"""Utilities for RPC devices."""

from __future__ import annotations

# The Bluetooth MAC address is the primary MAC address plus 2.
# https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/misc_system_api.html#mac-address


def bluetooth_mac_from_primary_mac(primary_mac: str) -> str:
    """Get Bluetooth MAC from primary MAC.

    MAC address must be in format "[0-F]{16}"

    :param primary_mac: Primary MAC address
    :return: Bluetooth MAC address
    """
    return f"{(int(primary_mac, 16) + 2):012X}"