[SSD1306] Fix reboot loop with latest ESP32 platform (#1551)

main/config_SSD1306.h

@@ -107,6 +107,7 @@
 extern void setupSSD1306();
 extern void loopSSD1306();
 extern void MQTTtoSSD1306(char*, JsonObject&);
+extern String stateSSD1306Display();
 
 // Simple construct for displaying message in lcd and oled displays
 
@@ -140,6 +141,10 @@ struct displayQueueMessage {
   char line4[OLED_TEXT_WIDTH];
 };
 
+displayQueueMessage* currentOledMessage;
+
+/*-------------------End of Global Variables----------------------*/
+
 // This pattern was borrowed from HardwareSerial and modified to support the ssd1306 display
 
 class OledSerial : public Stream {