[SOLVED] wifi p2p connection with wpa_supplicant: how to read/set password

dr_berta · 10-04-2023, 09:58 AM

Hello,
I created a p2p wifi connection between a pc with Ubuntu 20.04 and a pc with Win X without any internet connection using wpa_supplicant. The problem I have is that doing a new connection the password, generated by the command

Code:

wpa_cli -iwlan0 p2p_group_add

,changes and I'm not able to see it or export it.

The alternative could be to be able to set the password that will be used by the above command.
The standard way to set ssid and password for the network is not accepted as valid.

Is there someone that could suggest a way to do this?
Thanks
Claudio

michaelk · 10-04-2023, 12:25 PM

As far as I know Windows does not have peer to peer wireless ad-hoc capability. Configure it for internet connection sharing and then on Ubuntu use the network manager applet to configure a wireless network with the ssid and password from the Windows 10 computer.

dr_berta · 10-05-2023, 02:09 AM

You are right if you want to create the hotspot with windows, but in my case the hotspot is created in the Linux pc. Windows is able to detect the ad-hoc wifi connections if you set the correct ip address of the connection.

Claudio

michaelk · 10-05-2023, 04:38 AM

Network manager also has an internet connection sharing option that may work even if you only have one interface.

dr_berta · 10-05-2023, 04:45 AM

I tried it, but the ad-hoc connection created using Network Manager is not detected by Windows. For this reason I'm using wpa_supplicant.

Claudio

michaelk · 10-05-2023, 05:01 AM

Network manager should use wpa_supplicant as far as I know.

https://wiki.archlinux.org/title/ad-hoc_networking

dr_berta · 10-05-2023, 05:22 AM

I agree with you, NM should use wpa_supplicant in background without the need to specify any configuration for it, but what I'm seeing now is telling me something different.
Ad hoc connection made using network Manager between linux devices works fine.
But it seems that the ad-hoc connection created with Network Manager has not the requirements of a DIRECT-WIFi connection that windows is expecting.

I know that wpa_supplicant requires a specific command to setup a DIRECT-WIFI connection. Probaly this command is not used by NM

Claudio

dr_berta · 10-05-2023, 11:14 AM

I found the solution.
Googling a lot I finally found a document from the developer showing all the available p2p commands for wpa_supplicant.
One of them

Code:

p2p_get_passphrase

provides the password created for a p2p GO connection

Claudio