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

# readAttributeNullableStruct(completionHandler:)

## Declaration

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

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