How do you save data received through ble?

[111493]

Hey all,
Im using the following code in arduino to send sensor readings via ble:

#include <ArduinoBLE.h>

//----------------------------------------------------------------------------------------------------------------------
// BLE UUIDs
//----------------------------------------------------------------------------------------------------------------------

#define BLE_UUID_SENSOR_SERVICE "82D20000-87F8-C79D-9E63-A091F4171879"
#define BLE_UUID_PRESSURE "82D20001-87F8-C79D-9E63-A091F4171879"

//----------------------------------------------------------------------------------------------------------------------
// BLE
//----------------------------------------------------------------------------------------------------------------------

#define BLE_DEVICE_NAME "Arduino Nano 33 IoT"
#define BLE_LOCAL_NAME "Arduino Nano 33 IoT"

BLEService sensorService( BLE_UUID_SENSOR_SERVICE );
BLEShortCharacteristic pressureCharacteristic( BLE_UUID_PRESSURE, BLERead | BLENotify );

//----------------------------------------------------------------------------------------------------------------------
// I/O and App
//----------------------------------------------------------------------------------------------------------------------

#define BLE_LED_PIN LED_BUILTIN
#define PRESSURE_SENSOR_PIN A0

uint16_t averagePressure = 0;
bool updatePressureCharacteristic = false;

void setup()
{
Serial.begin( 9600 );
while ( !Serial );

pinMode( BLE_LED_PIN, OUTPUT );
pinMode( PRESSURE_SENSOR_PIN, INPUT );
analogReadResolution( 10 );

if ( !setupBleMode() )
{
Serial.println( "Failed to initialize BLE!" );
while ( 1 );
}
else
{
Serial.println( "BLE initialized. Waiting for clients to connect." );
}
}

void loop()
{
bleTask();
sensorTask();
}

void sensorTask()
{
#define SENSOR_SAMPLING_INTERVAL 50
#define SAMPLE_BUFFER_SIZE 10

static uint16_t sampleBuffer[SAMPLE_BUFFER_SIZE] = { 0 };
static uint32_t previousMillis = 0;
static uint32_t sampleIndex = 0;

uint32_t currentMillis = millis();
if ( currentMillis - previousMillis >= SENSOR_SAMPLING_INTERVAL )
{
previousMillis = currentMillis;
uint16_t currentPressure = analogRead( PRESSURE_SENSOR_PIN );
sampleBuffer[sampleIndex] = currentPressure;
sampleIndex = ( sampleIndex + 1 ) % SAMPLE_BUFFER_SIZE;

if ( sampleIndex == 0 )
{
  uint32_t bufferTotal = 0;
  for ( uint32_t i = 0; i < SAMPLE_BUFFER_SIZE; i++ )
  {
    bufferTotal += sampleBuffer[i];
  }
  averagePressure = (uint16_t) round( bufferTotal / SAMPLE_BUFFER_SIZE );
  updatePressureCharacteristic = true;
}

}
}

bool setupBleMode()
{
if ( !BLE.begin() )
{
return false;
}

// set advertised local name and service UUID
BLE.setDeviceName( BLE_DEVICE_NAME );
BLE.setLocalName( BLE_LOCAL_NAME );
BLE.setAdvertisedService( sensorService );

// add characteristics
sensorService.addCharacteristic( pressureCharacteristic );

// add service
BLE.addService( sensorService );

// set the initial value for the characeristics
pressureCharacteristic.writeValue( averagePressure );

// set BLE event handlers
BLE.setEventHandler( BLEConnected, blePeripheralConnectHandler );
BLE.setEventHandler( BLEDisconnected, blePeripheralDisconnectHandler );

// start advertising
BLE.advertise();

return true;
}

void bleTask()
{
#define BLE_UPDATE_INTERVAL 10
static uint32_t previousMillis = 0;

uint32_t currentMillis = millis();
if ( currentMillis - previousMillis >= BLE_UPDATE_INTERVAL )
{
previousMillis = currentMillis;
BLE.poll();
}

if ( updatePressureCharacteristic )
{
updatePressureCharacteristic = false;
pressureCharacteristic.writeValue( averagePressure );
}
}

void blePeripheralConnectHandler( BLEDevice central )
{
digitalWrite( BLE_LED_PIN, HIGH );
Serial.print( "Connected to central: " );
Serial.println( central.address() );
}

void blePeripheralDisconnectHandler( BLEDevice central )
{
digitalWrite( BLE_LED_PIN, LOW );
Serial.print( "Disconnected from central: " );
Serial.println( central.address() );
}

I checked the arduino code using BLE Scanner and I mange to receive the data every time it is sent.
I created a simple app to check if I can read the data that is being sent and with no luck (the arduino connects to the app but no data is showed).

as you can see I tryed several diffrent blocks with no luck.
what am I missing?