Meshtastic is fun but limited—more of a radio chat app than real mesh infrastructure. If you're serious about decentralized comms, check out Reticulum: https://reticulum.network

It’s not limited to LoRa—Reticulum works over IP, serial, packet radio, or whatever you have. Delay-tolerant, multi-hop, encrypted, no servers needed. Still lots of work to do and apps to build, but the foundation is solid.

Great talk from EH22: https://media.ccc.de/v/eh22-97-eggceptional-meshnetworking