Implement any/all of the optional delegate protocols used to receive data from IDT_VP3300_Delegate:
func deviceConnected()
func deviceDisconnected()
func plugStatusChange(deviceInserted: Bool)
func dataInOutMonitor(data: NSData!, incoming isIncoming: Bool)
func deviceMessage(message: NSString!)
func lcdDisplay(mode: Int32, lines: [AnyObject]!)
func pinRequest(_ mode: EMV_PIN_MODE_Types, key: Data!, pan PAN: Data!, startTO: Int32, intervalTO: Int32, language: String!)
func emvTransactionData(emvData: IDTEMVData!, errorCode error: Int32)