---
title: AccessoryMessage.Error.transportUnavailable
framework: accessorytransportextension
role: symbol
role_heading: Case
path: accessorytransportextension/accessorymessage/error/transportunavailable
---

# AccessoryMessage.Error.transportUnavailable

An error indicating the transport is unavailable.

## Declaration

```swift
case transportUnavailable
```

## Discussion

Discussion The system attempts delivery on a different transport if available when you return this error.

## See Also

### Identifying error types

- [AccessoryMessage.Error.transportFailed](accessorytransportextension/accessorymessage/error/transportfailed.md)