async fn inner_main() -> anyhow::Result<()> {
    let client: HostClient<WireError> = HostClient::new_raw_nusb(
        |d| d.serial_number() == Some("E4629076D33B0B22"),
        ERROR_PATH,
        64,
        VarSeqKind::Seq1,
    );
    let mut rng = thread_rng();

    for sz in [32, 64, 128, 256, 512, 768] {
        let mut data = vec![0u8; sz];
        rng.fill_bytes(&mut data);
        let data = UartFrame { data };
        let mib = 1;
        let count = (mib * 1024 * 1024) / sz;
        println!("Doing {count} pkts, {sz}B each ({mib}MiB total)");
        let start = Instant::now();
        let mut out = Vec::with_capacity(count);

        for _i in 0..count {
            // if (i % 1024) == 0 {
            //     println!("{i}");
            // }
            let resp = client.send_resp::<Loopback>(&data).await.unwrap();
            out.push(resp);
        }

        let taken = start.elapsed();
        println!("Took {taken:?}");
        for pkt in out {
            assert_eq!(pkt.data, data.data);
        }
        let mbps = (mib * 8) as f64 / taken.as_secs_f64();
        println!("{mbps:.02}mbps up + {mbps:.02}mbps down");
    }

    Ok(())
}