Example Server cannot connect to iOS device

[PhilippTUBerlin]

Hello,

I'm trying to connect some hardware to a raspberry pi 3 and connect the pi via bluetooth to an iPad (6th generation) app.
So far I'm using the example code without any modification, I can compile and run the server. On my Android phone I can see and connect to the server using the nRF Connect App.
On the iPad, however, the gobbledegook server never appears, I used BLE Scanner and my own Swift software and I can find all kinds of devices but not the gobbledegook server. It never gets even listed.
It seems that apple has some stricter rules on what Bluetooth devices they accept. I found the following link which explains some of these rules:
https://community.cypress.com/docs/DOC-14906
https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf
Unfortunately I don't know much about Bluetooth. Does anyone know what timings or services have to change in order for iOS to accept the BT server?

I guess it would be nice in general if the example code would also connect to iOS

Thank you for your help!

Philipp