Support for M80/M81 for Balco 3D Printer (Mainboard 5.2C) / MKII

[BogdanTheGeek]

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Feature Request

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Detailed description of the feature request:

Marlin has support for Power on and off with M80/M81 and if the printer is always connected to OctoPrint then the mainboard remains powered up even if the main PSU is disconnected. This is useful as it makes the printer silent. I see most of the code is there to enable this to work and M81 returns ok but it doesn't do anything.
What is left to do in order to implement this feature? I can do it myself, I just need a bit of guidance from someone who knows the code better.

[andrivet]

Information posted on ADVi3++ Community:
https://community.advi3pp.com/t/printer-auto-shutdown/233/28

Relay board goes to pin 17 (PH5)

[andrivet]

Information posted on ADVi3++ Community:
https://community.advi3pp.com/t/aldi-balco-he180021-5-2c-pcb/

I checked the printer internals and came to the conclusion that the additional power switch pcb had developed a fault (rather coincidentally at the same time as updating the firmware) so I have simply bypassed it.

This board (photo attached with modified bypass wiring) appears to produce an initial power on activation and relay energisation for the power supply activation, but then seems to require a signal, either continuous or pulsed in the form of a watchdog from the mainboard (2560 pin 17 PH5/OC4C) via a 2pin cable and into an opto isolator to maintain the power supply on.

Printer now powers up ok.