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- // contoh penggunaan di PC
- // matikan Lampu
- // hendri@MyLinux:~$ mosquitto_pub -t room/lamp -m "off"
- // nyalakan lampu
- // hendri@MyLinux:~$ mosquitto_pub -t room/lamp -m "on"
- // mosquitto_sub -d -t room/humidity
- // mosquitto_sub -d -t room/temperature
- #include <ESP8266WiFi.h>
- #include <PubSubClient.h>
- // Change the credentials below, so your ESP8266 connects to your router
- const char* ssid = "MyWIFI";
- const char* password = "aremania";
- // Change the variable to your Raspberry Pi IP address, so it connects to your MQTT broker
- const char* mqtt_server = "192.168.1.6";
- // Initializes the espClient. You should change the espClient name if you have multiple ESPs running in your home automation system
- WiFiClient espClient;
- PubSubClient client(espClient);
- // Timers auxiliar variables
- long now = millis();
- long lastMeasure = 0;
- // Don't change the function below. This functions connects your ESP8266 to your router
- void setup_wifi() {
- delay(10);
- // We start by connecting to a WiFi network
- Serial.println();
- Serial.print("Connecting to ");
- Serial.println(ssid);
- WiFi.begin(ssid, password);
- while (WiFi.status() != WL_CONNECTED) {
- delay(500);
- Serial.print(".");
- }
- Serial.println("");
- Serial.print("WiFi connected - ESP IP address: ");
- Serial.println(WiFi.localIP());
- }
- // This functions is executed when some device publishes a message to a topic that your ESP8266 is subscribed to
- // Change the function below to add logic to your program, so when a device publishes a message to a topic that
- // your ESP8266 is subscribed you can actually do something
- void callback(String topic, byte* message, unsigned int length) {
- Serial.print("Message arrived on topic: ");
- Serial.print(topic);
- Serial.print(". Message: ");
- String messageTemp;
- for (int i = 0; i < length; i++) {
- Serial.print((char)message[i]);
- messageTemp += (char)message[i];
- }
- Serial.println();
- // Feel free to add more if statements to control more GPIOs with MQTT
- // If a message is received on the topic room/lamp, you check if the message is either on or off. Turns the lamp GPIO according to the message
- if(topic=="room/lamp"){
- Serial.print("Changing Room lamp to ");
- if(messageTemp == "on"){
- digitalWrite(LED_BUILTIN, LOW);
- Serial.print("On");
- }
- else if(messageTemp == "off"){
- digitalWrite(LED_BUILTIN, HIGH);
- Serial.print("Off");
- }
- }
- Serial.println();
- }
- // This functions reconnects your ESP8266 to your MQTT broker
- // Change the function below if you want to subscribe to more topics with your ESP8266
- void reconnect() {
- // Loop until we're reconnected
- while (!client.connected()) {
- Serial.print("Attempting MQTT connection...");
- // Attempt to connect
- /*
- YOU MIGHT NEED TO CHANGE THIS LINE, IF YOU'RE HAVING PROBLEMS WITH MQTT MULTIPLE CONNECTIONS
- To change the ESP device ID, you will have to give a new name to the ESP8266.
- Here's how it looks:
- if (client.connect("ESP8266Client")) {
- You can do it like this:
- if (client.connect("ESP1_Office")) {
- Then, for the other ESP:
- if (client.connect("ESP2_Garage")) {
- That should solve your MQTT multiple connections problem
- */
- if (client.connect("ESP8266Client")) {
- Serial.println("connected");
- // Subscribe or resubscribe to a topic
- // You can subscribe to more topics (to control more LEDs in this example)
- client.subscribe("room/lamp");
- } else {
- Serial.print("failed, rc=");
- Serial.print(client.state());
- Serial.println(" try again in 5 seconds");
- // Wait 5 seconds before retrying
- delay(5000);
- }
- }
- }
- // The setup function sets your ESP GPIOs to Outputs, starts the serial communication at a baud rate of 115200
- // Sets your mqtt broker and sets the callback function
- // The callback function is what receives messages and actually controls the LEDs
- void setup() {
- pinMode(LED_BUILTIN, OUTPUT);
- Serial.begin(115200);
- setup_wifi();
- client.setServer(mqtt_server, 1883);
- client.setCallback(callback);
- }
- // For this project, you don't need to change anything in the loop function. Basically it ensures that you ESP is connected to your broker
- void loop() {
- if (!client.connected()) {
- reconnect();
- }
- if(!client.loop())
- client.connect("ESP8266Client");
- now = millis();
- // Publishes new temperature and humidity every 30 seconds
- if (now - lastMeasure > 30000) {
- lastMeasure = now;
- // Publishes Temperature and Humidity values
- client.publish("room/temperature", "27C");
- client.publish("room/humidity", "10%");
- }
- }
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