extended protocol ?

Author: thinkyhead

Marlin/src/core/language.h

@@ -135,6 +135,7 @@
 #define STR_BUSY_PAUSED_FOR_USER            "busy: paused for user"
 #define STR_BUSY_PAUSED_FOR_INPUT           "busy: paused for input"
 #define STR_Z_MOVE_COMP                     "Z_move_comp"
+#define STR_LINE_NO                         "Line #: "
 #define STR_RESEND                          "Resend: "
 #define STR_UNKNOWN_COMMAND                 "Unknown command: \""
 #define STR_ACTIVE_EXTRUDER                 "Active Extruder: "

Marlin/src/gcode/host/M110.cpp

@@ -31,5 +31,5 @@ void GcodeSuite::M110() {
   if (parser.seenval('N'))
     queue.set_current_line_number(parser.value_long());
   else
-    SERIAL_ECHO_MSG("M110 N", queue.get_current_line_number());
+    SERIAL_ECHOLNPGM(STR_LINE_NO, queue.get_current_line_number());
 }