Hi Christian, I am trying to save times in communication between the firmware and the host. The host application is sending CMD_POLL every 10 ms: nBytes = usb_control_msg(x->dev_handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, CMD_POLL, 0, 0, (char *)buffer, sizeof(buffer), 10); The fir...