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in that case this may be of interest, I hooked the ESP up to the paneldue port instead of telnet, it has 5v power and 3.3v serial and listened for the beep messages. https://forum.duet3d.com/post/93891
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I'll change "Firmware electronics" to just "Electronics" in the next release.
EDIT: looks like that needs to be changed in DWC, not RRF.