Wifi Direct GO Negotiation

Arend van Spriel arend at broadcom.com
Wed May 14 05:26:12 EDT 2014


On 14-05-14 05:03, Anand Moon wrote:
> Hi All,
> 
> I would like to add new question to this thread.
> 
> If the AP has the capability to support p2p and wps, how will 
> these two devices communicate with the AP. 
> Will this AP become P2P group owner (P2P Go) and the other devices P2P Clients ?

I am not sure whether this scenario makes sense. P2P typically involves
two STAs. They may be connected to some AP, but if both are connected to
the same AP there may be not so much need to setup a P2P connection.

> I would like to know how to judge if the wireless interface supports P2P
> is it with the "Supported interface modes" or "Supported RX frame types" ? 
> 
> If the device support following p2p mode then how do we need to configure them. 
> 
> Supported interface modes: 
>         * IBSS
>          * managed
>         * AP * AP/VLAN 
>         * monitor 
>         * mesh point 
>         * P2P-client 
>         * P2P-GO 
> 
> How do we configure these P2P modes for interface?
> Please share your thoughts.

Just use nl80211 API, ie. NL80211_CMD_SET_INTERFACE. wpa_supplicant is
doing that in src/drivers/driver_nl80211.c

Regards,
Arend

> -Anand Moon
> 
> 
> On Tuesday, May 13, 2014 6:31 PM, Arend van Spriel <arend at broadcom.com> wrote:
> On 05/13/14 14:03, Andrea Chittano wrote:
>> Hi, my name is Andrea.
>> I'm working on WiFi Direct and I found a thread about it.
>> I've some doubts about it.
>> Let's suppose we have 2 devices. Let's call D1 and D2.
>> Let's suppose D1 sends a request of connection to D2 (D1 doesn't known
>> D2 so no persistent connection there exist).
>> The first step that wpa_supplicant on D1 is to send a GO negotiation
>> request containing, among all,GO intent (of D1).
>> I want to understand how wpa_supplicant on D2 acquires the GO intent of
>> D2 in order to compare it with whichone sent by D1.
>> Can someone explain me this?
> 
> Both devices have their own go intent configuration in wpa_supplicant 
> configuration file. D2 sends own go intent value in the GO negotiation 
> response. The device with the highest GO intent will become GO.
> 
> Regards,
> Arend
> 
>> Thanks,
>> Andrea
>>
>>
>>
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> 
> 
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