From 068d4a1eb28183e1485f28d7f137dd23b5fdf817 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Thu, 28 May 2015 17:44:09 -0700
Subject: [PATCH 1/2] Ignore unknown commands if they start with G, M, or T

---
 Marlin/Marlin_main.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 4fa3e65841..a4d88e0710 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -5301,7 +5301,7 @@ void process_next_command() {
         gcode_G92();
         break;
 
-      default: code_is_good = false;
+      // default: code_is_good = false;
     }
     break;
 
@@ -5392,8 +5392,6 @@ void process_next_command() {
         gcode_M109();
         break;
 
-      case 110: break; // M110: Set line number - don't show "unknown command"
-
       #if HAS_TEMP_BED
         case 190: // M190: Wait for bed heater to reach target
           gcode_M190();
@@ -5735,13 +5733,15 @@ void process_next_command() {
         gcode_M999();
         break;
 
-      default: code_is_good = false;
+      // default: code_is_good = false;
     }
     break;
 
     case 'T':
       gcode_T(codenum);
     break;
+
+    default: code_is_good = false;
   }
 
 ExitUnknownCommand:

From 9beed830eb7c99fbe5b901462a9ce098f7d39978 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Thu, 28 May 2015 17:53:47 -0700
Subject: [PATCH 2/2] Drop commented code_is_good lines

---
 Marlin/Marlin_main.cpp | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index a4d88e0710..6cf61fa948 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -5300,8 +5300,6 @@ void process_next_command() {
       case 92: // G92
         gcode_G92();
         break;
-
-      // default: code_is_good = false;
     }
     break;
 
@@ -5732,8 +5730,6 @@ void process_next_command() {
       case 999: // M999: Restart after being Stopped
         gcode_M999();
         break;
-
-      // default: code_is_good = false;
     }
     break;