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diff --git a/arduino/libraries/Bluefruit52Lib/examples/Peripheral/adv_advanced/adv_advanced.ino b/arduino/libraries/Bluefruit52Lib/examples/Peripheral/adv_advanced/adv_advanced.ino
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+++ b/arduino/libraries/Bluefruit52Lib/examples/Peripheral/adv_advanced/adv_advanced.ino
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+/*********************************************************************
+ This is an example for our nRF52 based Bluefruit LE modules
+
+ Pick one up today in the adafruit shop!
+
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+/* This sketches demontrates the Bluefruit.Advertising API(). When powered up,
+ * the Bluefruit module will start advertising for ADV_TIMEOUT seconds (by
+ * default 30 seconds in fast mode, the remaining time slow mode) and then
+ * stop advertising completely. The module will start advertising again if
+ * PIN_ADV is grounded.
+ */
+#include <bluefruit.h>
+
+#define PIN_ADV       A0
+#define ADV_TIMEOUT   60 // seconds
+
+void setup() 
+{
+  // configure PIN_ADV as input with a pullup (pin is active low)
+  pinMode(PIN_ADV, INPUT_PULLUP);
+  
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);   // for nrf52840 with native usb
+
+  Serial.println("Bluefruit52 Advanced Advertising Example");
+  Serial.println("----------------------------------------\n");
+
+  Bluefruit.begin();
+  // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
+  Bluefruit.setTxPower(4);
+  Bluefruit.setName("Bluefruit52");
+
+  // Set up and start advertising
+  startAdv();
+
+  Serial.println("Advertising is started"); 
+}
+
+void startAdv(void)
+{   
+  // Advertising packet
+  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
+  Bluefruit.Advertising.addTxPower();
+  Bluefruit.Advertising.addName();
+
+  /* Start Advertising
+   * - Enable auto advertising if disconnected
+   * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+   * - Timeout for fast mode is 30 seconds
+   * - Start(timeout) with timeout = 0 will advertise forever (until connected)
+   * 
+   * For recommended advertising interval
+   * https://developer.apple.com/library/content/qa/qa1931/_index.html
+   */
+  Bluefruit.Advertising.setStopCallback(adv_stop_callback);
+  Bluefruit.Advertising.restartOnDisconnect(true);
+  Bluefruit.Advertising.setInterval(32, 244);    // in units of 0.625 ms
+  Bluefruit.Advertising.setFastTimeout(30);      // number of seconds in fast mode
+  Bluefruit.Advertising.start(ADV_TIMEOUT);      // Stop advertising entirely after ADV_TIMEOUT seconds 
+}
+
+void loop() 
+{
+  // Only check pin when advertising has already stopped
+  if ( !Bluefruit.Advertising.isRunning() )
+  {
+    // Check if Pin is grounded
+    if ( digitalRead(PIN_ADV) == 0 )
+    {
+      Bluefruit.Advertising.start(ADV_TIMEOUT);
+      Serial.println("Advertising is started");
+    }
+  }
+}
+
+/**
+ * Callback invoked when advertising is stopped by timeout
+ */
+void adv_stop_callback(void)
+{
+  Serial.println("Advertising time passed, advertising will now stop.");
+}