I'm currently trying to send data from esp32 to my android app that I made. The sensor readings are showing in the serial monitor, however, what's showing on my app are either @ or &. Please help and thank you. I'm new to bluetooth coding.

Here's the code:

#include "BluetoothSerial.h" int sensorPin = 35;
int sensorreading;

BluetoothSerial SerialBT;

void setup ()
{ Serial.begin(115200); SerialBT.begin("ESP32_ABO"); pinMode (sensorPin, INPUT); } void loop () { sensorreading = analogRead(sensorPin); String toSend = String (sensorreading); sendData(toSend);}

void sendData(String textToSend){

Serial.print(sensorreading); SerialBT.write(textToSend[sensorreading]); } delay(1000);}

I'm currently trying to send data from esp32 to my android app that I made. The sensor readings are showing in the serial monitor, however, what's showing on my app are either @ or &. Please help and thank you. I'm new to bluetooth coding.

Here's the code:

#include "BluetoothSerial.h" 
int sensorPin = 35;  
int sensorreading;

BluetoothSerial SerialBT;

void  setup ()  
{
    Serial.begin(115200);
    SerialBT.begin("ESP32_ABO");
    pinMode (sensorPin, INPUT);
}
void  loop ()
{ 
   sensorreading = analogRead(sensorPin); 
   String toSend = String (sensorreading);
   sendData(toSend);}

void sendData(String textToSend){
   
   Serial.print(sensorreading); 
   SerialBT.write(textToSend[sensorreading]);
}
delay(1000);}