#include <PubSubClient.h>
#include <WiFi.h>
#define RELAY_PIN 22
#define RELAY_PIN_1 23
const char* ssid="Wokwi-GUEST";
const char* password="";
const char* mqtt_server= "66.29.142.107";
WiFiClient espClient_diego;
PubSubClient client(espClient_diego);
long lastMsg=0;
void setup()
{
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server,1883);
client.setCallback(callback);
pinMode(RELAY_PIN, OUTPUT);
pinMode(RELAY_PIN_1, OUTPUT);
}
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected - IP address: ");
Serial.println(WiFi.localIP());
}
void reconnect(){
while(!client.connected()){
Serial.print("Intentando conectar a MQTT broker...");
if (client.connect("ESP32Client")){
Serial.println("conectado");
client.subscribe("RELAY_PIN");
client.subscribe("RELAY_PIN_1");
}else{
Serial.print("fallido, rc=");
Serial.print(client.state());
Serial.println("Intente de nuevo en 5s");
delay(5000);
}
}
}
void callback(char* topic, byte* message,
unsigned int length){
Serial.print("Mensaje recibido en el topico:");
Serial.print(topic);
Serial.print(". Mensage: ");
String messageTemp;
for (int i=0; i < length; i++){
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
if (String(topic) == "RELAY_PIN"){
Serial.print("Cambiando la salida a :");
if(messageTemp=="true"){
Serial.println("on");
digitalWrite(RELAY_PIN, HIGH);
}
else if (messageTemp=="false"){
Serial.println("off");
digitalWrite(RELAY_PIN, LOW);
}
}
if (String(topic) == "RELAY_PIN_1"){
Serial.print("Cambiando la salida 1 a :");
if(messageTemp=="true"){
Serial.println("on");
digitalWrite(RELAY_PIN_1, HIGH);
}
else if (messageTemp=="false"){
Serial.println("off");
digitalWrite(RELAY_PIN_1, LOW);
}
}
}
void loop() {
if(!client.connected()){
reconnect();
}
client.loop();
long now=millis();
if (now - lastMsg>2000){
lastMsg=now;
}
}