On 12 Mar 2019, Matthew no said the following...
 
 Mn> I stumbled across your how-to during my searching. Unfortunately,
 Mn> DoorParty won't work for me in this situation as this server needs to
 Mn> remain isolated from the rest of the world. (LAN only for me and the
 Mn> other old nerds in my office..hehe)  I may spin 
 Mn> up a publicly available BBS in the near future, and when I do, DoorParty
 Mn> all the way!!

Oh, yeah, it'll work for your local BBS as well. Like I said, I had it
working on my local BBS, and I just ported it to DoorParty afterwards. So
it'll work on just a local setup as well.

--- Mystic BBS v1.12 A43 2019/02/23 (Raspberry Pi/32)