def pair_hexvalue(value, delimiter=":"):
    """
    Pair hex values (string) using delimiter.
    e.g. abcdef -> ab:cd:ef

    :param value:
    :param delimiter:
    :return:
    """
    return delimiter.join(
        ["{}{}".format(a, b) for a, b in zip(value[::2], value[1::2])]
    )