readIdentity method
Reads the identity characteristic (the peer ID bytes) of the device
that advertises token. The GATT connection this opens is kept for a
short time, so that a connect right after it does not connect again.
Implementation
@override
Future<Uint8List> readIdentity(String token, {Duration? timeout}) async {
await Future<void>.delayed(_network.latency);
return Uint8List.fromList(_find(token)._identity!);
}