FYI I'm going to be using the 3rd-party prompt-toolkit for the chat client. (The server depends only on asyncio only).  I put several hours research into finding a way for the CLI chat client to be not terrible, but it gets very complicated trying to manage stdin and stdout with asyncio.  OTOH prompt-toolkit just gives us exactly what we need, and the code looks short, neat and easy to understand. I hope that's ok (that I'll be mentioning a 3rd party lib in the tutorial).