---
title: DDDevice.Protocol.invalid
framework: DeviceDiscoveryExtension
role: symbol
role_heading: Case
path: devicediscoveryextension/dddevice/protocol-swift.enum/invalid
---

# DDDevice.Protocol.invalid

A default value for a device protocol.

## Declaration

```swift
case invalid
```

## See Also

### Indicating a device protocol

- [DDDevice.Protocol.dial](devicediscoveryextension/dddevice/protocol-swift.enum/dial.md)