File content as of revision 5:8ccb1cd6694d:

#include <mbed.h>
#include <nRF51822n.h>
#define DEBUG 1

#ifdef DEBUG
    Serial pc(USBTX, USBRX);
    #define LOG(args...)    pc.printf(args)
#else
    #define LOG(args...)
#endif

/*
 * The Beacon payload (encapsulated within the MSD advertising data structure)
 * has the following composition:
 * 128-Bit UUID = E2 0A 39 F4 73 F5 4B C4 A1 2F 17 D1 AD 07 A9 61
 * Major/Minor  = 0000 / 0000
 * Tx Power     = C8
 */
const static uint8_t beaconPayload[] = {
    0x4C, 0x00, // Company identifier code (0x004C == Apple)
    0x02,       // ID
    0x15,       // length of the remaining payload
    0xE2, 0x0A, 0x39, 0xF4, 0x73, 0xF5, 0x4B, 0xC4, // UUID
    0xA1, 0x2F, 0x17, 0xD1, 0xAD, 0x07, 0xA9, 0x61,
    0x00, 0x00, // the major value to differenciate a location
    0x00, 0x00, // the minor value to differenciate a location
    0xC8        // 2's complement of the Tx power (-56dB)
};

nRF51822n nrf;
DigitalOut led1(LED1);
DigitalOut advertisingStateLed(LED2);

GapAdvertisingData advData;
GapAdvertisingData scanResponse;
GapAdvertisingParams advParams(GapAdvertisingParams::ADV_NON_CONNECTABLE_UNDIRECTED);

int main(void) {

    nrf.init();
    nrf.reset();

    advData.addFlags(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    advData.addData(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA,
                    beaconPayload, sizeof(beaconPayload));
    advData.addAppearance(GapAdvertisingData::UNKNOWN);
    nrf.getGap().setAdvertisingData(advData, scanResponse);

    nrf.getGap().startAdvertising(advParams);

    for(;;) {
        led1 = !led1;
        wait(1);
    }
}