Simple usage of CW308 (STM32F405xxxx)

Hi everyone,
I’m a new user of the ChipWhisperer board, and would like to work over a target CW308 (STM32F405xxxx).

After I’ve managed to compile a simple program for this target, with SimpleSerial library v1.1., I can’t communicate properly with it, particularly when I sent the simpleserial_wait_ack command.

Does anyone in the community have any tips for findings the right communication parameters in my case ?