This appears to have worked, many thanks!Check your device's mute switch - we respect the mute switch for auto-playing audio but not for manually played audio.
Quietly removed, but not by choice - Apple marked a couple of the relevant programming interfaces as private APIs (I guess not a lot of people trying to run web servers on phones anymore) and so we were forced to remove them.It was definitely there in 3.2.64, and the latest 3.2.70 still has a setting for assigning a custom port, yet I can't find the feature anywhere. Is this a bug or a quietly removed feature?