Switch Google Assistant

functions.js

'use strict';
 
const functions = require('firebase-functions');
const {WebhookClient} = require('dialogflow-fulfillment');
const {Card, Suggestion} = require('dialogflow-fulfillment');
const admin = require('firebase-admin');
admin.initializeApp();

const db = admin.database();
const ref = db.ref("/switch");

process.env.DEBUG = 'dialogflow:debug';
 
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
    const agent = new WebhookClient({ request, response });
    
    function turnOn(agent) {
        ref.set({value: 1});
        agent.add("Encendido, ¿algo más?");
    }
    
    function turnOff(agent) {
        ref.set({value: 0});
        agent.add("Apagado, ¿algo más?");
    }
    
    let intentMap = new Map();
    intentMap.set('turn_on', turnOn);
    intentMap.set('turn_off', turnOff);
    
    agent.handleRequest(intentMap);
});

switch.ino

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>

const char* WIFI_SSID = "SSID";
const char* WIFI_PASS = "PASS";

const String URL = "FIREBASE_URL";
const String FINGERPRINT = "YOUR_FINGERPRINT";

const int SWITCH = D4;
const int HTTP_OK = 200;
const int LOOP_DELAY = 500;

int switchValue = 0;

void setup() {
  Serial.begin(115200);
  pinMode(SWITCH, OUTPUT);

  WiFi.begin(WIFI_SSID, WIFI_PASS);

  Serial.println();
  while(WiFi.status() != WL_CONNECTED) {
    delay(LOOP_DELAY);
    Serial.print(".");
  }

  Serial.println("ESP connected!");
}

void loop() {
  int newValue = getSwitchValue();

  if(newValue != switchValue) {
    switchValue = newValue;
    digitalWrite(SWITCH, switchValue);
    Serial.println("New switch value: " + String(switchValue));
  }

  delay(LOOP_DELAY);
}

int getSwitchValue() {
  HTTPClient client;
  client.begin(URL, FINGERPRINT);

  int responseCode = client.GET();

  int newValue = switchValue;

  if(responseCode == HTTP_OK) {
    newValue = client.getString().toInt();
  }

  return newValue;
}