The stream to use for sending data to the accessory.
- iOS 3.0+
- macOS 10.13+
- Mac Catalyst 13.0+
- tvOS 10.0+
This stream is provided for you automatically by the session object but you must configure it if you want to receive any associated stream events. You do this by assigning a delegate object to the stream that implements the
stream(_: delegate method. You must then schedule the stream in a run loop so that it can send data asynchronously from one of your application’s threads.
For more information on how to schedule an output stream in a run loop and use it to send data, see Stream Programming Guide.