Missing SSID:s seen with other devices

#1

I bought a couple of Rock 4 SE due to the RPI shortage (have lots of RPI:s and other devices) to solve a problem of bridging a AIR ventilation device that only has a separate wifi access and built in webserver to my regular network. I’m able to connect to that SSID with all other devices i have tried with (iphone, android, ubuntu laptop etc, RPI3,4…) but the Rock doesn’t list the SSID (but it list probably twice as many neighbouring and seems to have good radio). I have also tried to just add the SSID + pass explicitly but failed.

The Ventilation is a 2.4GHz only device and the SSID has a space in it “TAGE 84f703c62458”. Not sure if that can be causing some issue.

The Rock is running latest Ubuntu 20 server downloaded from https://www.okdo.com/software-hub/ . Of course i can take the easy way out and put the Rocks into the closet and use RPI:s instead. A bit annoyed that the only problem i wanted to solve failed and i don’t usually give up but i’m out of ideas and googling. Anyone that has ideas on what might cause this or have similar expereinces?

#2

Perhaps its relatd to this:

And rather start with Armbian. OS quality is higher then official “Ubuntu” builds.

#3

Ok, thanks. When reading the getting started i got the impression that in order to run headless and ssh it was Ubuntu server that was the only option.

I now downloaded the latest armbian (Rock 4C) jammy but i get the same SSID list as before. Again it hears a lot more SSID:s in the neighbourhood but not the one that i want and is visible simultaneously on my Ubuntu 22.04 laptop. Weird…

#4

OMG!.. From igorp:s link above: "This is a known problem with broadcom wl driver and channel 13. Change the channel or give up. "

Yes, the ventilation is running on channel 13 and there is no way for me to change it. This was fun…

#5

Yes, that is the problem. WiFi channels are not the same in every county and defaults might not be right.