---
title: "readAttributeUniqueID(completion:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterbasicinformation/readattributeuniqueid(completion:)"
---

# readAttributeUniqueID(completion:)

## Declaration

```swift
func readAttributeUniqueID(completion: @escaping @Sendable (String?, (any Error)?) -> Void)
```

```swift
func readAttributeUniqueID() async throws -> String
```