Please check the i.MX Android Wi-Fi Display Sink API Introduction document for WFD on Realtek 8723AS Wi-Fi SDIO module usage with KK4.4.2. document can be downloaded from the doc bundle package:
Hope this helps
I am interested in Android 4.3.
I have custom hardware based on Freescale IMX6q, successfully running WFD shink.
But I want to check WFD source functionality.. which is not working..