v1.2.0 to add common code to library

#### Releases v1.2.0

1. Add common code to library
2. Renew examples

Author: khoih-prog

examples/ESP32_FS_EthernetWebServer/ESP32_FS_EthernetWebServer.ino

@@ -69,8 +69,6 @@ IPAddress mySN(255, 255, 255, 0);
 // Google DNS Server IP
 IPAddress myDNS(8, 8, 8, 8);
 
-bool eth_connected = false;
-
 //holds the current upload
 File fsUploadFile;
 
@@ -464,55 +462,6 @@ void initWebserver(void)
   server.begin();
 }
 
-void WiFiEvent(WiFiEvent_t event)
-{
-  switch (event)
-  {
-    case SYSTEM_EVENT_ETH_START:
-      Serial.println("\nETH Started");
-      //set eth hostname here
-      ETH.setHostname("WT32-ETH01");
-      break;
-    case SYSTEM_EVENT_ETH_CONNECTED:
-      Serial.println("ETH Connected");
-      break;
-
-    case SYSTEM_EVENT_ETH_GOT_IP:
-      if (!eth_connected)
-      {
-        Serial.print("ETH MAC: ");
-        Serial.print(ETH.macAddress());
-        Serial.print(", IPv4: ");
-        Serial.print(ETH.localIP());
-
-        if (ETH.fullDuplex())
-        {
-          Serial.print(", FULL_DUPLEX");
-        }
-
-        Serial.print(", ");
-        Serial.print(ETH.linkSpeed());
-        Serial.println("Mbps");
-        eth_connected = true;
-      }
-
-      break;
-
-    case SYSTEM_EVENT_ETH_DISCONNECTED:
-      Serial.println("ETH Disconnected");
-      eth_connected = false;
-      break;
-
-    case SYSTEM_EVENT_ETH_STOP:
-      Serial.println("\nETH Stopped");
-      eth_connected = false;
-      break;
-
-    default:
-      break;
-  }
-}
-
 void setup(void)
 {
   Serial.begin(115200);
@@ -534,10 +483,9 @@ void setup(void)
   //bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = 0, IPAddress dns2 = 0);
   ETH.config(myIP, myGW, mySN, myDNS);
 
-  WiFi.onEvent(WiFiEvent);
+  WT32_ETH01_onEvent();
 
-  while (!eth_connected)
-    delay(100);
+  WT32_ETH01_waitForConnect();
 
   initFS();
   listDir();