1.3 Overview
WFDA2A is based on WFP2P [WF-P2P1.2] and WFSimple [WF-WSC2.0.2] and uses vendor-specific information elements (IEs) from these standards definitions to discover similar applications and to exchange connection information in a wireless environment.
In a Wi-Fi Direct (WFD) application-to-application scenario, the server application listens for connection requests from client applications. The server and client’s role determination for L3 is based on a listener intent value exchanged during establishment of the L2 connection.
WFDA2A uses a portion of the pre-shared key (PSK) during establishment of the L2 connection to confirm the connection. Setting up a connection between proximate devices requires three steps:
Advertising and searching for devices
Establishing a connection
Confirming the connection