Is there a way to detect a CAN message loss in a RX Fifo when in the overwrite mode (so an overwrite?)

Hello,I'm on a STM32H743 (nucleo-H743ZI2), and I got LWIP (no OS) to "work", as in it receives ip packets and reads them. The problem is with allocating on the heap. I didn't use the libc_malloc option, the heap pointer is at 0x30044000 and is 1600 b...