---
title: "start(completion:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclusteroperationalstate/start(completion:)"
---

# start(completion:)

## Declaration

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

```swift
func start() async throws -> MTROperationalStateClusterOperationalCommandResponseParams
```