The check code wasn't running.
I don't know why !defined(TARGET_OS_IOS) would exclude code on
desktop macOS. I did a quick search and changed it to defined(TARGET_OS_MAC).
Not 100% sure what the most correct solution there is.
You can verify the old and new versions with
`ifconfig | grep temporary`
plus
`zerotier-cli info -j` -> listeningOn
This folder contains stuff that interfaces with the base operating system
like Phy for network access and the various OS-specific Ethernet tap
drivers.