Meshtastic is an open-source, long-range, low-power communication system that uses LoRa radios to form a wireless mesh network. It allows users to send text messages, GPS locations, and sensor data without relying on cell service or the internet. Each node acts as a repeater, passing messages through the network to extend coverage. Meshtastic devices can be small handheld radios, ESP32-based boards, or even modified trackers. They connect via Bluetooth or USB to a phone or computer running the Meshtastic app, making it easy to send and receive messages.