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 QCA6574 driver on load creates a p2p0 interface that is used by the wpa supplicant for P2P group formation. Once a group is formed, virtual {wifi-p2p-interface}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 {wifi-p2p-interface}N interfaces.
-
This configuration requires MAC addresses to be different and unique. Configure the virtual interfaces before attempting to connect more than one device.
The following instructions show how to configure the device to use Wi-Fi Direct. 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
The following examples will use two ConnectCore 6 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
| In kernel v4.9, peer-to-peer Autonomous Group Owner (Autonomous GO) configuration fails due to an incompatibility in the wireless driver. Digi recommends you use the Negotiated Group Owner (Negotiated GO) method. |
Create Autonomous Group Owner (GO) and join using PBC method
Peer (GO) ---- PBC --- Peer (GC)
| Steps | Peer CC61 | Peer CC62 |
|---|---|---|
1 |
wpa_cli -ip2p0 |
wpa_cli -ip2p0 |
2 |
p2p_group_add |
|
3 |
|
p2p_find |
4 |
|
p2p_connect <CC61_go_mac_addr> pbc join |
5 |
Ctrl-c to exit |
Ctrl-c to exit |
6 |
wpa_cli -i {wifi-p2p-interface}0 wps_pbc |
|
7 |
ifconfig {wifi-p2p-interface}0 <CC61_ip_addr> |
ifconfig {wifi-p2p-interface}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)
| Steps | 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 -i{wifi-p2p-interface}0 wps_pin any (shows <pin>) |
|
6 |
|
p2p_connect <CC61_go_mac_addr> <pin> join |
7 |
|
Ctrl-c to exit |
8 |
ifconfig {wifi-p2p-interface}0 <CC61_ip_addr> |
ifconfig {wifi-p2p-interface}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)
| Steps | Peer CC61 | Peer CC62 |
|---|---|---|
1 |
wpa_cli -ip2p0 |
wpa_cli -ip2p0 |
2 |
p2p_group_add |
|
3 |
|
p2p_find |
4 |
|
p2p_connect <CC61_go_mac_addr> pin join (shows <pin>) |
5 |
Ctrl-c to exit |
Ctrl-c to exit |
6 |
wpa_cli -i{wifi-p2p-interface}0 wps_pin any <pin> |
|
7 |
ifconfig {wifi-p2p-interface}0 <CC61_ip_addr> |
ifconfig {wifi-p2p-interface}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)
| Steps | Peer CC61 | Peer CC62 |
|---|---|---|
1 |
wpa_cli -ip2p0 |
wpa_cli -ip2p0 |
2 |
p2p_group_add |
|
3 |
|
p2p_find |
4 |
p2p_invite group={wifi-p2p-interface}0 peer=<CC62_mac_addr> |
|
5 |
|
p2p_connect <CC61_go_mac_addr> pbc join |
6 |
Ctrl-c to exit |
Ctrl-c to exit |
7 |
wpa_cli -i {wifi-p2p-interface}0 wps_pbc |
|
8 |
ifconfig {wifi-p2p-interface}0 <CC61_ip_addr> |
ifconfig {wifi-p2p-interface}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)
| Steps | Peer CC61 | Peer CC62 |
|---|---|---|
1 |
wpa_cli -ip2p0 |
wpa_cli -ip2p0 |
2 |
p2p_find |
|
3 |
|
p2p_find |
4 |
p2p_connect <CC62_go_mac_addr> pin go_intent=1 |
|
5 |
|
p2p_connect <CC61_go_mac_addr> <pin> go_intent=15 |
6 |
Ctrl-c to exit |
Ctrl-c to exit |
7 |
ifconfig {wifi-p2p-interface}0 <CC61_ip_addr> |
ifconfig {wifi-p2p-interface}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)
| Steps | Peer CC61 | Peer CC62 |
|---|---|---|
1 |
wpa_cli -ip2p0 |
wpa_cli -ip2p0 |
2 |
p2p_find |
|
3 |
|
p2p_find |
4 |
p2p_connect <CC62_go_mac_addr> pbc go_intent=1 |
|
5 |
|
p2p_connect <CC61_go_mac_addr> pbc go_intent=14 |
6 |
Ctrl-c to exit |
Ctrl-c to exit |
7 |
ifconfig {wifi-p2p-interface}0 <CC61_ip_addr> |
ifconfig {wifi-p2p-interface}0 <CC62_ip_addr> |
8 |
ping <CC62_ip_addr> |
ping <CC61_ip_addr> |
