Wi-Fi direct 连接步骤

Wi-Fi direct

Wi-Fi direct

Wi-Fi direct is a wireless standard that allows devices to connect with each other without requiring a wireless access point. Wi-Fi Direct negotiates the link with a Wi-Fi Protected Setup (WPS) system that assigns each device a limited wireless access point.

Establishing a peer-to-peer (P2P) link has the following phases:

• P2P discovery, which allows to search for P2P devices in the vicinity
• P2P group formation, a P2P group is formed with the identification of one of the devices as group owner. A device can either become group owner (GO) autonomously if configured to do so or it can be negotiated between devices with the exchange of GO intents.
• P2P provisioning, which authenticates the link by using either Push Button Configuration (PBC) or PIN authentication.
• P2P connection, when the connection between a Group Owner (GO) and a Group Client (GC) is actually established.

The QCA6564 driver on load creates a p2p0 interface that is used by the wpa supplicant for P2P group formation. Once a group is formed, virtual p2p-p2p0-N interfaces are created, where N is an index starting at 0. These virtual interfaces are then used for provisioning.

Note Remember:

• Group additions, find and connect operations happen on the p2p0 interface
• Provisioning happens on the virtual p2p-p2p0-N interfaces

By default the Wi-Fi Direct functionality in the ConnectCore 6UL is disabled. To enable it, configure your Digi Embedded Yocto project by adding the following lines to your conf/local.conf file:

WLAN_P2P_INTERFACE = "p2p0"                                                        
WLAN_P2P_AUTO = "1" 

The above will configure the /etc/network/interfaces file with a p2p0 interface and will start a wpa-supplicant instance with a default /etc/wpa_supplicant_p2p.conf configuration file.

The following examples will use two ConnectCore 6UL devices to establish P2P connections. For more information about the wpa-supplicant P2P specific commands refer to this document.

Autonomous GO creation

Create Autonomous Group Owner (GO) and join using PBC method

Peer (GO) ---- PBC --- Peer (GC)

Steps	Peer 1	Peer 2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4		p2p_connect pbc join
5	Ctrl-c to exit	Ctrl-c to exit
6	wpa_cli -i p2p-p2p0-0 wps_pbc
7	ifconfig p2p-p2p0-0	ifconfig p2p-p2p0-0
8	ping	ping

Create Autonomous GO and join using PIN from GO

Peer (GO) ---- PIN --- Peer (GC)

Steps	Peer 1	Peer 2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4	Ctrl-c to exit
5	wpa_cli -ip2p-p2p0-0 wps_pin any (shows )
6		p2p_connect join
7		Ctrl-c to exit
8	ifconfig p2p-p2p0-0	ifconfig p2p-p2p0-0
9	ping	ping

Create Autonomous GO and join using PIN from GC

Peer (GO) ---- PIN --- Peer (GC)

Steps	Peer 1	Peer 2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4		p2p_connect pin join (shows )
5	Ctrl-c to exit	Ctrl-c to exit
6	wpa_cli -ip2p-p2p0-0 wps_pin any
7	ifconfig p2p-p2p0-0	ifconfig p2p-p2p0-0
8	ping	ping

Create Autonomous GO and invite GC using PBC

Peer (GO) ---- PBC --- Peer (GC)

Steps	Peer 1	Peer 2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4	p2p_invite group=p2p-p2p0-0 peer=
5		p2p_connect pbc join
6	Ctrl-c to exit	Ctrl-c to exit
7	wpa_cli -i p2p-p2p0-0 wps_pbc
8	ifconfig p2p-p2p0-0	ifconfig p2p-p2p0-0
9	ping	ping

Negotiated GO

Negotiate GO and join using PIN

Peer (GO | GC) ---- PIN --- Peer (GO | GC)

Steps	Peer 1	Peer 2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_find
3		p2p_find
4	p2p_connect pin go_intent=1
5		p2p_connect go_intent=15
6	Ctrl-c to exit	Ctrl-c to exit
7	ifconfig p2p-p2p0-0	ifconfig p2p-p2p0-0
8	ping	ping

Negotiate GO and join using PBC

Peer (GO | GC) ---- PBC --- Peer (GO | GC)

Steps	Peer 1	Peer 2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_find
3		p2p_find
4	p2p_connect pbc go_intent=1
5		p2p_connect pbc go_intent=14
6	Ctrl-c to exit	Ctrl-c to exit
7	ifconfig p2p-p2p0-0	ifconfig p2p-p2p0-0
8	ping	ping