gcode: Add Marlin / Octoprint SD card compatible behavior #3976
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This PR adds enough SD card gcode compatibility to list USB contents, including sub-directories, and start/stop/pause/resume printing from Octoprint or any other gcode serial interface application.
Addresses issue #3054
Alternative solution to #3765 (includes sub-directories and M23/M24 actually work)
Note: Installing the
BGCode
Octoprint plugin makes.bgcode
files visible in the file listings. The entries can then be selected and printing started, etc. thus increasing the usability of Octoprint with the Buddy.