How to turn a WaveShare nRF51-BLE400 into a discoverable beacon using mbed

Dependencies:   mbed BLE_API nRF51822

Port for WaveShare BLE400 (chip nRF51 Aliexpress devboard)
Android Evothings good example for Nordic nRF51822-DK

As target for mbed-online used <Nordic nRF51822>
- (Large green board Nordic nRF51822-mKIT, actually deprecated on 01/03/2019)

Briefly: Handle via Evothings BLE Application 4 LEDs and 2 Buttons(via notify messages).

Figure 1: Evothings Android application screenshot

Evothings application screenshot

Android Evothings application sources

Android application APK

Happy coding!
maxxir 02/03/19

Revision:
1:0692bee84264
Parent:
0:5375be4301ed
Child:
3:e9646631084f
--- a/main.cpp	Wed Jan 28 00:30:09 2015 +0000
+++ b/main.cpp	Fri Feb 13 20:59:53 2015 +0000
@@ -1,10 +1,38 @@
+
+// Headers necessary for mbed and BLE device mode
 #include "mbed.h"
 #include "BLEDevice.h"
 
+// BLE object
+BLEDevice ble;
 
-int
-main(void)
+/**
+  You have up to 26 bytes of advertising data to use.
+  Make up your own encoding for these 26bytes, send it across
+  and decode it using the evothings app.
+ */
+const static uint8_t AdvData[] = {"ChangeThisData"};             // example of character data
+//const static uint8_t AdvData[] = {0x01,0x02,0x03,0x04,0x05};   // example of hex data
+
+// main program
+int main(void)
 {
-    printf("This is an example program...");
-    while(1){}
-}
\ No newline at end of file
+    // Initialize BLE baselayer, always do this first!
+    ble.init();
+
+    // Sacrifice 3B of 31B to Advertising Flags
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE );
+
+    // Sacrifice 2B of 31B to AdvType overhead, rest goes to AdvData array you define
+    ble.accumulateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, AdvData, sizeof(AdvData));
+
+    // Set advertising interval. Longer interval = longer battery life
+    ble.setAdvertisingType(GapAdvertisingParams::ADV_NON_CONNECTABLE_UNDIRECTED);
+    ble.setAdvertisingInterval(160); // 100ms; in multiples of 0.625ms.
+    ble.startAdvertising();
+
+    // Infinite loop waiting for BLE events
+    for (;;) {
+        ble.waitForEvent(); // this saves battery
+    }
+}