Error in connection with server "BLE_client". Reboot

[duvancast]

Hello everyone, I hope someone can help me. I am new with the ESP32 board, and I am trying to make a project with a sensor, to perform the reading of the data using the ESP32 board. I am following the example provided by arduino "BLE_client".
I make the connection using the MAC address of my sensor, which is "XSens DOT", but at the moment of making the connection, I get the following error in the serial monitor:

15:56:29.936 -> Starting Arduino BLE Client application...
15:56:33.338 -> BLE Advertised Device found: Name: Xsens DOT, Address: d4:22:cd:00:45:8b, appearance: 1088, manufacturer data: 86088b4500cd22d4
15:56:33.385 -> Forming a connection to d4:22:cd:00:45:8b
15:56:33.385 -> - Created client
15:56:33.761 -> - Connected to server
15:56:36.975 -> - Found our service
15:56:36.975 ->
15:56:36.975 -> Stack smashing protect failure!
15:56:36.975 ->
15:56:36.975 -> abort() was called at PC 0x40160d7b on core 1
15:56:36.975 ->
15:56:36.975 -> ELF file SHA256: 00000000000000000000
15:56:36.975 ->
15:56:36.975 -> Backtrace: 0x4008ec74:0x3ffc7f80 0x4008eef1:0x3ffc7fa0 0x40160d7b:0x3ffc7fc0 0x400d5312:0x3ffc7fe0 0x400d533a:0x3ffc80a0 0x400d196d:0xe98646d6
15:56:36.975 ->
15:56:36.975 -> Rebooting...
15:56:37.022 -> ets Jun 8 2016 00:22:57
15:56:37.022 ->
15:56:37.022 -> rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
15:56:37.022 -> configsip: 0, SPIWP:0xee
15:56:37.022 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
15:56:37.022 -> mode:DIO, clock div:1
15:56:37.022 -> load:0x3fff0018,len:4
15:56:37.022 -> load:0x3fff001c,len:1216
15:56:37.022 -> ho 0 tail 12 room 4
15:56:37.022 -> load:0x40078000,len:10944
15:56:37.022 -> load:0x40080400,len:6388
15:56:37.022 -> entry 0x400806b4
15:56:37.396 -> Starting Arduino BLE Client application...

As you can see the board restarts, although the sensor is still connected (the sensor has a led indicator which tells me the connection status, and it is still connected after what is obtained in the serial monitor). I would like to know if someone can help me with my error.
I want to clarify that a few months ago I was getting data with the same code I am using, I did not get the reboot of the card, and I have already tried with different ones.

The code I am using is the following:

`
/**
* A BLE client example that is rich in capabilities.
* There is a lot new capabilities implemented.
* author unknown
* updated by chegewara
*/

#include "BLEDevice.h"
//#include "BLEScan.h"

// Servicios y caracteristicas del sensor XSENS DOT, con UUID en formato
// hexadecimal
// 1517xxxx-4947-11E9-8646-D663BD873D93
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
// The remote service we wish to connect to.
// 0x2000
// Servicio de medición, permite iniciar y detener la medición del sensor, 
// configurar modos de carga y recibir datos de la medición.
static BLEUUID serviceUUID("15172000-4947-11E9-8646-D663BD873D93");
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
// The characteristic of the remote service we are interested in.
// Devuelve los datos de los modos de carga útil, con longitud 
// entre 0 y 20 bits. 0x2004
static BLEUUID short_payload_charUUID("15172004-4947-11E9-8646-D663BD873D93");
// Controla el modo de start/stop y carga de la medición. 0x2001
static BLEUUID       control_charUUID("15172001-4947-11E9-8646-D663BD873D93");
//-----------------------------------------------------------------------

static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* control_pRemoteCharacteristic;
static BLERemoteCharacteristic* short_payload_pRemoteCharacteristic;
static BLEAdvertisedDevice* myDevice;

const uint8_t startmeasure[] = {0x01, 0x01, 0x05};

static void notifyCallback(BLERemoteCharacteristic* pBLERemoteCharacteristic, uint8_t* pData, size_t length, bool isNotify) {
    Serial.print("Notify callback for characteristic ");
    Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
    Serial.print(" of data length ");
    Serial.println(length);
    Serial.print("data: ");
    Serial.println((char*)pData);
}

class MyClientCallback : public BLEClientCallbacks {
  void onConnect(BLEClient* pclient) {
  }

  void onDisconnect(BLEClient* pclient) {
    connected = false;
    Serial.println("onDisconnect");
  }
};

bool connectToServer() {
    Serial.print("Forming a connection to ");
    Serial.println(myDevice->getAddress().toString().c_str());
    
    BLEClient*  pClient  = BLEDevice::createClient();
    Serial.println(" - Created client");

    pClient->setClientCallbacks(new MyClientCallback());

