After trying many self-hosted chat server solutions(e.g. Matrix,Rocket chat, mattermost) and some p2p chat apps,, I choose Mattermost, it's the only solution that worked at a local network, though it's not friendly to encrypted messages, my need is for LAN chat, so it's not bad.

After trying many self-hosted chat server solutions(e.g. Matrix,Rocket chat, mattermost) and some p2p chat apps,, I choose Mattermost, it's the only solution that worked at a local network, though it's not friendly to encrypted messages, my need is for LAN chat, so it's not bad.
— Owen Young (@TheOwenYoung) 2021-02-16 08:16