2.2.0 is out. For dashboards it brings IoT data sources: devices, alarms and telemetry, with live updates.
The list of sources, which of them are live and how the time window works is on Data sources and parameters. Build your first dashboard uses them for a value card and a line chart.
The device and alarm screens, the Commands tab and the device log from the same release have their own post, and so do the SCADA conveyor changes.
Gauge bound to A value of a device (live) reacts instantly. The table of about 40 devices next to it lags by up to 30 seconds. Is that what Polled in the docs’ Live column means?
Yes, if the table reads Latest values of many devices: that source is polled, so the table refreshes on its interval. The live ones include A value of a device, Device readings over time, Devices, Alarms and Alarm counts. A table that pages on the server never updates live either. If 30 seconds is too slow for you, lower Refresh every (seconds) on that card.
My line chart stays empty but the stat card next to it shows the temperature fine. Same device, same key. The device sends this:
{"temperature":"21.4","hum":"55"}What am I missing?
The quotes. "21.4" is stored as text, and only numbers have a chart history, so the stat card shows the latest value and the chart has nothing to draw. Send {"temperature":21.4,"hum":55}. Details on Numbers, text and true/false values.
fixed in the sketch (was using String() on everything), chart is filling up now. the old points stay missing but I can live with that
How many devices can one table show? We have around 700 meters under one profile.
At most 500 rows per source; past that the table says how many it is showing. With 700 under one profile I’d add a parameter or a key filter so a table covers one group of meters at a time.
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