first upload

mqtt_nodered.ino

@@ -0,0 +1,104 @@
+  #include <WiFi.h>
+  #include <PubSubClient.h>
+
+  // Wi-Fi settings
+  const char* ssid        = "Guest WiFi";
+  const char* password    = "";
+
+  // MQTT server settings
+  const char* mqtt_server = "87.237.194.228";
+  const int   mqtt_port   = 1883;
+
+  WiFiClient espClient;
+  PubSubClient client(espClient);
+
+  // Callback function to handle incoming messages
+  void callback(char* topic, byte* payload, unsigned int length) {
+
+    Serial.print("Message arrived on topic: ");
+    Serial.println(topic);
+
+    Serial.print("Message: ");
+    String message;
+    for (unsigned int i = 0; i < length; i++) {
+      message += (char)payload[i];
+    }
+    Serial.println(message);
+
+    message.trim();
+    // You can add code here to handle the message content
+    // For example, control GPIO pins based on received commands
+
+    if(message == "on") {
+      Serial.println("Light On");
+    } else {
+      Serial.println("Light Off");
+    }
+
+  }
+
+  void setup_wifi() {
+
+    delay(10);
+    Serial.println();
+    Serial.print("Connecting to ");
+    Serial.println(ssid);
+
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(ssid, password);
+
+    while (WiFi.status() != WL_CONNECTED) {
+      delay(1000);
+      Serial.print(".");
+    }
+
+    Serial.println("\nWiFi connected!");
+    Serial.print("IP address: ");
+    Serial.println(WiFi.localIP());
+
+  }
+
+  void reconnect() {
+
+    while (!client.connected()) {
+      Serial.print("Attempting MQTT connection...");
+      if (client.connect("ESP32C6Client")) {
+        Serial.println("connected");
+        // Subscribe to the topic to receive messages
+        client.subscribe("Outgoing");
+      } else {
+        Serial.print("failed, rc=");
+        Serial.print(client.state());
+        Serial.println(" try again in 5 seconds");
+        delay(5000);
+      }
+    }
+
+  }
+
+  void setup() {
+
+    Serial.begin(115200);
+    setup_wifi();
+    client.setServer(mqtt_server, mqtt_port);
+    client.setCallback(callback);  // Set callback for incoming messages
+    
+  }
+
+  void loop() {
+
+    if(!client.connected()) {
+      reconnect();
+    }
+    client.loop();
+
+    // Publish a message to "outgoing" every 10 seconds
+    static unsigned long lastMsg = 0;
+    unsigned long now = millis();
+    if (now - lastMsg > 10000) {
+      lastMsg = now;
+      client.publish("Incoming", "Ping from ESP32-C6!");
+      Serial.println("Message sent to 'Incoming'.");
+    }
+
+  }