include MQTT

arduino/MQTT/MQTT.ino

@@ -0,0 +1,111 @@
+// Board: WiFiduino
+
+#include <ArduinoMqttClient.h>
+// #include <WiFiNINA.h>
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+char ssid[] = "xxx";           // your network SSID
+char password[] = "xxx";  // your network password
+
+WiFiClient espClient;
+MqttClient mqttClient(espClient);
+PubSubClient mqtt_client(espClient);
+
+
+const char broker[] = "mqtt.klank.school";
+int port = 8883;
+const char topic[] = "real_unique_topic";
+const char topic2[] = "real_unique_topic_2";
+const char topic3[] = "real_unique_topic_3";
+const char *mqtt_topic = "emqx/esp8266/led";  //
+const char *mqtt_username = "xxx";
+const char *mqtt_password = "xxx";
+
+void setup() {
+  //Initialize serial and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ;  // wait for serial port to connect. Needed for native USB port only
+  }
+  // attempt to connect to Wifi network:
+  Serial.print("Attempting to connect to SSID: ");
+  // WiFi.mode(WIFI_STA);
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.println(". stil not");
+  }
+
+  Serial.println("You're connected to the network");
+  Serial.println();
+
+  Serial.print("Attempting to connect to the MQTT broker: ");
+  Serial.println(broker);
+
+   while (!mqtt_client.connected()) {
+      String client_id = "esp8266-client-" + String(WiFi.macAddress());
+      Serial.printf("Connecting to MQTT Broker as %s.....\n", client_id.c_str());
+      if (mqtt_client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
+          Serial.println("Connected to MQTT broker");
+          mqtt_client.subscribe(mqtt_topic);
+          // Publish message upon successful connection
+          mqtt_client.publish(mqtt_topic, "Hi EMQX I'm ESP8266 ^^");
+      } else {
+          Serial.print("Failed to connect to MQTT broker, rc=");
+          Serial.print(mqtt_client.state());
+          Serial.println(" try again in 5 seconds");
+          delay(5000);
+      }
+  }
+
+  Serial.println("You're connected to the MQTT broker!");
+  Serial.println();
+
+  // set the message receive callback
+  mqttClient.onMessage(onMqttMessage);
+
+  Serial.print("Subscribing to topic: ");
+  Serial.println(topic);
+  Serial.println();
+
+  // subscribe to a topic
+  mqttClient.subscribe(topic);
+  mqttClient.subscribe(topic2);
+  mqttClient.subscribe(topic3);
+
+  // topics can be unsubscribed using:
+  // mqttClient.unsubscribe(topic);
+
+  Serial.print("Topic: ");
+  Serial.println(topic);
+  Serial.print("Topic: ");
+  Serial.println(topic2);
+  Serial.print("Topic: ");
+  Serial.println(topic3);
+
+  Serial.println();
+}
+
+void loop() {
+  // call poll() regularly to allow the library to receive MQTT messages and
+  // send MQTT keep alive which avoids being disconnected by the broker
+  mqttClient.poll();
+}
+
+void onMqttMessage(int messageSize) {
+  // we received a message, print out the topic and contents
+  Serial.println("Received a message with topic '");
+  Serial.print(mqttClient.messageTopic());
+  Serial.print("', length ");
+  Serial.print(messageSize);
+  Serial.println(" bytes:");
+
+  // use the Stream interface to print the contents
+  while (mqttClient.available()) {
+    Serial.print((char)mqttClient.read());
+  }
+  Serial.println();
+  Serial.println();
+}