"Add test files for P110 and Tapo Direct integration in backend"

backend/app/utils/printer_monitor.py

@@ -341,37 +341,42 @@ class PrinterMonitor:
     
     def _ping_address(self, ip_address: str, timeout: int = 3) -> bool:
         """
-        Führt einen Ping-Test zu einer IP-Adresse durch.
+        Führt einen Konnektivitätstest zu einer IP-Adresse durch.
+        Verwendet TCP-Verbindung statt Ping, um Encoding-Probleme zu vermeiden.
         
         Args:
             ip_address: Zu testende IP-Adresse
             timeout: Timeout in Sekunden
             
         Returns:
-            bool: True wenn Ping erfolgreich
+            bool: True wenn Verbindung erfolgreich
         """
         try:
             # IP-Adresse validieren
             ipaddress.ip_address(ip_address.strip())
             
-            # Platform-spezifische Ping-Befehle
-            if os.name == 'nt':  # Windows
-                cmd = ['ping', '-n', '1', '-w', str(timeout * 1000), ip_address.strip()]
-            else:  # Unix/Linux/macOS
-                cmd = ['ping', '-c', '1', '-W', str(timeout), ip_address.strip()]
+            # TCP-Verbindung zu Port 80 (HTTP) oder 443 (HTTPS) versuchen
+            import socket
             
-            result = subprocess.run(
-                cmd,
-                capture_output=True,
-                text=True,
-                encoding='utf-8',
-                errors='ignore',
-                timeout=timeout + 1
-            )
+            # Erst Port 80 versuchen (HTTP)
+            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            sock.settimeout(timeout)
+            result = sock.connect_ex((ip_address.strip(), 80))
+            sock.close()
             
-            return result.returncode == 0
+            if result == 0:
+                return True
+                
+            # Falls Port 80 nicht erfolgreich, Port 443 versuchen (HTTPS)
+            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            sock.settimeout(timeout)
+            result = sock.connect_ex((ip_address.strip(), 443))
+            sock.close()
             
-        except Exception:
+            return result == 0
+            
+        except Exception as e:
+            monitor_logger.debug(f"❌ Fehler beim Verbindungstest zu {ip_address}: {str(e)}")
             return False
     
     def _check_outlet_status(self, ip_address: str, username: str, password: str, timeout: int = 5) -> Tuple[bool, str]: