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Goal: push a value from the device and watch a Gauge update live.

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1. Add a Gauge to a dashboard

In the Dashboard Designer, drop a Gauge onto the canvas. In its General tab, set the widget ID to tempGauge.

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2. Push to that widget ID

The link between firmware and a widget is the widget ID. Push a value to it: 
void loop() {
  device.loop();

  float temperature = readTemperature();        // your sensor
  device.updateWidget(targetId, "tempGauge", temperature);

  delay(2000);
}
targetId is where the value is routed (your dashboard/user). The Gauge bound to tempGauge now reads the value — no polling, no refresh.

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3. Watch it update

Open the dashboard in Preview. As the device sends values, the Gauge moves in real time.
updateWidget has typed overloads — float, String, and vectors of float/int/String — so you can push a single value or a series. See the API reference.

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How it works

This is the up half of the core loop: firmware → updateWidget(targetId, widgetId, value) → the bound widget. Next, the down half: a command from the dashboard to the device.

Next: control hardware

Receive a command and drive a GPIO.