add UDP command processing and sender for dynamic testing

tools/udp_cmd_sender.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+"""
+UDP Command Sender for Truma ESP32 Master Mode
+Sends diagnostic commands to ESP32 for dynamic testing
+"""
+
+import socket
+import sys
+import time
+
+def send_command(esp_ip, command, nad):
+    """Send a diagnostic command to ESP32"""
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    
+    # Format: "CMD:B2 23 17 46 10 03 NAD:01"
+    message = f"CMD:{command} NAD:{nad:02X}"
+    
+    print(f"Sending: {message}")
+    sock.sendto(message.encode(), (esp_ip, 5556))
+    sock.close()
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage:")
+        print("  python udp_cmd_sender.py <ESP32_IP> [command] [nad]")
+        print("")
+        print("Examples:")
+        print("  python udp_cmd_sender.py 192.168.1.90")
+        print("  python udp_cmd_sender.py 192.168.1.90 'B2 23 17 46 10 03' 01")
+        print("  python udp_cmd_sender.py 192.168.1.90 'B2 00 17 46 10 03' 01")
+        print("  python udp_cmd_sender.py 192.168.1.90 'B2 00 17 46 40 03' 01")
+        print("")
+        print("Interactive mode if no command specified.")
+        return
+    
+    esp_ip = sys.argv[1]
+    
+    if len(sys.argv) >= 4:
+        # Single command mode
+        command = sys.argv[2]
+        nad = int(sys.argv[3], 16)
+        send_command(esp_ip, command, nad)
+    else:
+        # Interactive mode
+        print(f"UDP Command Sender - Connected to ESP32 at {esp_ip}:5556")
+        print("Commands will be sent to ESP32 and you should see responses on UDP port 5555")
+        print("")
+        print("Useful commands to try:")
+        print("  B2 23 17 46 10 03  (Query identifier 0x23 with CP Plus signature)")
+        print("  B2 00 17 46 10 03  (Query identifier 0x00 with CP Plus signature)")  
+        print("  B2 00 17 46 40 03  (Query identifier 0x00 with heater signature)")
+        print("  B2 00 17 46 01 03  (Query identifier 0x00 with old signature)")
+        print("")
+        print("Enter 'quit' to exit")
+        print("")
+        
+        while True:
+            try:
+                user_input = input("Enter command (hex bytes): ").strip()
+                if user_input.lower() in ['quit', 'exit', 'q']:
+                    break
+                
+                if not user_input:
+                    continue
+                
+                # Get NAD
+                nad_input = input("Enter NAD (hex, default 01): ").strip()
+                if not nad_input:
+                    nad = 1
+                else:
+                    nad = int(nad_input, 16)
+                
+                send_command(esp_ip, user_input, nad)
+                print("Command sent! Check UDP receiver for responses.")
+                print("")
+                
+            except KeyboardInterrupt:
+                break
+            except Exception as e:
+                print(f"Error: {e}")
+        
+        print("Goodbye!")
+
+if __name__ == "__main__":
+    main()