I would absolutely encourage everyone reading this to check out Reticulum [1] if you haven't already. I believe the base project might be in need of new maintainers(?) at the moment and the main dev has some very strong takes, but it is a very well-thought out approach to distributed networking at the protocol layer. The existing implementations out there include a desktop app which can function over the internet (IP) or a USB connection to some existing LoRA boards. I recently purchased a LilyGo T-Echo [2] and have had a great experience flashing the open-source firmware and using it connected to a desktop over USB or connected over Bluetooth to the fantastic new companion app Columba [3]. This app seriously makes Reticulum feel like a first class citizen when it comes to parity support for messaging. You can even send files/images (with limitations of course)! And since it works at the network level, you can make your own apps to run over Reticulum as well.
[1] https://reticulum.network/ [2] https://lilygo.cc/products/t-echo-lilygo [3] https://github.com/torlando-tech/columba