The blue LED indicates a connection to a central device.
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Real Web-Terminal with ANSI Escape Sequences
My CRS-Terminal and the Serial Bluetooth Terminal have only a command line and no real terminal emulation e.g. ANSI escape sequences and therefore can't be used for the vi.
The JavaScript library "termlib.js" provides a `Terminal' object, which facillitates a simple and object oriented approach to generate and control a terminal-like interface for web services.
"termlib.js" features direct keyboard input and powerful output methods for multiple and simultanious instances of the `Terminal' object.
https://www.masswerk.at/termlib/index.html