update

main.py

 import tkinter as tk
 from opcua_transmitter import transmitter_main
-#from opcua_receiver import receive_main
+from opcua_receiver import receive_main
 
 class App(tk.Frame):
     def __init__(self, master=None):
@@ -125,11 +125,14 @@ class App(tk.Frame):
             send_to_ip = self.server_udp_ip_entry.get()
             send_to_port = int(self.server_udp_port_entry.get())
             status = transmitter_main(hash_server_ip,hash_server_port,send_to_ip,send_to_port,url,namespace)
-        # else:
-        #     status = receive_main(_Endpoint_Url,_Namespace_Server,_udp_hash_receiver_ip,_udp_hash_receiver_port,_localIP,_localPort)
-
-        # Clear the entry widget
-        self.url_entry.delete(0, tk.END)
+        else:
+            Endpoint_Url = self.url_entry.get()
+            Namespace_Server = self.namespace_entry.get()
+            udp_hash_receiver_ip = self.udp_hash_receiver_ip_entry.get()
+            udp_hash_receiver_port = self.udp_hash_receiver_port_entry.get()
+            localIP = self.udp_ip_entry.get()
+            localPort = self.udp_port_entry.get()
+            status = receive_main(Endpoint_Url,Namespace_Server,udp_hash_receiver_ip,udp_hash_receiver_port,localIP,localPort)
 
     def back_of_send(self):
         # Remove existing widgets

opcua_receiver.py

@@ -14,13 +14,6 @@ udp_hash_receiver_port=data["configuration"]["udp_hash_receiver_port"]
 localIP = data["configuration"]["udp_ip"]
 localPort = data["configuration"]["udp_port"]
 
-bufferSize = 1024
-UDPServerSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
-UDPServerSocket.bind((localIP, localPort))
-
-
-t1=threading.Thread(target=st,args=(Endpoint_Url,Namespace_Server,udp_hash_receiver_ip,udp_hash_receiver_port,))
-t1.start()
 
 opua=None
 sock=None
@@ -36,6 +29,12 @@ def start_server():
 
 def receive_packets():
     print("wait until server starts ...")
+    t1 = threading.Thread(target=st,
+                          args=(Endpoint_Url, Namespace_Server, udp_hash_receiver_ip, udp_hash_receiver_port,))
+    t1.start()
+    bufferSize = 1024
+    UDPServerSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
+    UDPServerSocket.bind((localIP, localPort))
     opua,sock=start_server()
     print("receiving packets ...")
     while (True):