---
title: "readAttributeNullableStruct(completion:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterunittesting/readattributenullablestruct(completion:)"
---

# readAttributeNullableStruct(completion:)

## Declaration

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

```swift
func readAttributeNullableStruct() async throws -> MTRUnitTestingClusterSimpleStruct
```