Function drive_async 

pub async fn drive_async<'transport, 'request, 'writer, 'buffer, T>(
    transport: &'transport T,
    request: TransportRequest<'request>,
    response: &'writer mut ResponseWriter<'buffer>,
) -> Result<(), AsyncExecutionError<T::Error>>
where
    T: AsyncTransport + ?Sized,
    'transport: 'writer,
    'request: 'writer,
    'buffer: 'writer,

Drives one cross-thread async attempt and commits only after Ready(Ok).