You are right there isn’t much Kelly community on that. But there is some materialized movement. You should have a look at https://subvertisers-international.net/zap-games/ (I don’t know subvertisers-international, but I participate multiple time to the ZAP games)

Not sure what you mean with « mesh network » (I’m not native English) but Telegram is quite cool. It use a small internet debit, as a good native app for phone or pc, file transfer of multiple gb is possible (even more with the paid version), groups and subgroups, …