    // Connect to the remove BLE Server.
    pClient->connect(myDevice);  // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
    Serial.println(" - Connected to server");

    // Obtain a reference to the service we are after in the remote BLE server.
    BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(serviceUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our service");

    // Obtain a reference to the characteristic in the service of the remote BLE server.
    //-----------------------------------------------------------------------
    //-----------------------------------------------------------------------
    // Controla el modo de start/stop y carga de la medición. 0x2001
    // 15172001-4947-11E9-8646-D663BD873D93
    control_pRemoteCharacteristic = pRemoteService->getCharacteristic(control_charUUID);
    if (control_pRemoteCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(control_charUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our characteristic Control");
    
    //-----------------------------------------------------------------------
    //-----------------------------------------------------------------------
    // Devuelve los datos de los modos de carga útil, con longitud 
    // entre 0 y 20 bits. 0x2004
    short_payload_pRemoteCharacteristic = pRemoteService->getCharacteristic(short_payload_charUUID);
    if (short_payload_pRemoteCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(short_payload_charUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our characteristic Short payload length");

    //Read the notify of the characteristic.
    if(short_payload_pRemoteCharacteristic->canNotify()) {
      short_payload_pRemoteCharacteristic->registerForNotify(notifyCallback);
      Serial.print("Registered notification was: ");
    }
    
    // Read the value of the characteristic.
    /*
    if(pRemoteCharacteristic->canRead()) {
      std::string value = pRemoteCharacteristic->readValue();
      Serial.print("The characteristic value was: ");
      Serial.println(value.c_str());
      Parse(value.c_str());
    }
    
    if(pRemoteCharacteristic->canNotify())
      pRemoteCharacteristic->registerForNotify(notifyCallback);
      */

    connected = true;
    return true;
}

//Convert String to Decimal
void Parse(const char * Valor) //Decimal
{
  //char input = Valor;
  int x;
  char *endptr;

  x = strtol(Valor, &endptr, 16);

  Serial.println("NULL");
  Serial.println(x, HEX);
  Serial.println(x, DEC);
}


/**
 * Scan for BLE servers and find the first one that advertises the service we are looking for.
 */
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
 /**
   * Called for each advertising BLE server.
   */
  void onResult(BLEAdvertisedDevice advertisedDevice) {

    if(advertisedDevice.getAddress().toString() == "d4:22:cd:00:45:8b") {
      Serial.print("BLE Advertised Device found: ");
      Serial.println(advertisedDevice.toString().c_str());
      Serial.println(advertisedDevice.haveServiceUUID());
      // We have found a device, let us now see if it contains the service we are looking for.
      //if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(serviceUUID)) {
        BLEDevice::getScan()->stop();
        myDevice = new BLEAdvertisedDevice(advertisedDevice);
        doConnect = true;
        doScan = true;
      //} // Found our server
    } //Pregunta de dirección MAC
  } // onResult
}; // MyAdvertisedDeviceCallbacks


void setup() {
  Serial.begin(115200);
  Serial.println("Starting Arduino BLE Client application...");
  BLEDevice::init("");

  //pServerAddress = new BLEAddress("d4:22:cd:00:45:8b");
  //BLEAddress mac = new BLEAddress("");


  // Retrieve a Scanner and set the callback we want to use to be informed when we
  // have detected a new device.  Specify that we want active scanning and start the
  // scan to run for 5 seconds.
  BLEScan* pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setInterval(1349);
  pBLEScan->setWindow(449);
  pBLEScan->setActiveScan(true);
  pBLEScan->start(5, false);
} // End of setup.


// This is the Arduino main loop function.
void loop() {

  // If the flag "doConnect" is true then we have scanned for and found the desired
  // BLE Server with which we wish to connect.  Now we connect to it.  Once we are 
  // connected we set the connected flag to be true.
  if (doConnect == true) {
    if (connectToServer()) {
      Serial.println("We are now connected to the BLE Server.");
    } else {
      Serial.println("We have failed to connect to the server; there is nothin more we will do.");
    }
    doConnect = false;
  }

  // If we are connected to a peer BLE Server, update the characteristic each time we are reached
  // with the current time since boot.
  if (connected) {
    Serial.println("Connected");
    /*
    String newValue = "Time since boot: " + String(millis()/1000);
    Serial.println("Setting new characteristic value to \"" + newValue + "\"");
    
    // Set the characteristic's value to be the array of bytes that is actually a string.
    control_pRemoteCharacteristic->writeValue(newValue.c_str(), newValue.length());
    */
  }else if(doScan){
    BLEDevice::getScan()->start(0);  // this is just eample to start scan after disconnect, most likely there is better way to do it in arduino
  }
  
  delay(1000); // Delay a second between loops.
} // End of loop

`