Update SliderWidget.ino

Author: shramik49

examples/CustomWidgets/SliderWidget/SliderWidget.ino

@@ -46,4 +46,13 @@ CAYENNE_IN(VIRTUAL_CHANNEL)
 	CAYENNE_LOG("Channel %d, pin %d, value %d", VIRTUAL_CHANNEL, ACTUATOR_PIN, value);
 	// Write the value received to the PWM pin. analogWrite accepts a value from 0 to 255.
 	analogWrite(ACTUATOR_PIN, value);
-}
+}
+
+// This function is called at intervals to send data to Cayenne and keep the device online.
+// Will create a temporary green widget on Channel 0, make it permanent by clicking on '+'. 
+CAYENNE_OUT(0)
+{
+	CAYENNE_LOG("Send data for Virtual Channel 0");
+	// This command writes the device's uptime in seconds to the Virtual Channel. 
+	Cayenne.virtualWrite(0, millis() / 1000);
+}