---
title: Accessory Transport Extension
framework: Accessory Transport Extension
role: collection
role_heading: Framework
platforms: [iOS 26.2+]
path: accessorytransportextension
---

# Accessory Transport Extension

Transfer data securely to connected accessories that you develop.

## Overview

Overview Use the Accessory Transport Extension framework to securely transfer information to an accessory that you develop. First, establish a connection with your accessory using AccessorySetupKit. Then, you can share Wi-Fi networks with your accessory using Wi-Fi Infrastructure, or forward iOS system notifications to your accessory using Accessory Notifications. For information about automatic routing of audio to accessories, see AudioAccessoryKit. important: This framework is available only for iOS. The framework ignores calls for apps built with Mac Catalyst, and iOS apps that run on visionOS or on Macs with Apple silicon. You can develop and test an app that uses this framework on devices in any region. Customer installations of your app can only use the framework on devices located in the EU that are signed in with an Apple Account with an EU country or region. Share a Wi-Fi network with an accessory Implement the AccessoryTransportAppExtension protocol in an extension to share Wi-Fi networks with your accessory. The system calls your extension’s accept(sessionRequest:) method when it’s ready to start. After accepting the session request, your extension connects to the accessory using ASAccessorySession and delivers Wi-Fi network data using WINetworkSharingProvider. Forward iOS system notifications to an accessory Using the Accessory Transport Extension framework with Accessory Notifications, your app can receive iOS system notifications to send alerts to people on a connected accessory that you develop. The workflow requires three extensions to maintain security and encapsulation. Implement AccessoryDataProvider to receive and curate the content of a given notification. The system encrypts the notification data using keys you provide in your AccessoryTransportSecurity extension. Then, the system delivers the encrypted data to your AccessoryTransportAppExtension for transmission to the accessory. Your transport extension sends the encrypted data to your accessory, but is unable to decipher the notification’s content.

## Topics

### Wi-Fi network sharing

- [AccessoryTransportAppExtension](accessorytransportextension/accessorytransportappextension.md)
- [AccessoryTransportExtensionConfiguration](accessorytransportextension/accessorytransportextensionconfiguration.md)
- [AccessoryTransportSession](accessorytransportextension/accessorytransportsession.md)
- [Wi-Fi Infrastructure](wifiinfrastructure.md)

### Notification forwarding

- [Receiving iOS notifications on an accessory](accessorytransportextension/receiving-ios-notifications-on-an-accessory.md)
- [Forwarding notifications to your accessory using the internet transport type](accessorytransportextension/forwarding-notifications-to-your-accessory-using-the-internet-transport-type.md)
- [AccessoryDataProvider](accessorytransportextension/accessorydataprovider.md)
- [AccessoryDataProviderConfiguration](accessorytransportextension/accessorydataproviderconfiguration.md)
- [AccessoryTransportSecurity](accessorytransportextension/accessorytransportsecurity.md)
- [AccessoryTransportSecurityConfiguration](accessorytransportextension/accessorytransportsecurityconfiguration.md)
- [Accessory Notifications](accessorynotifications.md)

### Data and sessions

- [AccessoryFeature](accessorytransportextension/accessoryfeature.md)
- [AccessoryMessage](accessorytransportextension/accessorymessage.md)
- [AccessorySecuritySession](accessorytransportextension/accessorysecuritysession.md)
- [TransportMessage](accessorytransportextension/transportmessage.md)
- [SecurityMessage](accessorytransportextension/securitymessage.md)
- [AccessoryTransport](accessorytransportextension/accessorytransport.md)

### Protocols

- [AccessoryFeatureSession](accessorytransportextension/accessoryfeaturesession.md)