---
title: "handleBDXTransferSessionBegin(forNodeID:controller:fileDesignator:offset:completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrotaproviderdelegate/handlebdxtransfersessionbegin(fornodeid:controller:filedesignator:offset:completionhandler:)"
---

# handleBDXTransferSessionBegin(forNodeID:controller:fileDesignator:offset:completionHandler:)

## Declaration

```swift
optional func handleBDXTransferSessionBegin(forNodeID nodeID: NSNumber, controller: MTRDeviceController, fileDesignator: String, offset: NSNumber, completionHandler: @escaping @Sendable ((any Error)?) -> Void)
```

```swift
optional func handleBDXTransferSessionBegin(forNodeID nodeID: NSNumber, controller: MTRDeviceController, fileDesignator: String, offset: NSNumber) async throws
```