How to Switch between Wifi and BLE on a Arduino nano IoT?

In the meantime I've found an answer to the memory leak problem on the ArduinoBLE library:

It looks like the issue comes from the following file:

.\libraries\ArduinoBLE\src\utility\GATT.cpp

In void GATTClass::begin() a some objects are created with new. However they are not deleted in void GATTClass::end().

So the method need to be updated as follows:

void GATTClass::end()
{
  delete( _genericAccessService );
  delete( _deviceNameCharacteristic );
  delete( _appearanceCharacteristic );
  delete( _genericAttributeService );
  delete( _servicesChangedCharacteristic );
 _attributes.clear();
}

There's an open issue on GitHub https://github.com/arduino-libraries/ArduinoBLE/issues/192

Now back to the part of switch between BLE and WiFI. This is how to do it:

//Start Wifi
  wiFiDrv.wifiDriverDeinit();
  wiFiDrv.wifiDriverInit();
  status = WiFi.begin(ssid, pass);
  server.begin();

//...

// End Wifi    

  WiFi.end()     

//...

//Start BLE
    BLE.begin();
    BLE.scan(); 

//...

// End BLE
   BLE.stopAdvertise();   //don't think this is needed as I am reading other BLE devices
   BLE.stopScan();
   BLE.end();

BLEservice and BLEcharacteristics are done on the setup() part of the code.