#include "relay_types.h"
#include <stdio.h>
#include <string.h>

int relay_hex_to_bytes(const char *hex, size_t hex_len, uint8_t *out, size_t out_len)
{
    if (hex_len != out_len * 2) return -1;
    for (size_t i = 0; i < out_len; i++) {
        unsigned int byte;
        if (sscanf(hex + i * 2, "%02x", &byte) != 1) return -1;
        out[i] = (uint8_t)byte;
    }
    return 0;
}

void relay_bytes_to_hex(const uint8_t *bytes, size_t len, char *hex)
{
    for (size_t i = 0; i < len; i++)
        sprintf(hex + i * 2, "%02x", bytes[i]);
    hex[len * 2] = '\0';
}