feat: add max number of retries for socket binding

iso15118/secc/transport/tcp_server.py

@@ -81,10 +81,14 @@ async def server_factory(self, ready_event: asyncio.Event, tls: bool) -> None:
             port = self.port_tls
             ssl_context = get_ssl_context(True)
             server_type = "TLS"
-        # Initialise socket for IPv6 TCP packets
-        # Address family (determines network layer protocol, here IPv6)
-        # Socket type (stream, determines transport layer protocol TCP)
-        while True:
+
+        MAX_RETRIES: int = 3
+        BACK_OFF_SECONDS: float = 0.5
+
+        for i in range(MAX_RETRIES):
+            # Initialise socket for IPv6 TCP packets
+            # Address family (determines network layer protocol, here IPv6)
+            # Socket type (stream, determines transport layer protocol TCP)
             sock = socket.socket(family=socket.AF_INET6, type=socket.SOCK_STREAM)
 
             # Allows address to be reused
@@ -97,11 +101,16 @@ async def server_factory(self, ready_event: asyncio.Event, tls: bool) -> None:
             # TCP packets
             try:
                 sock.bind(self.full_ipv6_address)
+                break
             except OSError as e:
-                logger.info(f"{e} on {server_type} server. Retrying...")
-                await asyncio.sleep(0.5)
-                continue
-            break
+                # Once the max amount of retries has been reached, reraise the exception
+                if i == MAX_RETRIES - 1:
+                    raise e
+                else:
+                    logger.info(f"{e} on {server_type} server. Retrying...")
+                    await asyncio.sleep(BACK_OFF_SECONDS)
+                    continue
+
         server = await asyncio.start_server(
             # The client_connected_cb callback, which is the __call__ method of
             # this class) is called whenever a new client connection is