AccessorySetupKit

What to open

• Use accessory-setup-kit/accessorysetupkit.md for all API details and key names.
• Use accessory-setup-kit/AccessorySetupKitEverythingBLEDevelopersNeedToKnow.md for BLE-specific behavior notes and real-world details.
• Search within it for: "Discovering and configuring accessories", ASAccessorySession, ASDiscoveryDescriptor, ASPickerDisplayItem, ASMigrationDisplayItem, ASPickerDisplaySettings, and ASAccessoryEventType.

Workflow

• Identify whether the accessory uses Bluetooth, Wi-Fi, or Wi-Fi Aware and set up matching discovery properties.
• Declare required Info.plist keys for AccessorySetupKit and any Bluetooth identifiers.
• Create and activate ASAccessorySession, then handle events on the provided queue.
• Present a picker with ASPickerDisplayItem items that match the accessories you support.
• Handle .accessoryAdded to connect to the selected device; handle .accessoryRemoved and .accessoryChanged as needed.

Picker guidance

• A display item must include a descriptor with a Bluetooth identifier or Wi-Fi SSID/SSID prefix.
• For Bluetooth filters, provide at least a service UUID or company identifier, and optionally a name substring or manufacturer/service data mask pair.
• To do custom filtering, enable filterDiscoveryResults and handle .accessoryDiscovered by creating ASDiscoveredDisplayItem entries, then call updatePicker(showing:completionHandler:).
• If custom filtering needs unlimited time, set discoveryTimeout = .unbounded and finish discovery with finishPickerDiscovery(completionHandler:).

Migration and post-setup

• Use ASMigrationDisplayItem to migrate previously-configured accessories into AccessorySetupKit.
• Use setup and rename options on picker items when the user should rename or finish setup in-app.

Reminders

• Keep discovery descriptors specific to avoid broad Bluetooth access.
• For Wi-Fi Aware, set Wi-Fi Aware properties on ASDiscoveryDescriptor before discovery.
• Use the session event stream to keep app state in sync with user actions.