Added MQTT and OTA over Ethernet example to examples folder

examples/MQTT_And_OTA_Ethernet/MQTT_And_OTA_Ethernet.ino

@@ -0,0 +1,188 @@
+/****************************************************************************************************************************
+  MQTT_And_OTA_Ethernet.ino 
+    - Dead simple MQTT Client for Ethernet shields
+    - Allows for new sketch compiled bin to be uploaded over HTTP using AsyncElegantOTA
+
+  Based on MQTTClient_Auth
+ *****************************************************************************************************************************/
+
+/*
+  Basic MQTT example (without SSL!) with Authentication
+    This sketch demonstrates the basic capabilities of the library.
+    It connects to an MQTT server then:
+    - providing username and password
+    - publishes "hello world" to the topic "outTopic"
+    - subscribes to the topic "inTopic", printing out any messages
+      it receives. NB - it assumes the received payloads are strings not binary
+    It will reconnect to the server if the connection is lost using a blocking
+    reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
+    achieve the same result without blocking the main loop.
+
+  To use OTA:   
+    - Take note of what IP the board is on, you should be able to see this both in the serial monitor and in the MQTT messages when the board first starts.
+    - In the Arduino IDE, go to Sketch > Export compiled binary
+    - You should now see a build folder next to the MQTT_And_OTA_Ethernet.ino file
+    - Go into build\esp32.esp32.esp32 folder
+    - The file you will be uploading to do an OTA update is MQTT_And_OTA_Ethernet.ino.bin in that folder
+    - Go to http://192.168.X.X/update with a browser (whatever your board IP is that you noted earlier.)
+    - Click "Choose file" and browse to the MQTT_And_OTA_Ethernet.ino.bin that you made earlier when you clicked Export compiled binary
+*/
+
+#define DEBUG_ETHERNET_WEBSERVER_PORT       Serial
+#define _ETHERNET_WEBSERVER_LOGLEVEL_       3            // Debug Level from 0 to 4
+
+#include <WebServer_WT32_ETH01.h>         // https://github.com/khoih-prog/WebServer_WT32_ETH01/
+#include <AsyncTCP.h>                     // https://github.com/me-no-dev/AsyncTCP
+#include <ESPAsyncWebServer.h>            // https://github.com/me-no-dev/ESPAsyncWebServer
+#include <AsyncElegantOTA.h>              // https://github.com/ayushsharma82/AsyncElegantOTA
+
+// Libraries also needed: https://github.com/knolleary/pubsubclient
+
+AsyncWebServer server(80);
+
+// Set according to your local network if you need static IP
+// IPAddress myIP(192, 168, 1, 232);
+// IPAddress myGW(192, 168, 1, 1);
+// IPAddress mySN(255, 255, 255, 0);
+// IPAddress myDNS(8, 8, 8, 8);
+
+#include <PubSubClient.h>
+
+// MQTT Settings
+const char *mqttServer     = "192.168.1.25";                   // Broker address
+const char *mqttBrokerUser = "YOUR_MQTT_USERNAME";             // Username to connect to your MQTT broker
+const char *mqttBrokerPass = "YOUR_MQTT_PASSWORD";             // Password to connect to your MQTT broker
+const char *ID             = "MQTTClient_SSL-Client";          // Name of our device, must be unique
+const char *TOPIC          = "topics/test/esp32";              // Topic to publish to
+const char *subTopic       = "topics/MQTT_Sub";                // Topic to subcribe to
+
+WiFiClient    ethClient;
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+
+  // Using this if Serial debugging is not necessary or not using Serial port
+  //while (!Serial && (millis() < 3000));
+
+  Serial.print("\nStarting MQTT_And_OTA_Ethernet on " + String(ARDUINO_BOARD));
+  Serial.println(" with " + String(SHIELD_TYPE));
+  Serial.println(WEBSERVER_WT32_ETH01_VERSION);
+
+  // To be called before ETH.begin()
+  WT32_ETH01_onEvent();
+
+  ETH.begin(ETH_PHY_ADDR, ETH_PHY_POWER);
+
+  // Static IP, leave without this line to get IP via DHCP
+  // ETH.config(myIP, myGW, mySN, myDNS);
+
+  WT32_ETH01_waitForConnect();
+
+  // Note - the default maximum packet size is 128 bytes. If the
+  // combined length of clientId, username and password exceed this use the
+  // following to increase the buffer size:
+  // client.setBufferSize(255);
+
+  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
+    request->send(200, "text/plain", "Hi! I am ESP32.");
+  });
+
+  AsyncElegantOTA.begin(&server);    // Start ElegantOTA
+  server.begin();
+
+  Serial.println();
+  Serial.println("HTTP server started with MAC: " + ETH.macAddress() + ", at IPv4: " + ETH.localIP().toString());
+  Serial.println();
+}
+
+void callback(char* topic, byte* payload, unsigned int length) 
+{
+  Serial.print("Message arrived [");
+  Serial.print(topic);
+  Serial.print("] ");
+
+  for (unsigned int i = 0; i < length; i++) 
+  {
+    Serial.print((char)payload[i]);
+  }
+
+  Serial.println();
+}
+
+PubSubClient  client(mqttServer, 1883, callback, ethClient);
+
+void reconnect()
+{
+  // Loop until we're reconnected
+  while (!client.connected())
+  {
+    Serial.print("Attempting MQTT connection to ");
+    Serial.print(mqttServer);
+
+    // Attempt to connect
+    if (client.connect("arduino", mqttBrokerUser, mqttBrokerPass))
+    {
+      Serial.println("...connected");
+
+      // Once connected, publish an announcement...
+      String data = "Hello from MQTTClient_SSL on " + String(BOARD_NAME) + ", at IPv4: " + ETH.localIP().toString();
+
+      client.publish(TOPIC, data.c_str());
+
+      //Serial.println("Published connection message successfully!");
+      //Serial.print("Subcribed to: ");
+      //Serial.println(subTopic);
+
+      // ... and resubscribe
+      client.subscribe(subTopic);
+      // for loopback testing
+      client.subscribe(TOPIC);
+    }
+    else
+    {
+      Serial.print("...failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+#define MQTT_PUBLISH_INTERVAL_MS       5000L
+
+unsigned long lastMsg = 0;
+
+void loop() 
+{
+  String data         = "Hello from v00 MQTT_And_OTA_Ethernet on: " + String(BOARD_NAME) + " with " + String(SHIELD_TYPE);
+  const char *pubData = data.c_str();
+
+  static unsigned long now;
+
+  if (!client.connected()) 
+  {
+    reconnect();
+  }
+
+  // Sending Data
+  now = millis();
+
+  if (now - lastMsg > MQTT_PUBLISH_INTERVAL_MS)
+  {
+    lastMsg = now;
+
+    if (!client.publish(TOPIC, pubData))
+    {
+      Serial.println("Message failed to send.");
+    }
+
+    Serial.print("Message Send : " + String(TOPIC) + " => ");
+    Serial.println(data);
+  }
+
+  client.loop();
+}