// UDP socket used for communication
let addr: SocketAddr = "127.0.0.1:0".parse()?;
let socket = tokio::net::UdpSocket::bind(addr).await?;

// QUIC connection
let conn = quiche::connect(None, &scid, local, peer, &mut config)?;

if conn.is_established() {
    // write to stream's send buffer
    conn.stream_send(stream_id, packet, false)?;
}

'send: loop {
    // write an outgoing packet each time, until `Done`
    let (len, send_info) = match { conn.send(&mut out_buf) } {
        Ok(v) => v,

        Err(quiche::Error::Done) => {
            break 'send;
        }

        Err(e) => {
            conn.close(false, 0x1, b"fail").ok();
            break 'send;
        }
    };

    // actually dispatch packet
    socket.send_to(&out_buf[..len], send_info.to).await?;
}