v1.6.3 to add WebSockets examples

#### Releases v1.6.3

1. Add `Async_WebSocketsServer`, `Async_HttpBasicAuth` and `MQTT` examples

Author: khoih-prog

examples/Async_HttpBasicAuth/Async_HttpBasicAuth.ino

@@ -0,0 +1,184 @@
+/****************************************************************************************************************************
+  Async_HttpBasicAuth.ino
+
+  For ENC28J60 Ethernet in ESP32 (ESP32 + ENC28J60)
+
+  AsyncWebServer_ESP32_ENC is a library for the Ethernet ENC28J60 in ESSP32 to run AsyncWebServer
+
+  Based on and modified from ESPAsyncWebServer (https://github.com/me-no-dev/ESPAsyncWebServer)
+  Built by Khoi Hoang https://github.com/khoih-prog/AsyncWebServer_ESP32_ENC
+  Licensed under GPLv3 license
+ *****************************************************************************************************************************/
+
+#if !( defined(ESP32) )
+  #error This code is designed for (ESP32 + ENC28J60) to run on ESP32 platform! Please check your Tools->Board setting.
+#endif
+
+#include <Arduino.h>
+
+#define _ASYNC_WEBSERVER_LOGLEVEL_       4
+
+// Enter a MAC address and IP address for your controller below.
+#define NUMBER_OF_MAC      20
+
+byte mac[][NUMBER_OF_MAC] =
+{
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x01 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x02 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x03 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x04 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x05 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x06 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x07 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x08 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x09 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0A },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0B },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0C },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0D },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0E },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0F },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x10 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x11 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x12 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x13 },
+  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x14 },
+};
+
+// Select the IP address according to your local network
+IPAddress myIP(192, 168, 2, 232);
+IPAddress myGW(192, 168, 2, 1);
+IPAddress mySN(255, 255, 255, 0);
+
+// Google DNS Server IP
+IPAddress myDNS(8, 8, 8, 8);
+
+//////////////////////////////////////////////////////////
+
+// Optional values to override default settings
+//#define SPI_HOST            1
+//#define SPI_CLOCK_MHZ       8
+
+// Must connect INT to GPIOxx or not working
+//#define INT_GPIO            4
+
+//#define MISO_GPIO           19
+//#define MOSI_GPIO           23
+//#define SCK_GPIO            18
+//#define CS_GPIO             5
+// Optional values to override default settings
+
+//////////////////////////////////////////////////////////
+
+#include <AsyncWebServer_ESP32_ENC.h>
+
+AsyncWebServer    server(80);
+
+const char* www_username = "admin";
+const char* www_password = "esp32_enc28j60";
+
+void setup()
+{
+	Serial.begin(115200);
+
+	while (!Serial && millis() < 5000);
+
+	delay(200);
+
+	Serial.print("\nStart Async_HTTPBasicAuth on ");
+	Serial.print(ARDUINO_BOARD);
+  Serial.print(" with ");
+  Serial.println(SHIELD_TYPE);
+  Serial.println(ASYNC_WEBSERVER_ESP32_ENC_VERSION);
+
+  AWS_LOGWARN(F("Default SPI pinout:"));
+  AWS_LOGWARN1(F("MOSI:"), MOSI_GPIO);
+  AWS_LOGWARN1(F("MISO:"), MISO_GPIO);
+  AWS_LOGWARN1(F("SCK:"),  SCK_GPIO);
+  AWS_LOGWARN1(F("CS:"),   CS_GPIO);
+  AWS_LOGWARN1(F("INT:"),  INT_GPIO);
+  AWS_LOGWARN1(F("SPI Clock (MHz):"), SPI_CLOCK_MHZ);
+  AWS_LOGWARN(F("========================="));
+
+  ///////////////////////////////////
+
+  // To be called before ETH.begin()
+  ESP32_ENC_onEvent();
+
+  // start the ethernet connection and the server:
+  // Use DHCP dynamic IP and random mac
+  uint16_t index = millis() % NUMBER_OF_MAC;
+
+  //bool begin(int MISO_GPIO, int MOSI_GPIO, int SCLK_GPIO, int CS_GPIO, int INT_GPIO, int SPI_CLOCK_MHZ,
+  //           int SPI_HOST, uint8_t *ENC28J60_Mac = ENC28J60_Default_Mac);
+  //ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST );
+  ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST, mac[index] );
+
+  // Static IP, leave without this line to get IP via DHCP
+  //bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = 0, IPAddress dns2 = 0);
+  //ETH.config(myIP, myGW, mySN, myDNS);
+
+  ESP32_ENC_waitForConnect();
+
+  ///////////////////////////////////
+
+	server.on("/", HTTP_GET, [](AsyncWebServerRequest * request)
+	{
+		if (!request->authenticate(www_username, www_password))
+		{
+			return request->requestAuthentication();
+		}
+
+		request->send(200, "text/plain", "Login OK");
+	});
+
+	server.begin();
+
+	Serial.print(F("Async_HttpBasicAuth started @ IP : "));
+	Serial.println(ETH.localIP());
+
+	Serial.print(F("Open http://"));
+	Serial.print(ETH.localIP());
+	Serial.println(F("/ in your browser to see it working"));
+
+	Serial.print(F("Login using username = "));
+	Serial.print(www_username);
+	Serial.print(F(" and password = "));
+	Serial.println(www_password);
+}
+
+void heartBeatPrint()
+{
+	static int num = 1;
+
+	Serial.print(F("."));
+
+	if (num == 80)
+	{
+		Serial.println();
+		num = 1;
+	}
+	else if (num++ % 10 == 0)
+	{
+		Serial.print(F(" "));
+	}
+}
+
+void check_status()
+{
+	static unsigned long checkstatus_timeout = 0;
+
+#define STATUS_CHECK_INTERVAL     10000L
+
+	// Send status report every STATUS_REPORT_INTERVAL (60) seconds: we don't need to send updates frequently if there is no status change.
+	if ((millis() > checkstatus_timeout) || (checkstatus_timeout == 0))
+	{
+		heartBeatPrint();
+		checkstatus_timeout = millis() + STATUS_CHECK_INTERVAL;
+	}
+}
+
+void loop()
+{
+	check_status();
+}