Need to disable Airdrop Receiver for example apps to work in macOS Monterey

[jhillier]

I was having great trouble getting the example apps (starter and the full app) to work on macOS Monterey. Following the instructions exactly, I was getting a 403 error with no additional information. Turns out this is caused by Airdrop Receiver which uses port 5000. In order to get this working, you need to either disable Airdrop Receiver (System Preferences -> Sharing) or update the app to use a different port.