Proof of concept telnet client for Altair-Duino

[Matthew Brugman]

(Note, this is presenting a telnet CLIENT to the Altair; not a telnet server serial port connector like the ESP-01s)

One of the reasons I wanted to be sure to add the TX/RX LED serial port right away was so I could do crazy things with it configured as the second port on the 88-2SIO.

I grabbed an ESP32 from my drawer-o-junk and wrote some quick code using software serial to talk to the Altair.  It presents a pretty simple menu-driven application to configure WiFi, configure Telnet (user/pass if required, server address), and a couple of other things.

On the Altair side, there's a short MBASIC program to read/write the second 2SIO serial port; basically a dumb serial terminal. 

Here's a quick video showing it connecting to an internet telnet server: https://youtu.be/PWq2H8R5fGM?si=pJBFxT4nhHkTWbHd

It's a little messy, there's a big with extra returns popping in randomly, but it works :)

In a couple of days I'll share all the source code on Github, but the next few days are busy.  I'm just stoked that it worked and wanted to share.  My eventual plan to make this an expansion card with proper config/status and data registers.  Also plan on adding a simple ftp client to make file transfers easier (for those used to ftp).