I made a fall classification model that detects two labels: ADL or FALL, download the binary which gives me edge impulse and it works correctly.
enter image description here
I want the label that comes out to be sent to an app via Bluetooth, that’s why I made the following sketch in Aruino IDE

#include "NDP.h"
#include "Nicla_System.h"
#include <ArduinoBLE.h>

// Alert Service
BLEService alertService("b6a9c10a-b242-4397-9afe-2688a86c8b5c");  // Bluetooth® Low Energy LED Service
BLEUnsignedCharCharacteristic alertCharacteristic("d86af06b-228d-4300-8f9f-ca30db6ee3ac", BLERead | BLENotify);

void blesend(char* label) {
  Serial.print("Label received: ");
  Serial.println(label);

  if (strcmp(label, "NN0:ADL") == 0) {
    alertCharacteristic.writeValue(1);
    Serial.println("ADL Detected!!!");
    NDP.noInterrupts();
    nicla::leds.begin();
    nicla::leds.setColor(green);
    delay(200);
    nicla::leds.end();
    NDP.interrupts();
  } else if (strcmp(label, "NN0:FALL") == 0) {
    alertCharacteristic.writeValue(2);
    Serial.println("FALL Detected!!!");
    NDP.noInterrupts();
    nicla::leds.begin();
    nicla::leds.setColor(green);
    delay(200);
    nicla::leds.end();
    NDP.interrupts();
  } else {
    Serial.println("No match found.");
  }
}

void ledGreenOn() {
  nicla::leds.begin();
  nicla::leds.setColor(green);
  delay(200);
  nicla::leds.setColor(off);
  nicla::leds.end();
}

void ledRedBlink() {
  while (1) {
    nicla::leds.begin();
    nicla::leds.setColor(red);
    delay(200);
    nicla::leds.setColor(off);
    delay(200);
    nicla::leds.end();
  }
}

void ledBlueBlink() {
  for (int i = 0; i <= 2; i++) {
    nicla::leds.begin();
    nicla::leds.setColor(blue);
    delay(200);
    nicla::leds.setColor(off);
    delay(200);
    nicla

First I uploaded the binary generated by edge impulse and then the sketch I made with arduino ide and the result is the following:

Loading synpackages
packages loaded
dsp firmware version: 19.2.0
package version: Model generated by Edge Impulse
pbi version: 3.2.3-0
num of labels: 2
labels: NN0:ADL, NN0:FALL
total deployed neural networks: 1
BLE advertising started
Waiting for central device...
Waiting for central device...
Waiting for central device...
Waiting for central device...
Connected to central device.
Sent test message.

In the app I have I only get 0 , no 1 (ADL) or 2 (FALL), any idea how I could fix this?. Thanks in advance