add basic BLE example

Author: Wenn0101

libraries/Apollo3/examples/Example11_BLEAdvertise/Example11_BLEAdvertise.ino

@@ -0,0 +1,51 @@
+/*
+  BLEAdvertise
+
+  This example creates a BLE peripheral which advertises itself as Artemis.
+  Central devices may connect with it, but there are no services or 
+  characteristics to interact with.
+
+  Based on a stripped down version of the LED example from the ArduinoBLE examples
+*/
+
+#include <ArduinoBLE.h> //http://librarymanager/All#ArduinoBLE_IoT
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial);
+
+  // begin initialization
+  if (!BLE.begin()) {
+    Serial.println("Starting BLE failed!");
+    while (1);
+  }
+
+  // set advertised local name and service UUID:
+  BLE.setLocalName("Artemis");
+
+  // start advertising
+  BLE.advertise();
+
+  Serial.println("BLE advertising as 'Artemis'");
+}
+
+void loop() {
+  // listen for BLE peripherals to connect:
+  BLEDevice central = BLE.central();
+
+  // if a central is connected to peripheral:
+  if (central) {
+    Serial.print("Connected to central: ");
+    // print the central's MAC address:
+    Serial.println(central.address());
+
+    // while the central is still connected to peripheral...
+    while (central.connected()) {
+      //Nothing to do here
+    }
+
+    // when the central disconnects, print it out:
+    Serial.print(F("Disconnected from central: "));
+    Serial.println(central.address());
+  }
+}