Off-Grid Rf-based Communication Through Lo-Ra

Authors: Amiras Patel, Vraj Bhingradiya, Harsh Upadhyay, Shashank Patel

Abstract: In environments where conventional communication infrastructure is unavailable or has failed, a critical need arises for independent and resilient connectivity solutions. This project details the design, implementation, and performance of a proof- of-concept off-grid communication system that facilitates peer- to-peer (P2P) text messaging using LoRa (Long Range) tech- nology.1 The system is architected to be entirely infrastructure- independent, requiring no cellular networks, gateways, or cen- tralized servers.1 The hardware implementation consists of portable, low-power nodes built with an ESP32 microcontroller, an SX1278 LoRa transceiver, and an OLED display.1 Real- world testing in a semi-urban environment validated the system’s effectiveness, achieving reliable message delivery with a Packet Delivery Ratio (PDR) exceeding 90.