// Import libraries
#include "WiFi.h"
#include <PubSubClient.h>
#include <DHTesp.h>
// Define pins
#define MQTT_ON 14
#define MQTT_OFF 12
const int DHT_PIN = 15;
DHTesp dht;
/* Wokwi parameters */
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;
void setup_wifi(){
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password );
while (WiFi.status() != WL_CONNECTED){
Serial.print(".");
MQTT_state_OFF();
delay(300);
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
MQTT_state_ON();
}
void reconnect(){
while(!client.connected()){
Serial.println("Attempting MQTT connection . . .");
String clientID = "ESP32Client-";
clientID += String(random (0xffff),HEX);
if(client.connect(clientID.c_str())){
Serial.println("Connected");
client.publish("/Publish","Welcome");
client.subscribe("/Subscribe");
}else{
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.print("We´re trying again in 5 seconds");
delay(5000);
}
}
}
void callback(char* topic, byte* payload, unsigned int length){
Serial.print("Message received [");
Serial.print(topic);
Serial.print("] ");
for(int i = 0; i < length; i++){
Serial.print((char)payload[i]);
}
}
void setup() {
pinMode(MQTT_ON, OUTPUT);
pinMode(MQTT_OFF, OUTPUT);
dht.setup(DHT_PIN, DHTesp::DHT22);
setup_wifi();
client.setServer(mqtt_server,1883);
client.setCallback(callback);
Serial.begin(115200);
Serial.println("Inicializing WiFi...");
WiFi.mode(WIFI_STA);
Serial.print("Setup done");
}
void loop() {
if(!client.connected()){
reconnect();
}
client.loop();
unsigned long now = millis();
if(now - lastMsg > 2000){
lastMsg= now;
TempAndHumidity data = dht.getTempAndHumidity();
String temp = String (data.temperature, 2);
client.publish("/temp", temp.c_str());
String hum = String (data.humidity, 1);
client.publish("/hum", hum.c_str());
// Outputs
Serial.print("Temperature: ");
Serial.println(temp);
Serial.print("Humidity");
Serial.print(hum);
}
}
void MQTT_state_ON(){
digitalWrite(MQTT_ON,HIGH);
digitalWrite(MQTT_OFF,LOW);
Serial.println("MQTT_ON");
}
void MQTT_state_OFF(){
digitalWrite(MQTT_ON,LOW);
digitalWrite(MQTT_OFF,HIGH);
Serial.println("MQTT_OFF");
delay(100);
}