---
title: "readAttributeFeatureMap(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusterotasoftwareupdaterequestor-35vsy/readattributefeaturemap(completionhandler:)"
---

# readAttributeFeatureMap(completionHandler:)

## Declaration

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

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