Function send_loop 

async fn send_loop<W>(
    writer: W,
    state: Arc<Mutex<TransportState>>,
    rx: Receiver<Message>,
    countdown: Countdown,
) -> Result<(), NetworkError>
where
    W: AsyncWrite + Unpin,

Consume messages to be delivered to remote parties and send them.

The function automatically splits large messages into chunks that fit into a noise package.