Looking in the source code file remote.c, I see that sBitx supports a telnet server on port 8081. Using the telnet client built into Windows 10, I can connect to the server about 1 time in 3. When it doesn't connect I get a message 'unable to connect'. When I do connect, the screen clears and prints "sbitx v2.0" at the top. But what can I do at that point. If I type an 'f' I get the response shown in the screen shot.
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73,
Mark, N8ME
Mark Erbaugh