Update LinkPlayBridge to add mac property (#73)

Author: MahrWe

src/linkplay/bridge.py

@@ -69,6 +69,16 @@ def playmode_support(self) -> list[PlayingMode]:
         playing_modes.insert(0, PlayingMode.NETWORK)  # always supported
         return playing_modes
 
+    @property
+    def mac(self) -> str | None:
+        """Returns the mac address."""
+        mac = self.properties.get(DeviceAttribute.ETH_MAC)
+        if mac == "00:00:00:00:00:00" or mac is None:
+            mac = self.properties.get(DeviceAttribute.STA_MAC)
+        if mac == "00:00:00:00:00:00" or mac is None:
+            mac = self.properties.get(DeviceAttribute.MAC)
+        return mac
+
     @property
     def eth(self) -> str | None:
         """Returns the ethernet address."""