Is there a chat program that works offline and online and has mobile apps.

LiiTheBaddie@lemmy.ml to Asklemmy@lemmy.ml – 43 points –

I am wondering if there is a chat program that works locally when the internet is out but still be connected to from the internet. I know this will be something that is self hosted.

Bonus points if I can set it up on the raspberry pi that is running Home Assistant.

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I did some looking into matrix but couldn't find if it would still work when the internet is out.

Not really. You need to use a domain (correct me, if I'm wrong, but I think IP adresses don't work) to connect to the homeserver.

In theory you could setup a DNS server in your nezwork, which resolves this domain with the local adress and then it might work, but I'm not sure if the homeserver would like that.

Also I want to add, that I use TeamSpeak, which works perfectly globally and locally, but it's for voice chat.

Aah, yes. You're right there. You will require a domain for it to work. Although, you could still have it work with a local DNS server for internet outages. You would still be able to chat locally in that case. But yeah, this does not seem like what OP is looking for.