Receiving UDP from ESP32

UdpListener.py

@@ -1,13 +1,19 @@
 import socket
+import struct
 
 def start_server(ip, port):
-    server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-    server_socket.bind((ip, port))
+    server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
+    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)  # Enable port reusage
+    server_socket.bind(('', port))  # Bind to the port, not the multicast IP
     print(f"UDP server listening on {ip}:{port}")
+    
+    # Join the multicast group
+    mreq = struct.pack("4sl", socket.inet_aton(ip), socket.INADDR_ANY)
+    server_socket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
 
     while True:
         data, addr = server_socket.recvfrom(1024)  # buffer size is 1024 bytes
         print(f"received message: {data} from {addr}")
 
 if __name__ == "__main__":
-    start_server("localhost", 8888)
+    start_server("239.1.2.3", 1234)

UdpMocker.py

@@ -2,8 +2,8 @@ import socket
 import time
 
 # UDP Configuration
-ip = "localhost"  # Change this to the IP address of your computer or the network address to multicast
-port = 8888  # Ensure this matches the port number in your Unity script
+ip = "239.1.2.3"  # Change this to the IP address of your computer or the network address to multicast
+port = 1234  # Ensure this matches the port number in your Unity script
 
 # Create the UDP socket
 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)