websocket: automatically reconnect if not heard from for a while

kordophone/src/tests/test_client.rs

@@ -105,7 +105,7 @@ impl APIInterface for TestClient {
         Ok(message)
     }
 
-    async fn open_event_socket(&mut self) -> Result<impl EventSocket, Self::Error> {
+    async fn open_event_socket(&mut self, _update_seq: Option<u64>) -> Result<impl EventSocket, Self::Error> {
         Ok(TestEventSocket::new())
     }
 }