Can you provide some documentation on the USBX CDC/ACM class library you started using in WICED version 3.5.2? There is no reference to it in the USBX Guide published by Express Logic. I am interested in particular in how to use its functions (_ux_host_class_cdc_acm_activate, _ux_host_class_cdc_acm_configure, etc.).
Presently the platform that supports USB has not been released. Hence documentation is not completed.
Also I just google'd and found this : http://documentation.renesas.com/doc/products/renesas-synergy/doc/r11um0007eu0570_synergy.pdf