holaiot.ino

#include <EEPROM.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include <Adafruit_INA219.h>
 
const char* ssid = "Tu Wifi";
const char* password = "tupassword";
const char* mqtt_server = "tuservidor";
 
WiFiClient espClient;
PubSubClient client(espClient);
 
const byte ledPin = 0; // pin con el LED
 
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Mensaje recibido [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i=0;i<length;i++) {
    char receivedChar = (char)payload[i];
    Serial.print(receivedChar);
 if (receivedChar == '0')
  // En el ESP8266 Huzzah el led está invertido
  digitalWrite(ledPin, HIGH);
  if (receivedChar == '1')
   digitalWrite(ledPin, LOW);
  }
  Serial.println();
}
 
void reconnect() {
  while (!client.connected()) {
    Serial.print("Intentando conectarse...");
    if (client.connect("ESP8266 Client")) {
      Serial.println("conectado");
      client.subscribe("ledStatus");
    } else {
      Serial.print("falla, rc=");
      Serial.print(client.state());
      Serial.println(" reintentaremos en 5 segundos");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(9600);
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
}
 
void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
}