@klaatu I haven't used
#picocom, but when you say
#minicom is the easiest way to talk to a serial port, I have a discovery to share.
Minicom is a full-featured way, you have full control over your DTR pins and whatnot, and I used it a lot back in the days of BBSes and nullmodems between computers, but it also can become a bit bewildering and require some configuration. Actually the simplest way is to use
#screen!
Yes! Screen is actually not just a console multiplexer, they also figured "well we have all this terminal emulation stuff in here anyway, might as well throw in serial line support.".
I've been using screen until just five years ago and before that ever since, well, since those minicom days, and I never realized there was an overlap. I only learned about it like last year when reading a tmux vs screen comparison (tmux doesn't do serial).