Hi Pete, thanks for your advice, i made a lot of progress and found out what causes the issue.
My conclusion is that if i use BlynkSimpleEsp32_SSL.h and BluetoothSerial.h there is a conflict.
Reading those .h files (from https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/src/BluetoothSerial.h, and https://github.com/blynkkk/blynk-library/blob/master/src/BlynkSimpleEsp32_SSL.h) , i found out that both have the sentence o function bool connect(), so i suspect that there is the problem but i do not know how to solve it.
My conclusion is that using those .h in the same code makes conflict, but i understand that i cannot modify those files, so i need hel with that.
Thanks in advance