start
fun start(context: Context, qrCode: String, docType: String, elements: Map<String, List<String>>, timeouts: ProximityTimeouts = ProximityTimeouts()): ProximityReaderSession(source)
Reads the holder's qrCode and starts a session asking for docType's elements (namespace → identifiers): it scans for the holder, or advertises for it, as the holder's QR code offers. It throws ProximityException for a missing permission, and WalletException (invalidInput) for a QR code it can't use.