---
title: clusterUnitTestingAttributeNullableCharStringID
framework: matter
role: symbol
role_heading: Type Property
path: matter/mtrattributeidtype/clusterunittestingattributenullablecharstringid
---

# clusterUnitTestingAttributeNullableCharStringID

## Declaration

```swift
static var clusterUnitTestingAttributeNullableCharStringID: MTRAttributeIDType { get }
```