Add debug message, reduce ram usage to avoid comm corruption from stack

Marlin/Configuration.h

@@ -2084,7 +2084,7 @@
   // Gradually reduce leveling correction until a set height is reached,
   // at which point movement will be level to the machine's XY plane.
   // The height can be set with M420 Z<height>
-  #define ENABLE_LEVELING_FADE_HEIGHT
+  //#define ENABLE_LEVELING_FADE_HEIGHT
   #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
     #define DEFAULT_LEVELING_FADE_HEIGHT 00.0 // (mm) Default fade height.
   #endif
@@ -2529,7 +2529,7 @@
  *
  * View the current statistics with M78.
  */
-#define PRINTCOUNTER
+//#define PRINTCOUNTER
 #if ENABLED(PRINTCOUNTER)
   #define PRINTCOUNTER_SAVE_INTERVAL 60 // (minutes) EEPROM save interval during print
 #endif

Marlin/Configuration_adv.h

@@ -1214,7 +1214,7 @@
 // Backlash Compensation
 // Adds extra movement to axes on direction-changes to account for backlash.
 //
-#define BACKLASH_COMPENSATION
+//#define BACKLASH_COMPENSATION
 #if ENABLED(BACKLASH_COMPENSATION)
   // Define values for backlash distance and correction.
   // If BACKLASH_GCODE is enabled these values are the defaults.
@@ -2459,7 +2459,7 @@
 // For debug-echo: 128 bytes for the optimal speed.
 // Other output doesn't need to be that speedy.
 // :[0, 2, 4, 8, 16, 32, 64, 128, 256]
-#define TX_BUFFER_SIZE 128
+#define TX_BUFFER_SIZE 64
 
 // Host Receive Buffer Size
 // Without XON/XOFF flow control (see SERIAL_XON_XOFF below) 32 bytes should be enough.

Marlin/src/lcd/extui/ia_dwin/Creality_DWIN.cpp

@@ -580,10 +580,10 @@ int RTSSHOW::RTS_RecData()
           recdat.addr = vp;
           recdat.len = tmp[2];
           for(unsigned int i = 0;i < dlen; i+=2)
-        {
-          recdat.data[i/2]= tmp[3+i];
-          recdat.data[i/2]= (recdat.data[i/2] << 8 )| tmp[4+i];
-        }
+          {
+            recdat.data[i/2]= tmp[3+i];
+            recdat.data[i/2]= (recdat.data[i/2] << 8 )| tmp[4+i];
+          }
 
           SERIAL_ECHOLNPGM("VP received: ", vp , " - len ", tmp[2]);
 
@@ -598,6 +598,7 @@ int RTSSHOW::RTS_RecData()
 
       // discard anything else
       rx_datagram_state = DGUS_IDLE;
+      return -1;
     }
   }
   return -1;
@@ -801,7 +802,7 @@ void RTSSHOW::RTS_HandleData()
 	SERIAL_ECHOLNPGM_P(PSTR("  *******RTS_HandleData******** "));
 	if (waitway > 0) //for waiting
 	{
-		SERIAL_ECHOLNPGM("waitway ==", (int)waitway);
+		SERIAL_ECHOLNPGM("handle waitway ==", (int)waitway);
 		memset(&recdat, 0, sizeof(recdat));
 		recdat.head[0] = FHONE;
 		recdat.head[1] = FHTWO;