Function send_via_msg_sender 

async fn send_via_msg_sender<S, D>(
    msg_sender: &mut S,
    routing: DestinationRouting,
    data: D,
    error_context: &'static str,
) -> Result<()>
where
    S: Sink<(DestinationRouting, ApplicationDataOut)> + Unpin,
    S::Error: Error + Send + Sync + Clone + 'static,
    D: TryInto<ApplicationData>,
    D::Error: Error + Send + Sync + 'static,