<!--
{
  "availability" : [
    "iOS: 26.5.0 -",
    "iPadOS: 26.5.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AccessoryLiveActivities",
  "identifier" : "/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/activate(for:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Accessory Live Activities"
    ],
    "preciseIdentifier" : "s:23AccessoryLiveActivities0B18ActivityForwardingC0abC7HandlerP8activate3foryAC7SessionC_tF"
  },
  "title" : "activate(for:)"
}
-->

# activate(for:)

Establishes communication between the data provider extension and the system.

```
func activate(for session: LiveActivityForwarding.Session)
```

## Parameters

`session`

A session object that enables communication between your accessory’s data provider extension and the system.

## Overview

Store a reference to the session and use it to receive life-cycle events and updates to ongoing Live Activities. The session becomes invalid after the
system calls [`sessionInvalidated()`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/sessionInvalidated()) to indicate that the system won’t deliver Live Activities to your accessory. Don’t use the session after invalidation.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)