I2C slave STM32

Hello,
I have a project we are using a module with a SMT32 microntroller, exactly a radino32 with a STM32L151CC. I need to turn the radino32 as slave on an I2C bus.
I have followed the tutorial from arduino site: https://www.arduino.cc/en/Tutorial/MasterWriter.
My surprise is I can’t turn the radino32 as slave. I have tested with to ardunio unos and it is working, even I have tested with arduino uno and adafruit feather 32u4, and it is working too. I have use two pullup resisitors on SDA and SCL. Same soft and same hard for slave, just changing the arduino is working as slave with the radino32.
Maybe I trying to do something it is not possible...
Has anybody tried turn this kind of MCU as slave on I2C bus??
Any suggestions??
Thank you!
BR,
daniel

Maybe I trying to do something it is not possible...

As far as I know STM32 doesn't support I2C slave mode at least not with the Arduino IDE.