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libraries/Blynk/examples/More/SetProperty/SetProperty_MultiValue/SetProperty_MultiValue.ino

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+/*************************************************************
+  Blynk is a platform with iOS and Android apps to control
+  ESP32, Arduino, Raspberry Pi and the likes over the Internet.
+  You can easily build mobile and web interfaces for any
+  projects by simply dragging and dropping widgets.
+
+    Downloads, docs, tutorials: https://www.blynk.io
+    Sketch generator:           https://examples.blynk.cc
+    Blynk community:            https://community.blynk.cc
+    Follow us:                  https://www.fb.com/blynkapp
+                                https://twitter.com/blynk_app
+
+  Blynk library is licensed under MIT license
+  This example code is in public domain.
+
+ *************************************************************
+
+  You can set predefined properties (color, label, ...) of any widget.
+  Read more: https://docs.blynk.io/en/blynk.edgent-firmware-api/widget-properties
+
+  Datastream setup:
+    Virtual Pin V1, type: Integer, min: 1, max: 3
+
+  App dashboard setup:
+    Menu Widget on V1 with 2 items: "Item 1", "Add items"
+ *************************************************************/
+
+/* Comment this out to disable prints and save space */
+#define BLYNK_PRINT Serial
+
+/* Fill in information from Blynk Device Info here */
+//#define BLYNK_TEMPLATE_ID           "TMPxxxxxx"
+//#define BLYNK_TEMPLATE_NAME         "Device"
+//#define BLYNK_AUTH_TOKEN            "YourAuthToken"
+
+
+#include <SPI.h>
+#include <Ethernet.h>
+#include <BlynkSimpleEthernet.h>
+
+BLYNK_WRITE(V1) {
+  int value = param.asInt();
+  if (value == 1) {
+    Serial.println("Item 1 selected");
+  } else if (value == 2) {
+    // If item 2 is selected, change menu items...
+    BlynkParamAllocated items(128); // list length, in bytes
+    items.add("New item 1");
+    items.add("New item 2");
+    items.add("New item 3");
+    Blynk.setProperty(V1, "labels", items);
+
+    // You can also use it like this:
+    //Blynk.setProperty(V1, "labels", "item 1", "item 2", "item 3");
+
+  } else {
+    Serial.println("Unknown item selected");
+  }
+}
+
+void setup()
+{
+  // Debug console
+  Serial.begin(9600);
+
+  Blynk.begin(BLYNK_AUTH_TOKEN);
+}
+
+void loop()
+{
+  Blynk.run();
+}
+