#include <stdio.h>
 
void send_array(int one, int two, const char *f, const char *t) {
    (void)one; (void)two; (void)f; // ignore unused variables
    printf("send_array() called with %s\n", t);
}
 
int main(void) {
    int array[] = {0xd3, 0x8a, 0xf0, 0x21, 0x1e, 0x1f, 0xe7, 0xc3, 0xa1, 0xa4, 0x47};
    char buffer[1000]; // large enough
    char *b = buffer + sprintf(buffer, "%02x", array[0]);
    for (unsigned i = 1; i < sizeof array / sizeof *array; i++) {
        b += sprintf(b, " %02x", array[i]);
    }
    send_array(1, 2, "%s\n", buffer);
    return 0;
}
 

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