Hi folks,
connecting any hearing device to iOS you almost have control to volume and programs of the hearing device via control panel.
So in most cases the official app of the hearing device manufacturer is not needed.
I assume for volume-program control there must be a general API to be exist, but I haven't found anything all over the developer documentation sites. I looked up Health-Kit., Accessebility-Kit, Bluethooth and so on as well Google&Co.
I'm wondering how Apple integrates this stuff...