Sorry about that bug!
Yes, I missed keeping char within the closure. I’ve edited the example code.
But, now I have a first version of the “official” bot code 
Unlike my simple example above, this code can be used for all types of bot making.
My initial use is load testing, but it would be easy adapt it to make a bot that can listen for commands and act upon them:
Accipiter says to the receptionist ,"I need an apartment."
(Okay, that was not the best example. But you get the idea.)
If you need help in making a command-taking module, or to know which API calls you can use to list possible (vacant) rooms, or to transfer ownership, just ask!