[Buildroot] How to connect to Wifi on start-up using Buildroot?

[Peter Seiderer]

On Tue, 15 Mar 2022 21:00:54 +0100, Arnout Vandecappelle <arnout at mind.be> wrote:

> On 15/03/2022 14:05, Sourabh Hegde wrote:
> > Helllo Jan,
> > 
> > Thanks for the answer.
> > 
> >  From Buildroot 2021 release "ctrl_interface" is disabled and so I have   
> 
>   It's disabled unless BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE=y
> 
> > commented out below line in etc/wpa_supplicant.conf file
> > 
> > # |ctrl_interface=/var/run/wpa_supplicant|  
> 
>   This shouldn't be needed. AFAIK wpa_supplicant ignores the option if 
> CTRL_IFACE is not enabled.
> 
> > |
> > |
> > |And also in my rootfs, there is no "|/var/run/wpa_supplicant|" file.  
> 
>   The file (actually, named pipe) is created when wpa_supplicants starts up. 
> /var/run is a tmpfs so it can only be created at runtime.
> 
> > |
> > |
> > |
> > |I have set below options in menuconfig|
> > |
> > |
> > menuconfig.PNG
> > 
> > Then doing make clean & make results in below errors:
> >   
> >  >>> wpa_supplicant 2.10 Installing to staging directory  
> > /usr/bin/install -m 0644 -D 
> > /root/raspcm4/sources/output/build/wpa_supplicant-2.10/wpa_supplicant/libwpa_client.so 
> > /root/raspcm4/sources/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libwpa_client.so
> > /usr/bin/install: cannot stat 
> > '/root/raspcm4/sources/output/build/wpa_supplicant-2.10/wpa_supplicant/libwpa_client.so': 
> > No such file or directory
> > make[1]: *** [package/pkg-generic.mk:331 <http://pkg-generic.mk:331>: 
> > /root/raspcm4/sources/output/build/wpa_supplicant-2.10/.stamp_staging_installed] 
> > Error 1
> > make: *** [Makefile:23: _all] Error 2
> > 
> > Can you please let me know what could be the issue and how to resolve it?  
> 
>   I've tried to build the same configuration (with current git master) and it 
> builds without problems.

Problem introduced on buildroot git master with wpa_supplicant version bump [1] and
fixed with [2]...

Regards,
Peter

[1] https://git.buildroot.net/buildroot/commit/package/wpa_supplicant?id=39381a467cd2cfc15f77d3f9adbf329d2f92e312
[2] https://git.buildroot.net/buildroot/commit/package/wpa_supplicant?id=c4eebf191c781a3ea6b5eb1811cc17ae92ea2fb2

> 
>   Please supply the defconfig and also the full build log (by uploading to a 
> pastebin).
> 
>   Regards,
>   Arnout
> 
> 
> > 
> > Thanks in advance
> > ||
> > 
> > On Thu, 10 Mar 2022 at 19:03, Jan Havran <havran.jan at email.cz 
> > <mailto:havran.jan at email.cz>> wrote:
> > 
> >     Hi Sourabh,
> > 
> >     after enabling RPi firmware you must load the Wifi driver - since you are using
> >     systemd, it should by handled by udev on start I think.
> > 
> >     So you probably just need to configure /etc/network/interfaces to start
> >     wpa_supplicant
> >     on wlan0 with /etc/wpa_supplicant.conf file, where you can put your credentials.
> >     Or at least that is what I have done, but I am not using systemd.
> > 
> >     I did something similar some time ago, you can check it here:
> >     https://gitlab.com/sonicpp/gnss-pi/-/commit/caf0317c024e51fc7e322deacd09ec9346d47e26
> >     <https://gitlab.com/sonicpp/gnss-pi/-/commit/caf0317c024e51fc7e322deacd09ec9346d47e26>
> > 
> >     (note that to make "my" credentials public in that commit was an intention).
> > 
> >     P.S.: if you want to have any modifications to be part of your image with
> >     filesystem,
> >     you can do it by using rootfs overlays for example:
> >     https://buildroot.org/downloads/manual/manual.html#rootfs-custom
> >     <https://buildroot.org/downloads/manual/manual.html#rootfs-custom>
> > 
> >     Regards,
> > 
> >     Jan Havran
> > 
> >     V Thu, Mar 10, 2022 at 05:43:27PM +0100, Sourabh Hegde napsal(a):  
> >      > Hello All,
> >      >
> >      > I am trying to connect my Raspberry Pi CM4 to Wifi automatically after
> >      > start-up. I am using Buildroot based Linux distribution. I have worked with
> >      > Yocto before and it provides systemd-networkd and wpa_supplicant feature to
> >      > connect to wifi on boot. I am lloking something similar in Buildroot but
> >      > couldn't find any notes online.
> >      >
> >      > So far, I think I have enabled the necessary config/driver using "make
> >      > menuconfig" :
> >      > [image: wpa_supplicant.png]
> >      > [image: firmware.png]
> >      >
> >      > But now, how can I set-up wpa_supplicant.conf? Any link to notes or
> >      > suggestion would be helpful.
> >      >
> >      > Can anyone please let me know how to proceed further with it?
> >      >
> >      > Your help will be much appreciated.
> >      >
> >      > Thanks in advance.
> >      >
> >      > P.S: I am using Buildroot 2022.02 release and also using systemd feature
> >      > and let me know if any info is missing here.
> >      >
> >      > Regards,
> >      >
> >      > Sourabh  
> > 
> > 
> > 
> >   
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