Meshtastic
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Meshtastic is an open-source off-grid decentralized network based on Lora technology.
Once you purchased a node and flash it using the meshtastic web flasher you can connect to your node from your pmos phone using a serial, bluetooth or wifi link.
meshtastic python script let you communicate with your node from command line.
Gtk-meshtastic-client is an adaptive graphical client for linux from Chris Talbot.