Create WiFiClientEnterprise.ino (#1640)

Sketch for ESP32 boards that allow them to connect to WPA/WPA2 Enterprise Networks.

libraries/WiFi/examples/WiFiClientEnterprise/WiFiClientEnterprise.ino

+//Sketch edited by: Martin Chlebovec
+//Personal website: https://arduino.php5.sk
+#include "esp_wpa2.h"
+#include <WiFi.h>
+#define EAP_IDENTITY "login@university.domain" //eduroam login --> identity@youruniversity.domain
+#define EAP_PASSWORD "password" //your Eduroam password
+String line; //variable for response
+const char* ssid = "eduroam"; // Eduroam SSID
+const char* host = "arduino.php5.sk"; //external server domain for HTTP connection after authentification
+void setup() {
+  Serial.begin(115200);
+  delay(10);
+  Serial.println();
+  Serial.print("Connecting to network: ");
+  Serial.println(ssid);
+  WiFi.disconnect(true);  //disconnect form wifi to set new wifi connection
+  esp_wifi_sta_wpa2_ent_set_identity((uint8_t *)EAP_IDENTITY, strlen(EAP_IDENTITY)); //provide identity
+  esp_wifi_sta_wpa2_ent_set_username((uint8_t *)EAP_IDENTITY, strlen(EAP_IDENTITY)); //provide username
+  esp_wifi_sta_wpa2_ent_set_password((uint8_t *)EAP_PASSWORD, strlen(EAP_PASSWORD)); //provide password
+  esp_wpa2_config_t config = WPA2_CONFIG_INIT_DEFAULT(); //set config to default (fixed for 2018 and Arduino 1.8.5+)
+  esp_wifi_sta_wpa2_ent_enable(&config); //set config to enable function (fixed for 2018 and Arduino 1.8.5+)
+  WiFi.begin(ssid); //connect to Eduroam function
+  WiFi.setHostname("ESP32Name"); //set Hostname for your device - not neccesary
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address set: "); 
+  Serial.println(WiFi.localIP()); //print LAN IP
+
+}
+void loop() {
+  delay(5000);
+  if (WiFi.status() != WL_CONNECTED) { //if we lost connection, retry
+    WiFi.begin(ssid);
+    delay(500);        
+}
+  Serial.print("Connecting to website: ");
+  Serial.println(host);
+  WiFiClient client;
+  if (!client.connect(host, 80)) { // HTTP connection on port 80
+    Serial.println("Connection lost! - Failed response");
+  }
+  String url = "/rele/rele1.txt"; //read .txt file    
+  Serial.print("Requesting URL: ");
+  Serial.println(url);
+  client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n\r\n");
+  unsigned long timeout = millis();
+  while (client.available() == 0) {
+    if (millis() - timeout > 5000) {
+      Serial.println("Client timed out! - retry");
+    }
+  }
+  while(client.available()) {
+    line = client.readStringUntil('\n');
+    Serial.println(line);  
+  }
+  Serial.println();
+  Serial.println("End connection");
+  client.stop();
+}