File content as of revision 537:00d5affbb2b2:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 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.
 */

#ifndef __BLE_H__
#define __BLE_H__

#include "blecommon.h"
#include "Gap.h"
#include "GattServer.h"
#include "GattClient.h"
#include "BLEInstanceBase.h"

/**
 * The base class used to abstract away BLE capable radio transceivers or SOCs,
 * to enable this BLE API to work with any radio transparently.
 */
class BLE
{
public:
    /**
     * Initialize the BLE controller. This should be called before using
     * anything else in the BLE_API.
     *
     * init() hands control to the underlying BLE module to accomplish
     * initialization. This initialization may tacitly depend on other hardware
     * setup (such as clocks or power-modes) which happens early on during
     * system startup. It may not be safe to call init() from global static
     * context where ordering is compiler specific and can't be guaranteed--it
     * is safe to call BLE::init() from within main().
     */
    ble_error_t init();

    /**
     * Purge the BLE stack of GATT and GAP state. init() must be called
     * afterwards to re-instate services and GAP state. This API offers a way to
     * repopulate the GATT database with new services and characteristics.
     */
    ble_error_t shutdown(void) {
        clearAdvertisingPayload();
        return transport->shutdown();
    }

    /**
     * This call allows the application to get the BLE stack version information.
     *
     * @return  A pointer to a const string representing the version.
     *          Note: The string is owned by the BLE_API.
     */
    const char *getVersion(void) {
        return transport->getVersion();
    }

    /*
     * Accessors to GAP. Please refer to Gap.h. All GAP related functionality requires
     * going through this accessor.
     */
    const Gap &gap() const {
        return transport->getGap();
    }
    Gap &gap() {
        return transport->getGap();
    }

    /**
     * Yield control to the BLE stack or to other tasks waiting for events. This
     * is a sleep function which will return when there is an application
     * specific interrupt, but the MCU might wake up several times before
     * returning (to service the stack). This is not always interchangeable with
     * WFE().
     */
    void waitForEvent(void) {
        transport->waitForEvent();
    }

    /*
     * Deprecation alert!
     * All of the following are deprecated and may be dropped in a future
     * release. Documentation should refer to alternative APIs.
     */

    /* GAP specific APIs. */
public:
    /**
     * Set the BTLE MAC address and type.
     * @return BLE_ERROR_NONE on success.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAddress(...) should be replaced with
     * ble.gap().setAddress(...).
     */
    ble_error_t setAddress(Gap::AddressType_t type, const Gap::Address_t address) {
        return gap().setAddress(type, address);
    }

    /**
     * Fetch the BTLE MAC address and type.
     * @return BLE_ERROR_NONE on success.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getAddress(...) should be replaced with
     * ble.gap().getAddress(...).
     */
    ble_error_t getAddress(Gap::AddressType_t *typeP, Gap::Address_t address) {
        return gap().getAddress(typeP, address);
    }

    /**
     * Set the GAP advertising mode to use for this device.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAdvertisingType(...) should be replaced with
     * ble.gap().setAdvertisingType(...).
     */
    void setAdvertisingType(GapAdvertisingParams::AdvertisingType advType) {
        gap().setAdvertisingType(advType);
    }

    /**
     * @param[in] interval
     *              Advertising interval in units of milliseconds. Advertising
     *              is disabled if interval is 0. If interval is smaller than
     *              the minimum supported value, then the minimum supported
     *              value is used instead. This minimum value can be discovered
     *              using getMinAdvertisingInterval().
     *
     *              This field must be set to 0 if connectionMode is equal
     *              to ADV_CONNECTABLE_DIRECTED.
     *
     * @note: Decreasing this value will allow central devices to detect a
     * peripheral faster at the expense of more power being used by the radio
     * due to the higher data transmit rate.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAdvertisingInterval(...) should be replaced with
     * ble.gap().setAdvertisingInterval(...).
     *
     * @note: [WARNING] This API previously used 0.625ms as the unit for its
     * 'interval' argument. That required an explicit conversion from
     * milliseconds using Gap::MSEC_TO_GAP_DURATION_UNITS(). This conversion is
     * no longer required as the new units are milliseconds. Any application
     * code depending on the old semantics would need to be updated accordingly.
     */
    void setAdvertisingInterval(uint16_t interval) {
        gap().setAdvertisingInterval(interval);
    }

