fix controller not returning to idle on network death

controller/src/main.rs

@@ -231,6 +231,7 @@ async fn main(spawner: Spawner) {
             let mut len: [u8; 4] = [0;4];
             if let Err(e) = socket.read_exact(&mut len).await {
                 warn!("read err: {e:?}");
+                break;
             }
             let len = u32::from_be_bytes(len) as usize;
             let data = &mut buf[0..len];