diff --git a/examples/wsmock.py b/examples/wsmock.py
index ac8794c..bb03310 100644
--- a/examples/wsmock.py
+++ b/examples/wsmock.py
@@ -6,15 +6,22 @@
 import asyncio
 import aiohttp.web
 from datetime import datetime, timezone
+import string
+import random
 
+HOST = "127.0.0.1"
+PORT = 8080
+DEFAULT_PIN = "123456"
 RECEIVE_TIMEOUT = 1
 
 
 class ChargePoint:
-    def __init__(self):
-        self.pin = "123456"
-        self.serial = "1908000575A"
-        self.url = "ws://127.0.0.1:8080/"
+    def __init__(self, serial: str | None = None, pin: str | None = None):
+        self.serial = (
+            serial or "".join(random.choice(string.digits) for _ in range(10)) + "A"
+        )
+        self.pin = pin or DEFAULT_PIN
+        self.url = f"ws://{HOST}:{PORT}/"
         self.connected = False
 
     async def send_status(self, ws) -> None:
@@ -94,7 +101,7 @@ async def websocket_handler(request):
 def main() -> None:
     app = aiohttp.web.Application()
     app.router.add_route("GET", "/", websocket_handler)
-    aiohttp.web.run_app(app, host="127.0.0.1", port=8080)
+    aiohttp.web.run_app(app, host=HOST, port=PORT)
 
 
 if __name__ == "__main__":