ESP32 + LoRa: Meshtastic, the off-grid mesh firmware
Flash Meshtastic on an ESP32 + LoRa board and you have an off-grid text messaging device with mesh routing, encryption, and battery-friendly operation. No SIM card, no monthly bill, no account.
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Flash Meshtastic on an ESP32 + LoRa board and you have an off-grid text messaging device with mesh routing, encryption, and battery-friendly operation. No SIM card, no monthly bill, no account.