File content as of revision 0:51c847e94a29:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2015 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "mbed.h"
#include "ble/BLE.h"
#include "ble/DiscoveredCharacteristic.h"
#include "ble/DiscoveredService.h"
BLE        ble;
DigitalOut led1(LED1);
Serial pc(USBTX, USBRX);


void periodicCallback(void)
{
    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
}

void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
   
    pc.printf("Adv peerAddr: [%02x %02x %02x %02x %02x %02x] rssi %d, ScanResp: %u, AdvType: %u\r\n",
           params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2], params->peerAddr[1], params->peerAddr[0],
           params->rssi, params->isScanResponse, params->type);

    
        pc.printf("%s", params->advertisingData);
    
    pc.printf("\r\n");

}

void serviceDiscoveryCallback(const DiscoveredService *service) {
    if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
        pc.printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
    } else {
        printf("S UUID-");
        const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
        for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
            printf("%02x", longUUIDBytes[i]);
        }
        pc.printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
    }
}
 
void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
 
}
 
void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
    pc.printf("terminated SD for handle %u\r\n", connectionHandle);
}
 
void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
    pc.printf("Connected!!\r\n");
    ble.stopAdvertising();
    wait(1);
    if (params->role == Gap::CENTRAL) {
        ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
        ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0xa000, 0xa001);
    }
    ble.gap().disconnect(0,Gap::REMOTE_USER_TERMINATED_CONNECTION);
}
void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
{
    pc.printf("Disconnected\r\n");
    pc.printf("Rescan\r\n");
    ble.startScan(advertisementCallback);
    ble.startAdvertising();
}
    

int main(void)
{
    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1);
    ble.onConnection(connectionCallback);
    ble.onDisconnection(disconnectionCallback);

    ble.init();
    
    pc.baud(9600);
    pc.printf("Observer Init \r\n");


    /* */
     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
     ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME,
                                    (const uint8_t *)"DDUDDU", sizeof("DDUDDU") - 1);
   
    ble.gap().setAdvertisingInterval(100); /* 1second. */
    ble.gap().startAdvertising();

    ble.gap().setScanParams(500 /* scan interval */, 200 /* scan window */);
    ble.gap().startScan(advertisementCallback);
    
    while (true) {
        ble.waitForEvent();
    }
}