# Matter Functions ## Topics ### Functions [`func MTRAttributeNameForID(MTRClusterIDType, MTRAttributeIDType) -> String!`](/documentation/Matter/MTRAttributeNameForID(_:_:)) [`func MTRClusterNameForID(MTRClusterIDType) -> String!`](/documentation/Matter/MTRClusterNameForID(_:)) [`func MTRDeviceControllerStorageClasses() -> Set`](/documentation/Matter/MTRDeviceControllerStorageClasses()) [`func MTRSetMessageReliabilityParameters(NSNumber?, NSNumber?, NSNumber?, NSNumber?)`](/documentation/Matter/MTRSetMessageReliabilityParameters(_:_:_:_:)) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)