Bluetooth classic

What are the requirements to allow use of bluetooth classic from an app (iPad and iPhone).
We develop GPS devices that comunicate using bluetooth classic. How do we enable the app to connect to our own bluetooth devices?

In theory there's a PDF presentation and a video in apple documentation: https://developer.apple.com/documentation/corebluetooth/using-core-bluetooth-classic.

But even though I'm trying to follow it I haven't been able to make it work yet.

Bluetooth classic
 
 
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