Send Json to Arduino (ESP32) serial via Bluetooth (need a little help here please)

MIT App Inventor Help
8

I commented in my previous message that it is best to make a small program to study its operation, I also commented that Slider is not a good option to send information, unless you use it with a Clock.
Here is a small example for you to study how to send information by BT.

btesp32ww
btesp32ww780×752 51.1 KB

#include "BluetoothSerial.h"
BluetoothSerial SerialBT;

char caracter;
String palabra;

void setup(){
  Serial.begin(9600);
  SerialBT.begin("ESP32test");
}

void loop(){
  if(SerialBT.available()) {
  caracter = SerialBT.read();
  palabra = palabra + caracter;

  if(caracter == '*') {    
     palabra = palabra.substring(0, palabra.length() - 1); // Quita último caracter * 
     Serial.println(palabra);
     palabra = "";
  }
    delay(100); 
   } // =>Fin del available
}