@miladj I haven't tried it yet, but it sounds like you probably want to look into something called "snac" - it's a Fediverse server written in C, which can talk to other servers when it's connected to the internet, but is still totally usable on a small disconnected network. There are lots of server options, but snac is small and - from what I've heard - easy to manage. I've been planning to run my own instance for months, I just had other priorities!