---
title: sessionID
framework: accessorytransportextension
role: symbol
role_heading: Instance Property
path: accessorytransportextension/transportmessage/sessionid
---

# sessionID

A unique identifier for the message’s capability session.

## Declaration

```swift
let sessionID: UUID
```

## Discussion

Discussion This identifier correlates messages with their capability (such as notifications or Live Activities). The system generates the session ID at feature enrollment time, and the value is fixed while the accessory remains paired through AccessorySetupKit.

## See Also

### Accessing message content

- [data](accessorytransportextension/transportmessage/data.md)