/// HWI is the common Hardware Wallet Interface.
#[async_trait]
pub trait HWI: Debug {
fn device_type(&self) -> DeviceType;
/// Check that the device is connected but not necessarily available.
async fn is_connected(&self) -> Result<(), Error>;
/// Get master fingerprint.
async fn get_fingerprint(&self) -> Result<Fingerprint, Error>;
/// Get the xpub with the given derivation path.
async fn get_extended_pubkey(&self, path: &DerivationPath, display: bool) -> Result<ExtendedPubKey, Error>;
/// Register a new wallet policy
async fn register_wallet(&mut self, name: &str, policy: &str) -> Result<Option<[u8; 32]>, Error>;
/// Sign a partially signed bitcoin transaction (PSBT).
async fn sign_tx(&self, tx: &mut Psbt) -> Result<(), Error>;
}