Update examples to use dynamic host IP instead of hardcoded localhost

examples/advanced/network_discover.py

@@ -17,9 +17,22 @@ try:
         get_wildcard_address,
     )
 except ImportError:
-    # Fallbacks if utilities are missing
+    # Fallbacks if utilities are missing - use minimal network discovery
+    import socket
     def get_available_interfaces(port: int, protocol: str = "tcp"):
-        return [Multiaddr(f"/ip4/127.0.0.1/{protocol}/{port}")]
+        # Try to get local network interfaces, fallback to loopback
+        addrs = []
+        try:
+            # Get hostname IP (better than hardcoded localhost)
+            hostname = socket.gethostname()
+            local_ip = socket.gethostbyname(hostname)
+            if local_ip != "127.0.0.1":
+                addrs.append(Multiaddr(f"/ip4/{local_ip}/{protocol}/{port}"))
+        except exception:
+            pass
+        # Always include loopback as fallback
+        addrs.append(Multiaddr(f"/ip4/127.0.0.1/{protocol}/{port}"))
+        return addrs
 
     def expand_wildcard_address(addr: Multiaddr, port: int | None = None):
         if port is None:
@@ -28,6 +41,12 @@ except ImportError:
         return [Multiaddr(addr_str + f"/{port}")]
 
     def get_optimal_binding_address(port: int, protocol: str = "tcp"):
+        # Try to get a non-loopback address first
+        interfaces = get_available_interfaces(port, protocol)
+        for addr in interfaces:
+            if "127.0.0.1" not in str(addr):
+                return addr
+        # Fallback to loopback if no other interfaces found
         return Multiaddr(f"/ip4/127.0.0.1/{protocol}/{port}")
 
     def get_wildcard_address(port: int, protocol: str = "tcp"):