I have not found a way to set the Generic-Attiribute (0x1801) Service-Changed characteristic (0x2A05) to enable notifications.
From didDiscoverServices and didDiscoverCharacteristicsForService, I can see my custom services and characteristics, and BatteryService + DeviceInfoService just fine, but not the Generic-Attribute service.
I have read a relatively old posting which said that iOS filters out some well-known services...is this (still) true?
What is the general coding pattern (in swift) for setting "Service Changed" for notfications?
Is this action required by the central app, or does iOS BLE core do this automatically?
Thanks