Wi-Fi Direct

Wi-Fi Direct is a Wi-Fi standard that allows devices to connect with each other without requiring a Wi-Fi 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.

P2P interfaces

The AR6233 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-N interfaces are created, where N is an index starting at 0. These virtual interfaces are then used for provisioning.

  • Group additions, find, and connect operations happen on the p2p0 interface.

  • Provisioning occurs on the virtual p2p-N interfaces.

See Wireless virtual MAC addresses for more information. Configure the virtual interfaces before attempting to connect more than one device.

Enable P2P on the driver

The p2p0 interface is disabled by default to improve the performance of the wlan0 interface in client infrastructure mode.

Enable P2P

To do this, you must create a virtual interface with the following command:

~# iw dev wlan0 interface add p2p0 type managed

Now modify the /etc/network/interfaces and change the p2p0 interface as follows:

/etc/network/interfaces

auto p2p0
iface p2p0 inet static
        address 192.168.43.30
        netmask 255.255.255.0
        wpa-driver nl80211
        wpa-conf /etc/wpa_supplicant_p2p.conf

Now bring up the interface with the following command:

~# ifup p2p0

Manual P2P connection setup

The following examples will use two ConnectCore 6 devices to establish P2P connections. Before running any of the examples, bring up the p2p0 interface on both peers with:

~# ifup p2p0
The examples below use wpa-supplicant P2P-specific commands. For more information about these 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)
Step Peer CC61 Peer CC62

1

wpa_cli -ip2p0
wpa_cli -ip2p0

2

p2p_group_add

 

3

 

p2p_find

4

 

p2p_connect <CC61_mac_addr> pbc join

5

Ctrl+C to exit

Ctrl+C to exit

6

wpa_cli -i p2p-0 wps_pbc

 

7

ifconfig p2p-0 <CC61_ip_addr>
ifconfig p2p-0 <CC62_ip_addr>

8

ping <CC62_ip_addr>
ping <CC61_ip_addr>
Create Autonomous GO and join using PIN from GO
Peer (GO) ---- PIN --- Peer (GC)
Step Peer CC61 Peer CC62

1

wpa_cli -ip2p0
wpa_cli -ip2p0

2

p2p_group_add

 

3

 

p2p_find

4

Ctrl+C to exit

 

5

wpa_cli -ip2p-0 wps_pin any

(shows <pin>)

 

6

 

p2p_connect <CC61_mac_addr> <pin> join

7

 

Ctrl+C to exit

8

ifconfig p2p-0 <CC61_ip_addr>
ifconfig p2p-0 <CC62_ip_addr>

9

ping <CC62_ip_addr>
ping <CC61_ip_addr>
Create Autonomous GO and join using PIN from GC
Peer (GO) ---- PIN --- Peer (GC)
Step Peer CC61 Peer CC62

1

wpa_cli -ip2p0
wpa_cli -ip2p0

2

p2p_group_add

 

3

 

p2p_find

4

 

p2p_connect <CC61_mac_addr> pin join

(shows <pin>)

5

Ctrl+C to exit

Ctrl+C to exit

6

wpa_cli -ip2p-0 wps_pin any <pin>

 

7

ifconfig p2p-0 <CC61_ip_addr>
ifconfig p2p-0 <CC62_ip_addr>

8

ping <CC62_ip_addr>
ping <CC61_ip_addr>
Create Autonomous GO and invite GC using PBC
Peer (GO) ---- PBC --- Peer (GC)
Step Peer CC61 Peer CC62

1

wpa_cli -ip2p0
wpa_cli -ip2p0

2

p2p_group_add

 

3

 

p2p_find

4

p2p_invite group=p2p-0 peer=<CC62_mac_addr>

 

5

 

p2p_connect <CC61_mac_addr> pbc join

6

Ctrl+C to exit

Ctrl+C to exit

7

wpa_cli -i p2p-0 wps_pbc

 

8

ifconfig p2p-0 <CC61_ip_addr>
ifconfig p2p-0 <CC62_ip_addr>

9

ping <CC62_ip_addr>
ping <CC61_ip_addr>
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)
Step Peer CC61 Peer CC62

1

wpa_cli -ip2p0
wpa_cli -ip2p0

2

p2p_find

 

3

 

p2p_find

4

p2p_connect <CC62_mac_addr> pin go_intent=1

 

5

 

p2p_connect <CC61_mac_addr> <pin> go_intent=15

6

Ctrl+C to exit

Ctrl+C to exit

7

ifconfig p2p-0 <CC61_ip_addr>
ifconfig p2p-0 <CC62_ip_addr>

8

ping <CC62_ip_addr>
ping <CC61_ip_addr>
Negotiate GO and join using PBC
Peer (GO | GC) ---- PBC --- Peer (GO | GC)
Step Peer CC61 Peer CC62

1

wpa_cli -ip2p0
wpa_cli -ip2p0

2

p2p_find

 

3

 

p2p_find

4

p2p_connect <CC62_mac_addr> pbc go_intent=1

 

5

 

p2p_connect <CC61_mac_addr> pbc go_intent=14

6

Ctrl+C to exit

Ctrl+C to exit

7

ifconfig p2p-0 <CC61_ip_addr>
ifconfig p2p-0 <CC62_ip_addr>

8

ping <CC62_ip_addr>
ping <CC61_ip_addr>