    /**
     * @return Minimum Advertising interval in milliseconds.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getMinAdvertisingInterval(...) should be replaced with
     * ble.gap().getMinAdvertisingInterval(...).
     */
    uint16_t getMinAdvertisingInterval(void) const {
        return gap().getMinAdvertisingInterval();
    }

    /**
     * @return Minimum Advertising interval in milliseconds for non-connectible mode.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getMinNonConnectableAdvertisingInterval(...) should be replaced with
     * ble.gap().getMinNonConnectableAdvertisingInterval(...).
     */
    uint16_t getMinNonConnectableAdvertisingInterval(void) const {
        return gap().getMinNonConnectableAdvertisingInterval();
    }

    /**
     * @return Maximum Advertising interval in milliseconds.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getMaxAdvertisingInterval(...) should be replaced with
     * ble.gap().getMaxAdvertisingInterval(...).
     */
    uint16_t getMaxAdvertisingInterval(void) const {
        return gap().getMaxAdvertisingInterval();
    }

    /**
     * @param[in] timeout
     *              Advertising timeout (in seconds) between 0x1 and 0x3FFF (1
     *              and 16383). Use 0 to disable the advertising timeout.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAdvertisingTimeout(...) should be replaced with
     * ble.gap().setAdvertisingTimeout(...).
     */
    void setAdvertisingTimeout(uint16_t timeout) {
        gap().setAdvertisingTimeout(timeout);
    }

    /**
     * Setup a particular, user-constructed set of advertisement parameters for
     * the underlying stack. It would be uncommon for this API to be used
     * directly; there are other APIs to tweak advertisement parameters
     * individually (see above).
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAdvertisingParams(...) should be replaced with
     * ble.gap().setAdvertisingParams(...).
     */
    void setAdvertisingParams(const GapAdvertisingParams &advParams) {
        gap().setAdvertisingParams(advParams);
    }

    /**
     * @return  Read back advertising parameters. Useful for storing and
     *          restoring parameters rapidly.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getAdvertisingParams(...) should be replaced with
     * ble.gap().getAdvertisingParams(...).
     */
    const GapAdvertisingParams &getAdvertisingParams(void) const {
        return gap().getAdvertisingParams();
    }

    /**
     * Accumulate an AD structure in the advertising payload. Please note that
     * the payload is limited to 31 bytes. The SCAN_RESPONSE message may be used
     * as an additional 31 bytes if the advertising payload proves to be too
     * small.
     *
     * @param[in] flags
     *              The flags to be added. Please refer to
     *              GapAdvertisingData::Flags for valid flags. Multiple
     *              flags may be specified in combination.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.accumulateAdvertisingPayload(flags) should be replaced with
     * ble.gap().accumulateAdvertisingPayload(flags).
     */
    ble_error_t accumulateAdvertisingPayload(uint8_t flags) {
        return gap().accumulateAdvertisingPayload(flags);
    }

    /**
     * Accumulate an AD structure in the advertising payload. Please note that
     * the payload is limited to 31 bytes. The SCAN_RESPONSE message may be used
     * as an additional 31 bytes if the advertising payload proves to be too
     * small.
     *
     * @param[in] app
     *              The appearance of the peripheral.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.accumulateAdvertisingPayload(appearance) should be replaced with
     * ble.gap().accumulateAdvertisingPayload(appearance).
     */
    ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::Appearance app) {
        return gap().accumulateAdvertisingPayload(app);
    }

