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The firmware has a 'default' channel where the psk is well-known: https://meshtastic.org/docs/settings/channel

> Selecting a default or any of the simple values from the following table will use publicly known encryption keys. They're shipped with Meshtastic source code and thus, anyone can listen to messages encrypted by them. They're great for testing and public channels.

In $west_coast_city I've gotten a fair amount of random pings on default settings.

Other projects (using other base technologies) like https://www.arednmesh.org/ are more focused on joining an already-existing network than making your own.



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