[urza]

https://disaster.radio/

disaster.radio is an off-grid, solar-powered, long-range mesh network built on free, open source software and affordable, open hardware.

Designed to be open, distributed, and decentralized, disaster.radio is currently in the prototype/development phase.

[zoobab]

this is only for short messages via Lora, 40 chars at a time last time I tried.

[rch]

Still good for shorthand, locations, coordinating communication by other means, and the like.

[hackerman123469]

What counts as a character? 1 ASCII or 1 Unicode? If Unicode then just use Chinese and you can express a lot in the span of 40 characters.