It's almost a one-liner!

```
fn main() {
    let api = hidapi::HidApi::new().expect("HidApi::new");

    api.device_list()
        .find(|d| d.product_string() == Some("rmk-mini") && d.interface_number() == 3)
        .expect("Device not found")
        .open_device(&api)
        .expect("open_device")
        .write(&[0x00, 0x0b]).expect("");
}
```