I need help with my app

mts_pcc · February 11, 2022, 4:21pm

Hello, I am using an mkr nano 33 ble, to send some data to my phone. I thought to use an app to display received data on my phone. The connection between is working

, but dont't display my data.
on nrf app , I recieved data

here is the code, it is the basic code, the interest is the application on smartphone.

#include <ArduinoBLE.h>

static const char* greeting = "50";

BLEService greetingService("180C"); 

BLEStringCharacteristic greetingCharacteristic("2A56",BLERead, 13); //caracteristicile mesajului

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

  pinMode(LED_BUILTIN, OUTPUT); // initialize the built-in LED pin

  if (!BLE.begin()) { 
    Serial.println("Bluetooth-ul nu functioneaza");
    while (1);
  }

  BLE.setLocalName("Nano33BLE - Disertatie");  // numele conexiunii
  BLE.setAdvertisedService(greetingService); 
  greetingService.addCharacteristic(greetingCharacteristic); 
  BLE.addService(greetingService); 
  greetingCharacteristic.setValue(greeting); 

  BLE.advertise();  // Start advertising
  Serial.print("Adresa MAC a dispozitivului: ");
  Serial.println(BLE.address());
  Serial.println("Asteptam sa se conecteze...");
}

void loop() {
  BLEDevice central = BLE.central();  

  // conectarea cu terminalul
  if (central) {
    Serial.print("Adresa MAC a terminalului: ");
 
    Serial.println(central.address());
    // se aprinde ledul cand exista conexiune
    digitalWrite(LED_BUILTIN, HIGH);

    while (central.connected()){}
    
    // se stinge ledul cand nu exista conexiune
    digitalWrite(LED_BUILTIN, LOW);
    Serial.print("Deconectat de la adresa MAC a terminalului: ");
    Serial.println(central.address());
  }
}

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