---
title: "readAttributeNullableInt56u(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclustertestcluster/readattributenullableint56u(completionhandler:)"
---

# readAttributeNullableInt56u(completionHandler:)

## Declaration

```swift
func readAttributeNullableInt56u(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)
```

```swift
func readAttributeNullableInt56u() async throws -> NSNumber
```