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

main/ZdisplaySSD1306.ino

@@ -102,7 +102,10 @@ void loopSSD1306() {
       if (!Oled.displayPage(message)) {
         Log.warning(F("[ssd1306] displayPage failed: %s" CR), message->title);
       }
-      free(message);
+      if (currentOledMessage) {
+        free(currentOledMessage);
+      }
+      currentOledMessage = message;
       nextDisplayPage = uptime() + DISPLAY_PAGE_INTERVAL;
       logoDisplayed = false;
     }
@@ -824,22 +827,22 @@ OledSerial Oled(0); // Not sure about this, came from Hardwareserial
 OledSerial::OledSerial(int x) {
   displayQueue = xQueueCreate(5, sizeof(displayQueueMessage*));
 #  if defined(WIFI_Kit_32) || defined(WIFI_LoRa_32) || defined(WIFI_LoRa_32_V2)
-  pinMode(RST_OLED, OUTPUT);
-  digitalWrite(RST_OLED, LOW);
-  delay(50);
-  digitalWrite(RST_OLED, HIGH);
+  // pinMode(RST_OLED, OUTPUT); // https://github.com/espressif/arduino-esp32/issues/4278
+  // digitalWrite(RST_OLED, LOW);
+  // delay(50);
+  // digitalWrite(RST_OLED, HIGH);
   display = new SSD1306Wire(0x3c, SDA_OLED, SCL_OLED, GEOMETRY_128_64);
 #  elif defined(Wireless_Stick)
-  pinMode(RST_OLED, OUTPUT);
-  digitalWrite(RST_OLED, LOW);
-  delay(50);
-  digitalWrite(RST_OLED, HIGH);
+  // pinMode(RST_OLED, OUTPUT); // https://github.com/espressif/arduino-esp32/issues/4278
+  // digitalWrite(RST_OLED, LOW);
+  // delay(50);
+  // digitalWrite(RST_OLED, HIGH);
   display = new SSD1306Wire(0x3c, SDA_OLED, SCL_OLED, GEOMETRY_64_32);
 #  elif defined(ARDUINO_TTGO_LoRa32_v21new) // LILYGO® Disaster-Radio LoRa V2.1_1.6.1
-  pinMode(OLED_RST, OUTPUT);
-  digitalWrite(OLED_RST, LOW);
-  delay(50);
-  digitalWrite(OLED_RST, HIGH);
+  // pinMode(OLED_RST, OUTPUT);   // https://github.com/espressif/arduino-esp32/issues/4278
+  // digitalWrite(OLED_RST, LOW);
+  // delay(50);
+  // digitalWrite(OLED_RST, HIGH);
   display = new SSD1306Wire(0x3c, OLED_SDA, OLED_SCL, GEOMETRY_128_64);
 #  endif
 }
@@ -995,7 +998,7 @@ void OledSerial::drawLogo(int xshift, int yshift) {
   }
 }
 
-void stateSSD1306Display() {
+String stateSSD1306Display() {
   //Publish display state
   StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
   JsonObject DISPLAYdata = jsonBuffer.to<JsonObject>();
@@ -1021,6 +1024,9 @@ void stateSSD1306Display() {
   } else {
     Oled.display->resetOrientation();
   }
+  String output;
+  serializeJson(DISPLAYdata, output);
+  return output;
 }
 
 #endif

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 {