Add timeout to internal_start_client

src/py/flwr/client/app.py

@@ -237,6 +237,7 @@ class `flwr.client.Client` (default: None)
         root_certificates=root_certificates,
         insecure=insecure,
         transport=transport,
+        timeout=timeout,
     )
     event(EventType.START_CLIENT_LEAVE)
 
@@ -255,6 +256,7 @@ def _start_client_internal(
     root_certificates: Optional[Union[bytes, str]] = None,
     insecure: Optional[bool] = None,
     transport: Optional[str] = None,
+    timeout: int = TRANSPORT_TIMEOUT_DEFAULT,
 ) -> None:
     """Start a Flower client node which connects to a Flower server.
 
@@ -290,6 +292,8 @@ class `flwr.client.Client` (default: None)
         - 'grpc-bidi': gRPC, bidirectional streaming
         - 'grpc-rere': gRPC, request-response (experimental)
         - 'rest': HTTP (experimental)
+    timeout : int (default: 60)
+        A timeout (in seconds) for making requests to the server.
     """
     if insecure is None:
         insecure = root_certificates is None