Why don't Apple devices recognise the B922 / B924 over Bluetooth?

The B922 / B924 Bluetooth interface uses the Classic SPP (Serial Port Profile) - this is a standard method of replicating a wired serial connection and is used by many applications including Android, Windows, and Raspberry Pi.

Apple removed support for Bluetooth SPP from iOS, opting for a proprietary authentication method instead, so unfortunately the B922 / B924 are not recognised as Bluetooth devices.

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