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.
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.