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firmware/arduino/get-started/libraries/EspMQTTClient/examples/SimpleMQTTClient/SimpleMQTTClient.ino

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+/*
+  SimpleMQTTClient.ino
+  The purpose of this exemple is to illustrate a simple handling of MQTT and Wifi connection.
+  Once it connects successfully to a Wifi network and a MQTT broker, it subscribe to a topic and send a message to it.
+  It will also send a message delayed 5 seconds later.
+*/
+
+#include "EspMQTTClient.h"
+
+EspMQTTClient client(
+  "WifiSSID",
+  "WifiPassword",
+  "192.168.1.100",  // MQTT Broker server ip
+  "MQTTUsername",   // Can be omitted if not needed
+  "MQTTPassword",   // Can be omitted if not needed
+  "TestClient",     // Client name that uniquely identify your device
+  1883              // The MQTT port, default to 1883. this line can be omitted
+);
+
+void setup()
+{
+  Serial.begin(115200);
+
+  // Optionnal functionnalities of EspMQTTClient : 
+  client.enableDebuggingMessages(); // Enable debugging messages sent to serial output
+  client.enableHTTPWebUpdater(); // Enable the web updater. User and password default to values of MQTTUsername and MQTTPassword. These can be overrited with enableHTTPWebUpdater("user", "password").
+  client.enableLastWillMessage("TestClient/lastwill", "I am going offline");  // You can activate the retain flag by setting the third parameter to true
+}
+
+// This function is called once everything is connected (Wifi and MQTT)
+// WARNING : YOU MUST IMPLEMENT IT IF YOU USE EspMQTTClient
+void onConnectionEstablished()
+{
+  // Subscribe to "mytopic/test" and display received message to Serial
+  client.subscribe("mytopic/test", [](const String & payload) {
+    Serial.println(payload);
+  });
+
+  // Subscribe to "mytopic/wildcardtest/#" and display received message to Serial
+  client.subscribe("mytopic/wildcardtest/#", [](const String & topic, const String & payload) {
+    Serial.println("(From wildcard) topic: " + topic + ", payload: " + payload);
+  });
+
+  // Publish a message to "mytopic/test"
+  client.publish("mytopic/test", "This is a message"); // You can activate the retain flag by setting the third parameter to true
+
+  // Execute delayed instructions
+  client.executeDelayed(5 * 1000, []() {
+    client.publish("mytopic/wildcardtest/test123", "This is a message sent 5 seconds later");
+  });
+}
+
+void loop()
+{
+  client.loop();
+}