wlan0 not found error

[yujianyuanhaha]

greetings,

I once have successfully install and been able to collect CSI at summer. But when I want to setup some other device I notice the manual does not work for unknown reason. The issue is wlan0 not found error mention before @zeroby0

I tries three way the 5.4.51, 5.4.51+ and 4.19.97. But all of them has wlan0 not found error after reboot.

The way I tried but not work is try to used the old version like

...
git clone https://github.com/seemoo-lab/nexmon.git
git checkout 1ad6a82
...
git clone https://github.com/zeroby0/nexmon_csi.git
git checkout aa370c6
...

but it does not work either.

I also attached the install.sh and output.log for reference, the terminal does not pop any error all the way.

Best

Jet

[zeroby0]

Heyo Jet!

Can you post your uname -a? And also attach files created with journalctl -x | cat > journalctl.txt, dmesg > dmesg.txt. And also the exact commands you ran. Maybe post history | cat as both pi and root.

Does it happen immediately after you restart the Pi, or after you set any chanspec?

I'll setup a pi tomorrow or on Saturday to see if I'll get the same error

[yujianyuanhaha]

hi @zeroby0, I am following 5.41-plus version [https://github.com/nexmonster/nexmon_csi/tree/pi-5.4.51-plus]

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 5.4.51-v7+ #1333 SMP Mon Aug 10 16:45:19 BST 2020 armv7l GNU/Linux

And the loggoing .txt file are at debug folder

[zeroby0]

Soooo I installed Nexmon_csi on an SD card, and didn't get any errors. Did you set wifi country via raspi-config at the start?

Also, the wlan0 not found error is when you run nexutil, right?

[yujianyuanhaha]

@zeroby0 I do set raspi-config, and while wlan0 not found error come from ifconfig wlan0 up

[zeroby0]

Wanna try an alternative process with pre-compiled binaries? These are for the pi-5.4.51 branch. The install process takes less than a minute now 😆

Prepare Raspberry Pi

• Burn Raspbian Buster Lite 2020-08-20 onto an empty SD card. You can use Etcher.
• Create an empty file called ssh, without any extension, on the boot partition of the SD card.
• SSH into the Pi via Ethernet.
• With sudo raspi-config, set WiFi Country to US, set your Time Zone, and then Expand File System.
• Reboot when asked to.

  Install

• wget https://github.com/nexmonster/nexmon_csi/files/7662477/nexbin.tar.gz
• tar -xzvf nexbin.tar.gz
• cd nexbin
• sudo bash install.sh

Precompiled binaries: nexbin.tar.gz

[yujianyuanhaha]

@zeroby0 brilliant work, it works, thanks a lot.

Best

Jet

[dingyiyi0226]

Hi @zeroby0, I prepared the rpi and install by this solution

when i execute sudo bash install.sh, I get the following error at installing nexmon_csi step insmod: ERROR: could not insert module ./brcmfmac.ko: Invalid module format and wlan0 is still not found

How to handle this problem? Thanks

[mzakharo]

Ok, so latest rpi is supported now, stop using these extra solutions, go directly to https://github.com/seemoo-lab/nexmon_csi#bcm43455c0

[mzakharo]

just make sure to install python-is-python2

[zeroby0]

I haven't tested it yet, but I hope the 5.10 version on seemoo-lab/nexmon_csi is much more stable than the previous versions. I love having this repo, but it would be better for CSI research if there is one version that works perfectly. So please test the seemoo-lab/nexmon_csi repo if you're experiencing problems here. Let's slowly migrate people to the main repo.

I might package the 5.10 version's pre-compiled binaries though, just so people can install faster

[mzakharo]

faster installation can lead to errors. slow and steady wins the race

[haochenku]

Thank you @mzakharo , this new link works quite well on my raspberry pi. Great work. BTW, do you know which function in brcmfmac_4.19.y-nexmon folder is responsible for relaying the UDP packet to host/kernal 5500 port?

Thanks a lot.

[zeroby0]

I think this error is because either the driver or the firmware isn't loaded.

You can check by running lsmod | grep brcm. If you don't see brcmfmac in the output, the firmware hasn't been loaded. If brcmutil isn't present, it's the driver.

Try running modprobe brcmutil to load the driver. To load the firmware, insmod brcmfmac.ko in nexmon/patches/bcm43455c0/7_45_189/nexmon_csi/brcmfmac_5.4.y-nexmon folder. Or insmod brcmfmac.ko.orig to load the original firmware.

That said, there is a /lib/firmware/brcm/brcmfmac43455-sdio.bin file, and I don't know what it does, but it is overwritten by Nexmon_csi. So the roles of brcmfmac.ko and brcmfmac43455-sdio.bin aren't really clear to me.

[zeroby0]

@dingyiyi0226

when i execute sudo bash install.sh, I get the following error at installing nexmon_csi step insmod: ERROR: could not insert module ./brcmfmac.ko: Invalid module format

What is your kernel version, and which Raspberry Pi are you using?

[dingyiyi0226]

@zeroby0 kernel version: 5.4.51, Raspberry Pi 4B

[zeroby0]

I wonder if it's because I'm compiling on a Pi 3B+. I don't have a free Pi 4B available to compile or test right now.

@yujianyuanhaha did you run the binaries on a Pi 4B?

[avi3shake]

@dingyiyi0226 did you manage to solve the issue? I am getting the similar issue

[dingyiyi0226]

@avi3shake Yes. I followed the instruction on https://github.com/seemoo-lab/nexmon_csi#bcm43455c0 instead of using install.sh