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arduino-cli/libraries/Blynk/examples/More/Sync/HardwareSyncStateFromApp/HardwareSyncStateFromApp.ino

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+/*************************************************************
+  Download latest Blynk library here:
+    https://github.com/blynkkk/blynk-library/releases/latest
+
+  Blynk is a platform with iOS and Android apps to control
+  Arduino, Raspberry Pi and the likes over the Internet.
+  You can easily build graphic interfaces for all your
+  projects by simply dragging and dropping widgets.
+
+    Downloads, docs, tutorials: http://www.blynk.cc
+    Sketch generator:           http://examples.blynk.cc
+    Blynk community:            http://community.blynk.cc
+    Follow us:                  http://www.fb.com/blynkapp
+                                http://twitter.com/blynk_app
+
+  Blynk library is licensed under MIT license
+  This example code is in public domain.
+
+ *************************************************************
+
+  You can synchronize the state of widgets with hardware states,
+  even if hardware resets or looses connection temporarily
+
+  Project setup in the Blynk app:
+    Slider widget (0...1024) on V0
+    Value display (0...1024) on V2
+    Button widget on digital pin (connected to an LED)
+ *************************************************************/
+
+/* Comment this out to disable prints and save space */
+#define BLYNK_PRINT Serial
+
+
+#include <SPI.h>
+#include <Ethernet.h>
+#include <BlynkSimpleEthernet.h>
+
+// You should get Auth Token in the Blynk App.
+// Go to the Project Settings (nut icon).
+char auth[] = "YourAuthToken";
+
+// This function will run every time Blynk connection is established
+BLYNK_CONNECTED() {
+  // Request Blynk server to re-send latest values for all pins
+  Blynk.syncAll();
+
+  // You can also update individual virtual pins like this:
+  //Blynk.syncVirtual(V0, V2);
+
+  // Let's write your hardware uptime to Virtual Pin 2
+  int value = millis() / 1000;
+  Blynk.virtualWrite(V2, value);
+}
+
+BLYNK_WRITE(V0)
+{
+  // Use of syncAll() will cause this function to be called
+  // Parameter holds last slider value
+  int sliderValue0 = param.asInt();
+}
+
+BLYNK_WRITE(V2)
+{
+  // You'll get uptime value here as result of syncAll()
+  int uptime = param.asInt();
+}
+
+void setup()
+{
+  // Debug console
+  Serial.begin(9600);
+
+  Blynk.begin(auth);
+}
+
+void loop()
+{
+  Blynk.run();
+}
+