Android Question Addmission OTG port

[Theera]

Refer to this, I'm creating CardReader .After I have used UsbSerial library for addmission OTG port ,but it can't see the serial port as following

Device Information

Manufacturer: Gen Product EMV
Serial not available
DeviceName: /dev/bus/usb/
001/002
DeviceClass:
USB_CLASS_PER_INTERFACE
(per-interface basis) DeviceSubClass: 0
Device ID: 0x3EA
Productld: 0x9540
Vendorld: 0x58F
B4aInterface Number: 0
InterfaceClass:
USB_CLASS_CSCID (smart card)
InterfaceSubClass: 0
Interface Protocol: 0
EndpointNumber: 1 EndpointDirection : In EndpointType:
USB_ENDPOINT_XFER_INT
(interrupt)
EndpointAttribute: 3
EndpointInterval: 1
EndpointMaxPacketSize: 4
OK

I don't know to solve this problem.

 

[Theera]

I have just found Thread 'MtpDevice library - Cameras and media players' https://www.b4x.com/android/forum/threads/mtpdevice-library-cameras-and-media-players.28575/
Perhaps, it helps me , but My reading English is not well.