Any VT100 and/or NSH Console experts?

[Gregory Nutt]

Sounds like you need an nxterm.  An nxterm is the logical counterpart to 
an xterm.  You can find it at nutts/grapphics/nxterm.

It supports echoing text in a framebuffer and quite a few VT100 keyboard 
inputs.  There are all also lots of example to illustrate building and 
using it.  It hasn't been used in a long time so I can't guarantee its 
current state.

There is a lot of discussion in Confluence as well.  This is probably to 
the point: https://cwiki.apache.org/confluence/display/NUTTX/NxTerm+Example