How to use A10-Lime Android USB host sockers?

[woj]

Hello!

I have problem with connection to the USB host socket in my Android application (A10-Lime). I am planning to use it as USB serial port to connect with my other project with FTDI chip on second side.
At the moment I cannot list the USB devices. I prepare an application which use USBManager.getDeviceList() according to the instruction:
https://developer.android.com/guide/topics/connectivity/usb/host#java
but every time I got empty list.

I tried also other application like FTDI example:
http://www.ftdichip.com/Android.htm
or UsbSerial library example:
https://github.com/felHR85/UsbSerial

And every time I got empty list. When I check logs using "dmesg" I see, that every device is recognized.

Could somebody give me hint?
Thanks in advance.
Woj