Meshtastic

Figure 1: A selection of Meshtastic devices. From back, left to right: T-Deck, Heltec V3 in Slim Pro case, T-Echo in Expedition case, and a T-BEAM. In front tis the T114.

Meshtastic enables you to use inexpensive LoRa radios as a long range off-grid communication platform in areas without existing or reliable communications infrastructure.

Links

Documentation
Device flasher used to update and install the Meshtastic firmware onto a device.
Meshtastic CONOP for local contingency comms, and some Baseline Meshtastic Hardware.
Getting started with Meshtastic.