This is totally off topic -- so delete as required!!
I'm investigating a project, and have no clue as to where to start, other than Google/reseach/etc..
Curious as to how to setup a test system to have test users send/receive sms/test messages.
If a user has a mobile/app that connects back to the "server" for the
msg handling "stuff" does the process need to involve a twillo/telcom?
I've seen open source projects (zulip) that have the server/client/mobile parts, but have no clue as to what's involved with architecting or building out a complete/working solution.
So, I figured I'd ask here if anyone has any insight into this kind of system, or has pointers to any company/resource that I could talk to.