Update util.py

Revert MAC address detection logic.

linux_voice_assistant/util.py

@@ -3,7 +3,6 @@
 import logging
 import uuid
 from collections.abc import Callable
-from pathlib import Path
 from typing import Optional
 
 _LOGGER = logging.getLogger(__name__)
@@ -14,62 +13,31 @@ def get_mac_address() -> str:
     """
     Get the MAC address as a hex string (lowercase, no colons).
     Example: "b827eb123456"
-    
+
-    This method prioritizes physical Linux interfaces to ensure stability 
+    This is a thin wrapper around uuid.getnode(), cached so we only
-    across reboots, avoiding uuid.getnode()'s random fallback.
+    compute/log it once per process.
     """
     global _CACHED_MAC
     if _CACHED_MAC:
         return _CACHED_MAC
 
-    # 1. Try reading from sysfs (Linux specific, most stable)
-    # We look for common interface names first.
-    interfaces = ["wlan0", "eth0", "end0", "enp", "wlp"]
-    sys_net = Path("/sys/class/net")
-    
-    if sys_net.exists():
-        # Sort to prefer 'wlan0' or 'eth0' over others
-        found_devs = sorted([p.name for p in sys_net.iterdir()])
-        
-        # Reorder to prioritize preferred interfaces
-        target_devs = []
-        for pref in interfaces:
-            for dev in found_devs:
-                if dev.startswith(pref):
-                    target_devs.append(dev)
-        
-        # Add any remaining devices (excluding loopback)
-        for dev in found_devs:
-            if dev not in target_devs and dev != "lo":
-                target_devs.append(dev)
-
-        for dev_name in target_devs:
-            try:
-                addr_path = sys_net / dev_name / "address"
-                if addr_path.exists():
-                    mac_str = addr_path.read_text().strip().replace(":", "").lower()
-                    if len(mac_str) == 12:
-                        _LOGGER.debug(f"Found MAC address from {dev_name}: {mac_str}")
-                        _CACHED_MAC = mac_str
-                        return _CACHED_MAC
-            except Exception:
-                continue
-
-    # 2. Fallback to uuid.getnode()
-    _LOGGER.warning("Could not find MAC from sysfs, falling back to uuid.getnode()")
     node = uuid.getnode()
-    
-    # Check if the multicast bit is set (indicates a random MAC)
-    if (node >> 40) & 1:
-        _LOGGER.warning("Generated MAC address is RANDOM/MULTICAST. Discovery identity will change on reboot.")
-
     mac_hex = f"{node:012x}"
+
+    # If the multicast bit is set, this is probably not a real hardware MAC.
+    if (node >> 40) & 1:
+        _LOGGER.warning(
+            "uuid.getnode() returned a MAC with the multicast bit set; "
+            "discovery identity may change on reboot."
+        )
+
+    _LOGGER.debug("Using MAC address from uuid.getnode(): %s", mac_hex)
     _CACHED_MAC = mac_hex
     return _CACHED_MAC
 
 
 def format_mac(mac: str) -> str:
-    """Format a hex MAC string with colons (e.g., aa:bb:cc...)."""
+    """Format a hex MAC string with colons (e.g., aa:bb:cc:dd:ee:ff)."""
     return ":".join(mac[i : i + 2] for i in range(0, 12, 2))