I found an example in demo: QPOSService pos = QPOSService.getInstance(QPOSService.CommunicationMode.USB_OTG_CDC_ACM); S

If you are not using USB_OTG, you can use other communication modes supported by the QPOSService SDK. Here are some examples: - Bluetooth: `QPOSService.getInstance(QPOSService.CommunicationMode.BLUETOOTH)` - Audio Jack: `QPOSService.getInstance(QPOSService.CommunicationMode.AUDIO)` - TCP/IP: `QPOSService.getInstance(QPOSService.CommunicationMode.TCP_IP)` You can choose the appropriate communication mode based on your device and connection method.