Arduino and Steam Link

Hello
I'm trying to use serial connection between Arduino and Steam Link
Steam Link has custom kernel linux on it (SDK: GitHub - ValveSoftware/steamlink-sdk)
The device has mdev and there is some kind of serial support in the kernel
Dmesg messages: Imgur: The magic of the Internet
LSUSB:

lsusb

Bus 001 Device 002: ID 0424:2514
Bus 001 Device 001: ID 1d6b:0002
Bus 001 Device 003: ID 28de:1142
Bus 001 Device 006: ID 2341:0043
Bus 001 Device 004: ID 058f:6387

The board is only detected on /dev/bus/usb and I can't mount it to /dev/ttyACM to use as serial port
What should I do?
Thanks for help

dzingishan:
The board is only detected on /dev/bus/usb and I can't mount it to /dev/ttyACM to use as serial port
What should I do?

Ask the Steam Link folks?

...R