#include <WiFi.h>
#include <PubSubClient.h>
#define LED 22
// WiFi
const char *ssid = "Wokwi-GUEST"; // Enter your WiFi name
const char *password = ""; // Enter WiFi password
// MQTT Broker
const char *mqtt_broker = "broker.mqtt.cool";
const char *topic = "/Faikar/actuate_lamp";
const char *mqtt_username = "faikar";
const char *mqtt_password = "faikar";
const int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
void turn_on_lamp(){
digitalWrite(LED, HIGH);
Serial.println("Turning on lamp");
}
void turn_off_lamp(){
digitalWrite(LED, LOW);
}
void setup() {
//setup LED
pinMode(LED, OUTPUT);
// Set software serial baud to 115200;
Serial.begin(115200);
// connecting to a WiFi network
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Connecting to WiFi..");
}
Serial.println("Connected to the WiFi network");
//connecting to a mqtt broker
client.setServer(mqtt_broker, mqtt_port);
client.setCallback(callback);
while (!client.connected()) {
String client_id = "esp32-client-";
client_id += String(WiFi.macAddress());
Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str());
if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
Serial.println("Public emqx mqtt broker connected");
} else {
Serial.print("failed with state ");
Serial.print(client.state());
delay(2000);
}
}
// publish and subscribe
client.publish(topic, "Turn Off");
client.subscribe(topic);
}
void callback(char *topic, byte *payload, unsigned int length) {
Serial.print("Message arrived in topic: ");
Serial.println(topic);
Serial.print("Message:");
char pesan[length + 1]; // +1 untuk null-terminator
for (int i = 0; i < length; i++) {
Serial.print((char) payload[i]);
pesan[i] = (char) payload[i];
}
pesan[length] = '\0'; // Menambahkan null-terminator pada akhir string
Serial.println(pesan);
if(strcmp(pesan, "Turn on") == 0)
turn_on_lamp();
else if(strcmp(pesan, "Turn off") == 0)
turn_off_lamp();
Serial.println("-----------------------");
}
void loop() {
client.loop();
}