hotfix for mac-detection and various variable names (#139)

* Change Client-Name: The client name inside LVA is not capable of having spaces in the name. Fixed the example.
* Add first version of Docker-Compose for developers
* Add variable for network-interface and auto detection by default
* Added autodetection for the MAC-Address based on the detected or specified network-interface.
* Switched from listening on all IP-Addresses to the IP of the default interface, usually u set the correct network-interface and it will automatically detect the right IP-Address.
* Added missing variables, fixed variables names
* Fixed not working variables for example sound-files.
* Moved the auto-name creation from shell to python. The name is no longer mandatory, it will be generated if no name is given.

linux_voice_assistant/util.py

@@ -1,16 +1,44 @@
 """Utility methods."""
 
 import uuid
+# netifaces lib is from netifaces2
+import netifaces
 from collections.abc import Callable
 from typing import Optional
 
-
-def get_mac() -> str:
-    mac = uuid.getnode()
-    mac_str = ":".join(f"{(mac >> i) & 0xff:02x}" for i in range(40, -1, -8))
-    return mac_str
-
-
 def call_all(*callables: Optional[Callable[[], None]]) -> None:
     for item in filter(None, callables):
         item()
+
+
+def get_default_interface():
+    """Return the default network interface name, or None if not found."""
+    default_gateway = netifaces.default_gateway()
+
+    if not default_gateway:
+        print("No default gateway found")
+        return None
+
+    # default_gateway is e.g. {InterfaceType.AF_INET: ('192.168.33.1', 'wlp0s20f3')}
+    gateway_info = default_gateway.get(netifaces.AF_INET)
+    if not gateway_info:
+        print("No default IPv4 gateway found")
+        return None
+
+    # gateway_info is a tuple: (gateway_ip, interface_name)
+    interface_name = gateway_info[1]
+    #print(f"Default interface: {interface_name}")
+    return interface_name
+
+
+def get_default_ipv4(interface: str):
+    if not interface:
+        return None
+
+    addresses = netifaces.ifaddresses(interface)
+    ipv4_info = addresses.get(netifaces.AF_INET)
+
+    if not ipv4_info:
+        return None
+
+    return ipv4_info[0]["addr"]