Wi-Fi direct

WiFi 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.

By default, Digi Embedded Yocto configures the WiFi Direct functionality by adding a p2p0 interface in /etc/network/interfaces. The interface is not automatically brought up.

The following instructions show how to configure the device to use Wi-Fi Direct.

1. Delete the wlan1 interface to make sure we can assign a virtual MAC address to the interface p2p-p2p0-0 that will be created new. To delete the interface wlan1, use the following command.

# iw dev wlan1 del

2. Bring up the p2p0 interface.

# ifup p2p0

The following examples will use two ConnectCore 6UL devices to establish P2P connections. For more information about the wpa-supplicant P2P specific commands, see the wpa_supplicant and Wi-Fi P2P readme.

Autonomous GO creation

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

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

Steps	Peer CC6UL1	Peer CC6UL2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4		p2p_connect <CC6UL1_go_mac_addr> 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 <CC6UL1_ip_addr>	ifconfig p2p-p2p0-0 <CC6UL2_ip_addr>
8	ping <CC6UL2_ip_addr>	ping <CC6UL1_ip_addr>

Create Autonomous GO and join using PIN from GO

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

Steps	Peer CC6UL1	Peer CC6UL2
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 <pin>)
6		p2p_connect <cc6ul_go_mac_addr> <pin> join
7		Ctrl-c to exit
8	ifconfig p2p-p2p0-0 <CC6UL1_ip_addr>	ifconfig p2p-p2p0-0 <CC6UL2_ip_addr>
9	ping <CC6UL2_ip_addr>	ping <CC6UL1_ip_addr>

Create Autonomous GO and join using PIN from GC

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

Steps	Peer CC6UL1	Peer CC6UL2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4		p2p_connect <cc6ul_go_mac_addr> pin join (shows <pin>)
5	Ctrl-c to exit	Ctrl-c to exit
6	wpa_cli -ip2p-p2p0-0 wps_pin any <pin>
7	ifconfig p2p-p2p0-0 <CC6UL1_ip_addr>	ifconfig p2p-p2p0-0 <CC6UL2_ip_addr>
8	ping <CC6UL2_ip_addr>	ping <CC6UL1_ip_addr>

Create Autonomous GO and invite GC using PBC

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

Steps	Peer CC6UL1	Peer CC6UL2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_group_add
3		p2p_find
4	p2p_invite group=p2p-p2p0-0 peer=<CC6UL2_mac_addr>
5		p2p_connect <CC6UL1_go_mac_addr> 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 <CC6UL1_ip_addr>	ifconfig p2p-p2p0-0 <CC6UL2_ip_addr>
9	ping <CC6UL2_ip_addr>	ping <CC6UL1_ip_addr>

Note For any of these methods, if you want to use the 5GHz frequency, issue p2p_group_add freq=5180 in step two.

Negotiated GO

Negotiate GO and join using PIN

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

Steps	Peer CC6UL1	Peer CC6UL2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_find
3		p2p_find
4	p2p_connect <CC6UL2_go_mac_addr> pin go_intent=1
5		p2p_connect <CC6UL1_go_mac_addr> <pin> go_intent=15
6	Ctrl-c to exit	Ctrl-c to exit
7	ifconfig p2p-p2p0-0 <CC6UL1_ip_addr>	ifconfig p2p-p2p0-0 <CC6UL2_ip_addr>
8	ping <CC6UL2_ip_addr>	ping <CC6UL1_ip_addr>

Negotiate GO and join using PBC

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

Steps	Peer CC6UL1	Peer CC6UL2
1	wpa_cli -ip2p0	wpa_cli -ip2p0
2	p2p_find
3		p2p_find
4	p2p_connect <CC6UL2_go_mac_addr> pbc go_intent=1
5		p2p_connect <CC6UL1_go_mac_addr> pbc go_intent=14
6	Ctrl-c to exit	Ctrl-c to exit
7	ifconfig p2p-p2p0-0 <CC6UL1_ip_addr>	ifconfig p2p-p2p0-0 <CC6UL2_ip_addr>
8	ping <CC6UL2_ip_addr>	ping <CC6UL1_ip_addr>

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