MQTT Subscriber

ariefhendra

Jul 2nd, 2025

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Arduino 1.88 KB | Source Code | 0 0

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#include <WiFi.h>
#include <PubSubClient.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);
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 callback(char* topic, byte* payload, unsigned int length)
{
Serial.print("Message arrived in topic: ");
Serial.println(topic);
Serial.print("Message:");
for (int i = 0; i < length; i++)
{
Serial.print((char)payload[i]);
}
Serial.println();
Serial.println("-----------------------");
}
void reconnect()
{
while (!client.connected())
{
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "mqtt-explorer-584bcd18";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str()))
{
Serial.println("Connected");
client.subscribe(topic_temp);
client.subscribe(topic_hum);
}
else
{
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup()
{
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void loop()
{
if (!client.connected())
{
reconnect();
}
client.loop();
}

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