File content as of revision 72:99c283dfe28d:

/* 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/services/HeartRateService.h"
#include "ble/services/BatteryService.h"
#include "ble/services/DeviceInformationService.h"

BLE  ble;
DigitalOut led1(LED1);

const static char     DEVICE_NAME[]        = "HRM1";
static const uint16_t uuid16_list[]        = {GattService::UUID_HEART_RATE_SERVICE,
                                              GattService::UUID_DEVICE_INFORMATION_SERVICE};
static volatile bool  triggerSensorPolling = false;

uint8_t hrmCounter = 100; // init HRM to 100bps

HeartRateService         *hrService;
DeviceInformationService *deviceInfo;

void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
{
    ble.gap().startAdvertising(); // restart advertising
}

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

    /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
     * heavy-weight sensor polling from the main thread. */
    triggerSensorPolling = true;
}

void bleInitComplete(BLE &ble, ble_error_t error)
{
    if (error != BLE_ERROR_NONE) {
        return;
    }

    ble.gap().onDisconnection(disconnectionCallback);

    /* Setup primary service. */
    hrService = new HeartRateService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);

    /* Setup auxiliary service. */
    deviceInfo = new DeviceInformationService(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1");

    /* Setup advertising. */
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.gap().setAdvertisingInterval(1000); /* 1000ms */
    ble.gap().startAdvertising();
}

int main(void)
{
    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1); // blink LED every second

    ble.init(bleInitComplete);

    // infinite loop
    while (1) {
        // check for trigger from periodicCallback()
        if (triggerSensorPolling && ble.getGapState().connected) {
            triggerSensorPolling = false;

            // Do blocking calls or whatever is necessary for sensor polling.
            // In our case, we simply update the HRM measurement.
            hrmCounter++;
            if (hrmCounter == 175) { //  100 <= HRM bps <=175
                hrmCounter = 100;
            }

            hrService->updateHeartRate(hrmCounter);
        } else {
            ble.waitForEvent(); // low power wait for event
        }
    }
}