used cached values. and poll javascript allow failed polls

csaxs_bec/bec_ipython_client/plugins/flomni/flomni_webpage_generator.py

@@ -158,7 +158,7 @@ def _safe_get(device_manager, dotpath: str):
         obj = device_manager.devices
         for part in dotpath.split("."):
             obj = getattr(obj, part)
-        return obj.get()
+        return obj.get(cached=True)
     except Exception:
         return None
 
@@ -2230,16 +2230,23 @@ function render(d){{
   handleAudioForStatus(s, prevStatus);
 }}
 
+let _fetchFailCount=0;
+const FETCH_FAIL_THRESHOLD=3;
+
 async function poll(){{
   try{{
     const r=await fetch(STATUS_JSON, {{cache:'no-store'}});
     if(!r.ok) throw new Error('HTTP '+r.status);
+    _fetchFailCount=0;
     render(await r.json());
   }}catch(e){{
-    console.warn('Fetch failed:',e);
-    document.getElementById('last-update').textContent='fetch failed - retrying...';
-    document.getElementById('outdated-banner').classList.add('visible');
-    handleStale(true);
+    _fetchFailCount++;
+    console.warn('Fetch failed:',e,'('+_fetchFailCount+')');
+    document.getElementById('last-update').textContent='fetch failed - retrying\u2026 ('+_fetchFailCount+')';
+    if(_fetchFailCount>=FETCH_FAIL_THRESHOLD){{
+      document.getElementById('outdated-banner').classList.add('visible');
+      handleStale(true);
+    }}
   }}
 }}