Question

printf("%d, ", packet[i]);

How to display variable correctly. It should be from 0 to 255
but if I use %d it prints:

-1 as 255

up to the number 128 is displayed correctly, larger are negative.

when I use %u it prints 4294967295 instead of 255.

Answer 1

Use %hhu conversion specification:

printf("%hhu, ", packet[i]);