com.apple.developer.accessory-transport-extension
An entitlement that enables your app extension to send sensitive data to an accessory.
Discussion
If your app implements AccessoryTransportAppExtension, the framework requires the extension to have this entitlement with a value of true in its signature.
For more information, see Receiving iOS notifications on an accessory.
For information on adding entitlements to your app, see Adding capabilities to your app.