add a hole punch test server

extras/hole-punch-test-server.py

@@ -0,0 +1,16 @@
+import socket
+
+SERVER_PORT = 41234
+SERVER_SEND_PORT = 41235
+
+sock_recv = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock_recv.bind(("0.0.0.0", SERVER_PORT))
+sock_send = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock_send.bind(("0.0.0.0", SERVER_SEND_PORT))
+
+print("Running...")
+
+while True:
+    data, addr = sock_recv.recvfrom(1024)
+    print(f"Recieved test from addr {addr}")
+    sock_send.sendto(data, addr)

main.py

@@ -15,6 +15,8 @@ import ipaddress
 import pyperclip
 import requests
 
+HOLE_PUNCH_TEST = ("0.0.0.0", 41234)
+
 
 class SetupApp(App):
     DEFAULT_CSS = """
@@ -446,12 +448,35 @@ class SettingsScreen(Screen):
                         id="instructions",
                     )
                     yield Button("Add Contact", id="add-contact")
+                with TabPane("Extras"):
+                    yield Label(
+                        "This button will run a test to see if this application will work correctly."
+                    )
+                    yield Button("Test hole punching", id="test-hole")
+
+    def test_hole_punch(self):
+        test_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        test_sock.bind((my_ip, 0))
+        test_sock.settimeout(5)
+
+        test_sock.sendto(b"TEST", HOLE_PUNCH_TEST)
+
+        try:
+            data, addr = test_sock.recvfrom(1024)
+        except socket.timeout:
+            self.app.call_from_thread(self.notify, "Test failed", severity="error")
+        else:
+            self.app.call_from_thread(self.notify, "Test worked!")
+        test_sock.close()
 
     def on_button_pressed(self, event):
         if event.button.id == "close-btn":
             self.dismiss()
         elif event.button.id == "add-contact":
             self.app.push_screen(ChoiceScreen(), self.on_screen_done)
+        elif event.button.id == "test-hole":
+            self.notify("Test started....", severity="information")
+            threading.Thread(target=self.test_hole_punch).start()
         elif event.button.id == "profile-confirm":
             valid_ip = True
             valid_port = True