a laptop. My guess would be if you wanted to integrate with room environment I would look at the iBeacons.

I found new to me documentation on how to build a pass for Wallet. It had this detail which looks like what I want to work on. https://developer.apple.com/documentation/walletpasses/pass/nfc?language=objc I need to finish up a pressing project but I will definitely dig into this as my next project. This should work. I can already unlock the my doors with my phone it just runs through a series of keys before it sends a matching key. I think I just need to establish which key belongs to my building so that there are fewer errors or turn off the beep on failure...

I had the same problem and did what was mentioned in [Macports ticket #61866] trac.macports.org/ticket/61866) Which was to edit /opt/local/libexec/macports/lib/port1.0/portconfigure.tcl I searched for sdk_version and made the following changes to hard code 11.3.(by this time this was the version of Xcode I had upgraded to to install 11.2) default configure.sdk_version   {11.3} #default configure.sdk_version   {$macosx_sdk_version}      This cleared up the error message. I have no idea if it was a good idea.