Some ESP32 patches (#16297)

Marlin/src/HAL/HAL_ESP32/WebSocketSerial.h

@@ -25,14 +25,16 @@
 
 #include <Stream.h>
 
-#ifndef RX_BUFFER_SIZE
-  #define RX_BUFFER_SIZE 128
-#endif
 #ifndef TX_BUFFER_SIZE
   #define TX_BUFFER_SIZE 32
 #endif
-#if TX_BUFFER_SIZE <= 0
-  #error "TX_BUFFER_SIZE is required for the WebSocket."
+#if ENABLED(WIFISUPPORT)
+  #ifndef RX_BUFFER_SIZE
+    #define RX_BUFFER_SIZE 128
+  #endif
+  #if TX_BUFFER_SIZE <= 0
+    #error "TX_BUFFER_SIZE is required for the WebSocket."
+  #endif
 #endif
 
 typedef uint16_t ring_buffer_pos_t;