ESP32. FirebaseDB. Send. Receive. IDE Arduino

[Juan_Antonio]

2.- App Inventor sends number and text to ESP32 by Firebase. ESP32 sends to App Inventor random numbers.

p117_wemos_firebase.aia (3.1 KB)

• App Inventor sends number and text to ESP32 by FireBaseDB.
  ESP32/numero
  ESP32/texto

• ESP32 sends random numbers to App Inventor.
  ESP32/aleatorio

• FirebaseURL: https://kio4-3c240.firebaseio.com/

• ProjectBucket: ESP32
  

  

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- CODE ESP32

• Library: Firebase ESP32 Client
  
  

// Juan A. Villalpando
// http://kio4.com/arduino/117_Wemos_Firebase.htm

#include <FirebaseESP32.h>
#include <WiFi.h>
FirebaseData firebaseData;

const char* ssid = "Nombre_de_tu_Red_Wifi";
const char* password = "Clave_Red_Wifi";

String numero = "";
String texto = "";

unsigned long tiempo_actual = 0;

void setup() {
  Serial.begin(115200);
  delay(10);
  Serial.println();
  Serial.print("Connecting with ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
  delay(500);
  Serial.print(".");
  }
  
  Serial.println("");
  Serial.print("WiFi conected. IP: ");
  Serial.println(WiFi.localIP());

  Firebase.begin("https://kio4b-3c240.firebaseio.com/", "1lzi12VLgSecreto_de_la_base_de_datos");
}


void loop() {
  if (Firebase.getString(firebaseData, "/ESP32/numero")) {
      String numero_fb = firebaseData.stringData();
      if (numero_fb != numero) {
        numero = numero_fb;
        Serial.println(numero);
      }
    }

    if (Firebase.getString(firebaseData, "/ESP32/texto")) {
      String texto_fb = firebaseData.stringData();
      if (texto_fb != texto) {
        texto = texto_fb;
        Serial.println(texto);
      }
    }

// Send a random number every 3 seconds.
    if((millis()-tiempo_actual)>= 3000){
          String alea = (String) random(0,100);
          tiempo_actual = millis();
          Serial.println(alea);
          Firebase.setString(firebaseData, "/ESP32/aleatorio", alea);
    }
  
}