Chang publish buffer

[thankzuy]

Hi, i tried to change the publish buffer of my stm32f4 by changing the rbuflen and tbuflen in STM32Hardware.h:
const static uint16_t rbuflen = 4096;
const static uint16_t tbuflen = 4096;
But when I established the connection with my pc, I still got this message:
Note: publish buffer size is 512 bytes
Is there any where else I have to modify in my firmware? Thank you for reading my question.