[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.