flexi-bot/docs/marlin/_gcode/M117.md

tag	title	brief	author	requires	group	codes	notes	parameters	examples
m0117	Set LCD Message	Set the message line on the LCD.	thinkyhead	ULTRA_LCD	lcd	M117	Requires an LCD controller. The message should appear immediately, but it will depend on LCD settings.	tag optional description string true LCD status message	pre code Set the message to "Hello World!" M117 Hello World!

Set the status line message on the LCD.