Dig a little deeper: https://developers.google.com/android/reference/com/google/android/gms/fido/common/Transport https://developers.google.com/android/referen

Dig a little deeper: https://developers.google.com/android/reference/com/google/android/gms/fido/common/Transport https://developers.google.com/android/reference/com/google/a... I suppose USB support might need integration on the operating system level, whereas NFC and BLE can be integrated through Play Services. It's a start.