This is a small demo using NetService (Bonjour) to send short messages from one app to another only by updating the bonjour TXT record.
It all started with a question in a CocoaHeads Sthlm slack channel. How to send a value from one device to another with cheapest-to-implement tech.
This example uses the TXT record in Bonjour to send and update from a Mac app to an iOS app. See the ViewControllers for the code to do this.
Have fun.