client: clear app state after disconnect

src/app.rs

@@ -29,6 +29,11 @@ impl App {
         tx
     }
 
+    pub fn clear(&self) {
+        let mut state = self.state.write().unwrap();
+        *state = None;
+    }
+
     // TODO: async drop til 1st header
     pub fn subscribe(&self) -> Option<Receiver<Payload>> {
         let state = self.state.read().unwrap();

src/client.rs

@@ -57,6 +57,7 @@ pub async fn run(app: App) {
     loop {
         run_once(&app).await
             .unwrap_or_else(|e| println!("Client: {:?}", e));
+        app.clear();
 
         sleep(Duration::from_secs(1)).await;
     }