might it be simpler to hack/bypass the FTDI device - and simply communicate Uart to Uart?
The LPC2388 is ideal for multi-purpose serial communication applications.
AVR280 USB Host CDC Demonstration (Application Note, 14 pages, revision A, updated 09/07)
The aim of this document is to describe how to start and implement a Host CDC application using the STK525 or USBKEY starter kit, and finally introduces a simple example of dual USB-UART bridge between two PCs.
We already provide a CDC Virtual Com Port Example
Hope this helps you.
Regarding USB Host and OTG stacks for the STM32 Connectivity Line, we are working with many partners and third parties
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