MQTT Publisher

ariefhendra

Jul 2nd, 2025

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Arduino 2.02 KB | Source Code | 0 0

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#include <WiFi.h>
#include <PubSubClient.h>
#include "DHTesp.h"
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";
const char* topic_temp = "DHT22/suhu";
const char* topic_hum = "DHT22/kelembapan";
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
float temp = 0;
float hum = 0;
int value = 0;
const int DHT_PIN = 15;
DHTesp dhtSensor;
void setup_wifi()
{
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void reconnect()
{
while (!client.connected())
{
Serial.print("Attempting MQTT connection...");
String clientId = "MqttDashboard-4720445";
clientId += String(random(0xffff), HEX);
if (client.connect(clientId.c_str()))
{
Serial.println("Connected");
}
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, 1883);
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}
void loop()
{
if (!client.connected())
{
reconnect();
}
client.loop();
unsigned long now = millis();
if (now - lastMsg > 2000) {
lastMsg = now;
TempAndHumidity data = dhtSensor.getTempAndHumidity();
String temp = String(data.temperature, 2);
Serial.print("Temperature: ");
Serial.println(temp);
client.publish(topic_temp, temp.c_str());
String hum = String(data.humidity, 1);
Serial.print("Humidity: ");
Serial.println(hum);
client.publish(topic_hum, hum.c_str());
}
}

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