MeshCore is a lightweight alternative to Meshtastic LoRa-based off-grid messaging - CNX Software
「 While Meshtastic is by far the most popular off-grid messaging solution relying on LoRa radios, MeshCore offers an alternative as a lightweight C++ library and firmware designed for multi-hop packet routing and made for developers who want to create resilient, decentralized communication networks that work without the internet 」