# serial.flush

## Function

Flushes the output buffer of an open serial port.

## Syntax

```bt
device.open(config).flush()
```

## Parameters

No parameters.

## Return value

| Type | Description |
| ------ | ------ |
| Bool | Returns true if the refresh is successful. |

## Example

```bt
port = device.open({type: 'serial', port: 'COM3'})
result = port.flush()

// Output: true
print result
```

## Notes

- Throws an underlying device error on failure.