v1.2.0 to add ESP32 + LwIP Ethernet

#### Releases v1.2.0

1. Initial coding to port [esp32_https_server](https://github.com/fhessel/esp32_https_server) and [ESP32_HTTPS_Server](https://github.com/khoih-prog/ESP32_HTTPS_Server) to ESP32 boards, WT32_ETH01, (ESP32 + LwIP W5500) and (ESP32 + LwIP ENC28J60) Ethernet
2. Use `allman astyle` and restyle library.

Author: khoih-prog

examples/ESP32_WiFi/Async-Server/Async-Server.ino

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+/**
+   Example for the ESP32 HTTP(S) Webserver
+
+   IMPORTANT NOTE:
+   To run this script, your need to
+    1) Enter your WiFi SSID and PSK below this comment
+    2) Make sure to have certificate data available. You will find a
+       shell script and instructions to do so in the library folder
+       under extras/
+
+   This script will install an HTTPS Server on your ESP32 with the following
+   functionalities:
+    - Show simple page on web server root
+    - 404 for everything else
+   The server will be run in a separate task, so that you can do your own stuff
+   in the loop() function.
+   Everything else is just like the Static-Page example
+*/
+
+// TODO: Configure your WiFi here
+#define WIFI_SSID "<your ssid goes here>"
+#define WIFI_PSK  "<your pre-shared key goes here>"
+
+/** Check if we have multiple cores */
+#if CONFIG_FREERTOS_UNICORE
+  #define ARDUINO_RUNNING_CORE 0
+#else
+  #define ARDUINO_RUNNING_CORE 1
+#endif
+
+// Include certificate data (see note above)
+#include "cert.h"
+#include "private_key.h"
+
+// We will use wifi
+#include <WiFi.h>
+
+#include <HTTPS_Server_Generic.h>
+
+// The HTTPS Server comes in a separate namespace. For easier use, include it here.
+using namespace httpsserver;
+
+// Create an SSL certificate object from the files included above
+SSLCert cert = SSLCert(example_crt_DER, example_crt_DER_len,
+                       example_key_DER, example_key_DER_len);
+
+// Create an SSL-enabled server that uses the certificate
+HTTPSServer secureServer = HTTPSServer(&cert);
+
+// Declare some handler functions for the various URLs on the server
+void handleRoot(HTTPRequest * req, HTTPResponse * res);
+void handle404(HTTPRequest * req, HTTPResponse * res);
+
+// We declare a function that will be the entry-point for the task that is going to be
+// created.
+void serverTask(void *params);
+
+void setup()
+{
+  // For logging
+  Serial.begin(115200);
+
+  while (!Serial && millis() < 5000);
+
+  ///////////////////////////////////////////////
+
+  Serial.print("\nStarting Async_Server on ");
+  Serial.println(ARDUINO_BOARD);
+  Serial.println(HTTPS_SERVER_GENERIC_VERSION);
+
+  ///////////////////////////////////
+
+  // Connect to WiFi
+  Serial.println("Setting up WiFi");
+  WiFi.begin(WIFI_SSID, WIFI_PSK);
+
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    Serial.print(".");
+    delay(500);
+  }
+
+  ///////////////////////////////////
+
+  Serial.print(F("HTTPS WiFiWebServer is @ IP : "));
+  Serial.println(WiFi.localIP());
+
+  Serial.print(F("To access, use https://"));
+  Serial.println(WiFi.localIP());
+
+  ///////////////////////////////////////////////
+
+  // Setup the server as a separate task.
+  Serial.println("Creating server task... ");
+  // We pass:
+  // serverTask - the function that should be run as separate task
+  // "https443" - a name for the task (mainly used for logging)
+  // 6144       - stack size in byte. If you want up to four clients, you should
+  //              not go below 6kB. If your stack is too small, you will encounter
+  //              Panic and stack canary exceptions, usually during the call to
+  //              SSL_accept.
+  xTaskCreatePinnedToCore(serverTask, "https443", 6144, NULL, 1, NULL, ARDUINO_RUNNING_CORE);
+}
+
+void loop()
+{
+  Serial.println("loop()");
+  delay(5000);
+}
+
+void serverTask(void *params)
+{
+  // In the separate task we first do everything that we would have done in the
+  // setup() function, if we would run the server synchronously.
+
+  // Note: The second task has its own stack, so you need to think about where
+  // you create the server's resources and how to make sure that the server
+  // can access everything it needs to access. Also make sure that concurrent
+  // access is no problem in your sketch or implement countermeasures like locks
+  // or mutexes.
+
+  // Create nodes
+  ResourceNode * nodeRoot    = new ResourceNode("/", "GET", &handleRoot);
+  ResourceNode * node404     = new ResourceNode("", "GET", &handle404);
+
+  // Add nodes to the server
+  secureServer.registerNode(nodeRoot);
+  secureServer.setDefaultNode(node404);
+
+  Serial.println("Starting server...");
+  secureServer.start();
+
+  if (secureServer.isRunning())
+  {
+    Serial.println("Server ready.");
+
+    // "loop()" function of the separate task
+    while (true)
+    {
+      // This call will let the server do its work
+      secureServer.loop();
+
+      // Other code would go here...
+      delay(1);
+    }
+  }
+}
+
+void handleRoot(HTTPRequest * req, HTTPResponse * res)
+{
+  // Status code is 200 OK by default.
+  // We want to deliver a simple HTML page, so we send a corresponding content type:
+  res->setHeader("Content-Type", "text/html");
+
+  // The response implements the Print interface, so you can use it just like
+  // you would write to Serial etc.
+  res->println("<!DOCTYPE html>");
+  res->println("<html>");
+  res->println("<head><title>Hello World!</title></head>");
+  res->println("<body>");
+  res->println("<h1>Hello World!</h1>");
+  res->print("<p>Your server is running for ");
+  // A bit of dynamic data: Show the uptime
+  res->print((int)(millis() / 1000), DEC);
+  res->println(" seconds.</p>");
+  res->println("</body>");
+  res->println("</html>");
+}
+
+void handle404(HTTPRequest * req, HTTPResponse * res)
+{
+  // Discard request body, if we received any
+  // We do this, as this is the default node and may also server POST/PUT requests
+  req->discardRequestBody();
+
+  // Set the response status
+  res->setStatusCode(404);
+  res->setStatusText("Not Found");
+
+  // Set content type of the response
+  res->setHeader("Content-Type", "text/html");
+
+  // Write a tiny HTTP page
+  res->println("<!DOCTYPE html>");
+  res->println("<html>");
+  res->println("<head><title>Not Found</title></head>");
+  res->println("<body><h1>404 Not Found</h1><p>The requested resource was not found on this server.</p></body>");
+  res->println("</html>");
+}

examples/ESP32_WiFi/Async-Server/cert.h

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+#ifndef CERT_H_
+#define CERT_H_
+#error You have to run the srcipt extras/create_cert.sh to recreate these files
+#endif

examples/ESP32_WiFi/Async-Server/private_key.h

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+#ifndef PRIVATE_KEY_H_
+#define PRIVATE_KEY_H_
+#error You have to run the srcipt extras/create_cert.sh to recreate these files
+#endif