Wi-Fi: prevent saving settings into flash; save power during startup

Author: 0xCAFEDECAF

VanLiveConnect/Sleep.ino

@@ -64,6 +64,9 @@ void GoToSleep()
     );
     Serial.flush();
 
+    WiFi.disconnect(true);
+    delay(1);
+
     IrDisable();
     VanBusRx.Disable();
 

VanLiveConnect/VanLiveConnect.ino

@@ -331,6 +331,10 @@ void setup()
     digitalWrite(LED_BUILTIN, LED_OFF);
   #endif
 
+    WiFi.mode(WIFI_OFF);
+    WiFi.forceSleepBegin();
+    delay(1);
+
     md5Checksum = ESP.getSketchMD5();
 
     SetupSleep();
@@ -537,4 +541,6 @@ void loop()
         VanBusRx.DumpStats(Serial);
     } // if
   #endif // SHOW_VAN_RX_STATS
+
+    delay(9);
 } // loop

VanLiveConnect/Wifi.ino

@@ -168,6 +168,12 @@ const char* SetupWifi()
 
     static const char* wifiSsid = WIFI_SSID;
 
+    WiFi.forceSleepWake();
+    delay(1);
+
+    // Disable the WiFi persistence. The ESP8266 will not load and save WiFi settings in the flash memory.
+    WiFi.persistent(false);
+
   #ifdef WIFI_AP_MODE
 
   #ifdef ON_DESK_MFD_ESP_MAC
@@ -224,7 +230,6 @@ const char* SetupWifi()
 
     WiFi.mode(WIFI_STA);  // Otherwise it may be in WIFI_AP_STA mode, broadcasting an SSID like AI_THINKER_XXXXXX
     WiFi.disconnect();  // After reset via HW button sometimes cannot seem to reconnect without this
-    WiFi.persistent(false);
   #ifdef ARDUINO_ARCH_ESP32
    #if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 0)
     WiFi.setAutoReconnect(true);