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@JulianOliver
In a disaster situation when there are no phones or internet, we might be able to set up a wireless access point, even with just a RaspberryPi. But then, without the disservices of Big Tech, how do we communicate?

You need to know who is who on your makeshift network, a pattern called "discovery." Then when you know who to connect with, how do people set up a minimal (group) chat session, even in a terminal, without installing anything.

That's what we're trying to figure out.