Accessory Transport Extension

1. Wi-Fi network sharing

   Covers AccessoryTransportAppExtension, AccessoryTransportExtensionConfiguration, AccessoryTransportSession, Wi-Fi Infrastructure.

2. Notification and Live Activity forwarding

   Covers Receiving iOS notifications on an accessory, Receiving Live Activity updates and alerts on an accessory, Forwarding notifications to your accessory using the internet transport type, AccessoryDataProvider.

3. Transport messaging and security

   Covers AccessoryMessage, AccessorySecuritySession, TransportMessage, SecurityMessage.

4. Feature catalog

   Covers Accessory features.

5. Background work

   Covers Sending data to an accessory in the background, AccessoryWorker, AccessoryGPUWorker.

6. Protocols

   Covers AccessoryFeatureAuthorizing.

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