Thank you all for yours input

What finally did work

if [[ -z VARIABLE1 && -z VARIABLE2 ]]; then
    echo "OK"
fi

If only Linux was using Python syntax that would be so much more intuitive…

not working, both variables do not exist and the echo "OK" do not trigger.

Thank you all for your input’s !

As I’m not familiar enough with BGP, AS etc…

I think I’ll go for the list generated by
https://github.com/lord-alfred/ipranges
https://github.com/sakib-m/IP-Prefix-List

To start with.

Then I’ll see if it’s possible to gather those IP ranges without relying on third party services…
but that seem unfeasible without be connect to a Internet Exchange Point (IXP) right ?

Thank you @WarmApplePieShrek@lemmy.dbzer0.com Are you sure your link is correct ? I get

This page does not seem to exist…

Thank you all for your input’s ! \

So I have created a table , that I’ll put in my first post.

Feel free to post update like

|brand|model|Price €|GPIO pair|CP|Lan Ports|idle watt|Surface area cm²|Storage ports| WiFi / BT|url|
|Raspberry Pi|Pi 5 B (4GB)|52|12|Quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz.|1x 1GbE|3|47|SD|||

or even without the row header

Thanks @Frederic@beehaw.org
Yes, Nice distro, but unfortunately their RPI respin use systemD 👎
 
https://forum.mxlinux.org/viewtopic.php?t=85188