Our monitoring dashboard for device status is showing significant lag - sometimes 2-3 minutes behind actual device state. We have WebSocket connections configured for real-time push updates, but the dashboard still seems to be polling or receiving delayed events. When I check the event stream directly via API, I can see device status changes happening immediately, but the dashboard doesn’t reflect these changes until much later.
The dashboard refresh rate is set to 5 seconds in the configuration, and the event stream config appears correct with WebSocket push enabled. I’ve verified the WebSocket connection is established (shows as ‘connected’ in browser dev tools), but status updates aren’t being pushed through in real-time. Sometimes the dashboard shows stale data for devices that have been offline for several minutes.
Has anyone experienced issues with WebSocket push updates not working properly for device status monitoring? Is there something specific about the event stream configuration that needs to be set for real-time dashboard updates?
You’re right - I checked the dashboard code and it does have a setInterval(fetchStatus, 5000) call. But we’re using the standard Watson IoT dashboard component, not custom code. Shouldn’t the built-in dashboard automatically use WebSocket push when it’s available? Or do we need to configure something specific to enable push mode instead of polling mode?
The Watson IoT dashboard has two modes: polling mode (default) and streaming mode (WebSocket push). You need to explicitly enable streaming mode in the dashboard configuration. It’s not automatic even if WebSocket is connected. Also check which events you’re subscribed to - device status changes might not be included in your event subscription filter. The dashboard needs to subscribe to ‘device.status.*’ events specifically.
Streaming mode is configured via the dashboard widget properties, not global settings. Each widget can be set to streaming or polling independently. For device status widgets, you need to set ‘dataSource: stream’ and ‘eventFilter: [“device.status.connected”, “device.status.disconnected”]’. The WebSocket connection is shared across all streaming widgets, so you only need one connection for the entire dashboard.
Dashboard refresh rate of 5 seconds suggests it’s still polling, not using true WebSocket push. Even with WebSocket connected, if your dashboard JavaScript is using setInterval for refresh, it won’t get real-time updates. Check your dashboard code to make sure it’s actually listening for WebSocket events, not just maintaining a connection while polling.