Meshtastic is based around text messages but you can tie in servers and sensors as well. We have BBS (bulletin boards) and AI prompts on our network. There are some other systems built on LoRa that can send data like internet, but it's meant to be low power and low bandwidth.
It's an alternative to cellular networks and great where no comms exist (hiking, hunting, backcountry skiing etc).
meshtastic.org is the place to start. I would suggest some videos from The Comms Channel on YouTube.