The printer normally connects over USB using a virtual COM port, so it appears that I need to connect into the USB-OTG port on the Odroid C4.
We have compiled the Ubuntu Kernel with USB-OTG support and with the command:
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modprobe g_serial idVendor=0x0dd4 idProduct=0x8205
However, when I try to connect to the COM port using PUTTY on the Windows PC, I get the error "unable to open serial port".
Any ideas what I am missing?