#include <WiFi.h>
#include <PubSubClient.h>
const char *ssid = "Wokwi-GUEST";
const char *password = "";
const char *mqtt_broker = "0.tcp.ap.ngrok.io";
const char *topic = "tester";
const char *mqtt_username = "yy";
const char *mqtt_password = "alifqi";
const int mqtt_port = 12704;
#define BUTTON_PIN 2
int currentState;
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
pinMode(BUTTON_PIN, INPUT_PULLUP);
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println("Terhubung ke Wi-Fi");
client.setServer(mqtt_broker, mqtt_port);
client.setCallback(callback);
while (!client.connected()) {
String client_id = "esp32-node-button";
if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
Serial.println("Terhubung ke MQTT Broker");
Serial.println("Tekan tombol untuk mengirim pesan");
}
}
}
void callback(char *topic, byte *payload, unsigned int length) {
Serial.print("Topic : ");
Serial.println(topic);
Serial.print("Pesan : ");
for (int i = 0; i < length; i++) {
Serial.print((char) payload[i]);
}
Serial.println();
Serial.println("--------------------------------");
}
void loop() {
client.loop();
currentState = digitalRead(BUTTON_PIN);
if(currentState == LOW) {
client.publish(topic, "Seseorang menekan tombol");
client.subscribe(topic);
}
delay(100);
}