WiFi-Display协议学习

Miracast依赖的WiFi技术有：

1. WiFi-Direct，即WiFi P2P
2. Wi-Fi Protected Setup：帮助用户自动配置WiFi网络，添加WiFi网络设备。
3. 11n/WMM/WPA2：其中，11n就是802.11n协议，它将11a和11g提供的Wi-Fi传输速率从56Mbps提升到300甚至600Mbps。WMM是Wi-Fi Multimedia的缩写，是一种针对实时视音频数据的QoS服务。而WPA2意为Wi-Fi Protected Acess第二版，主要用来给传输的数据进行加密保护。

WiFi Display连接步骤：

1. Establishment of WFD Connection using WiFi p2p
2. WFD Capability negotiation
3. HDCP Key negotiation

1. Establishing a WFD Connection using Wi-Fi P2P

After the establishment of a P2P group, WFD Devices perform WFD Capability Negotiation， Subsequently, the IP address of the P2P client is assigned by the GO。

TCP Connection：
The TCP connection shall be initiated by the WFD Sink. The WFD Source play