AccessorySetupKit

1. Essentials

   Covers Setting up and authorizing a Bluetooth accessory, Discovering and configuring accessories, ASAccessorySession.

2. Accessory discovery

   Covers ASAccessoryEvent, ASAccessoryEventType, ASDiscoveryDescriptor.

3. Accessory description

   Covers ASAccessory, ASDiscoveredAccessory, ASAccessory.AccessoryState.

4. Displaying picker items

   Covers ASPickerDisplayItem, ASDiscoveredDisplayItem, ASMigrationDisplayItem.

5. Information property list keys

   Covers NSAccessorySetupKitSupports, NSAccessorySetupBluetoothCompanyIdentifiers, NSAccessorySetupBluetoothNames, NSAccessorySetupBluetoothServices.

6. Errors

   Covers ASError, ASErrorDomain, ASError.Code.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.