    /**
     * Accumulate an AD structure in the advertising payload. Please note that
     * the payload is limited to 31 bytes. The SCAN_RESPONSE message may be used
     * as an additional 31 bytes if the advertising payload proves to be too
     * small.
     *
     * @param[in] app
     *              The max transmit power to be used by the controller. This
     *              is only a hint.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.accumulateAdvertisingPayloadTxPower(txPower) should be replaced with
     * ble.gap().accumulateAdvertisingPayloadTxPower(txPower).
     */
    ble_error_t accumulateAdvertisingPayloadTxPower(int8_t power) {
        return gap().accumulateAdvertisingPayloadTxPower(power);
    }

    /**
     * Accumulate a variable length byte-stream as an AD structure in the
     * advertising payload. Please note that the payload is limited to 31 bytes.
     * The SCAN_RESPONSE message may be used as an additional 31 bytes if the
     * advertising payload proves to be too small.
     *
     * @param  type The type which describes the variable length data.
     * @param  data data bytes.
     * @param  len  length of data.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.accumulateAdvertisingPayload(...) should be replaced with
     * ble.gap().accumulateAdvertisingPayload(...).
     */
    ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len) {
        return gap().accumulateAdvertisingPayload(type, data, len);
    }

    /**
     * Setup a particular, user-constructed advertisement payload for the
     * underlying stack. It would be uncommon for this API to be used directly;
     * there are other APIs to build an advertisement payload (see above).
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAdvertisingData(...) should be replaced with
     * ble.gap().setAdvertisingPayload(...).
     */
    ble_error_t setAdvertisingData(const GapAdvertisingData &advData) {
        return gap().setAdvertisingPayload(advData);
    }

    /**
     * @return  Read back advertising data. Useful for storing and
     *          restoring payload.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getAdvertisingData(...) should be replaced with
     * ble.gap().getAdvertisingPayload()(...).
     */
    const GapAdvertisingData &getAdvertisingData(void) const {
        return gap().getAdvertisingPayload();
    }

    /**
     * Reset any advertising payload prepared from prior calls to
     * accumulateAdvertisingPayload(). This automatically propagates the re-
     * initialized adv payload to the underlying stack.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.clearAdvertisingPayload(...) should be replaced with
     * ble.gap().clearAdvertisingPayload(...).
     */
    void clearAdvertisingPayload(void) {
        gap().clearAdvertisingPayload();
    }

    /**
     * This API is *deprecated* and resolves to a no-operation. It is left here
     * to allow older code to compile. Please avoid using this API in new code.
     * This API will be dropped in a future release.
     *
     * Formerly, it would be used to dynamically reset the accumulated advertising
     * payload and scanResponse; to do this, the application would clear and re-
     * accumulate a new advertising payload (and scanResponse) before using this
     * API. Updates to the underlying advertisement payload now happen
     * implicitly.
     */
    ble_error_t setAdvertisingPayload(void) {
        return BLE_ERROR_NONE;
    }

    /**
     * Accumulate a variable length byte-stream as an AD structure in the
     * scanResponse payload.
     *
     * @param[in] type The type which describes the variable length data.
     * @param[in] data data bytes.
     * @param[in] len  length of data.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.accumulateScanResponse(...) should be replaced with
     * ble.gap().accumulateScanResponse(...).
     */
    ble_error_t accumulateScanResponse(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len) {
        return gap().accumulateScanResponse(type, data, len);
    }

    /**
     * Reset any scan response prepared from prior calls to
     * accumulateScanResponse().
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.clearScanResponse(...) should be replaced with
     * ble.gap().clearScanResponse(...).
     */
    void clearScanResponse(void) {
        gap().clearScanResponse();
    }

    /**
     * Start advertising.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.startAdvertising(...) should be replaced with
     * ble.gap().startAdvertising(...).
     */
    ble_error_t startAdvertising(void) {
        /* HACK ALERT! the following bit with initializeGATTDatabase() is additional to
         * gap().startAdvertising(). This was put in place to get some stacks to
         * work--like CSR. We need to reach a point where this shouldn't be
         * necessary. */
        ble_error_t rc;
        if ((rc = transport->getGattServer().initializeGATTDatabase()) != BLE_ERROR_NONE) {
            return rc;
        }

        return gap().startAdvertising();
    }

    /**
     * Stop advertising.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.stopAdvertising(...) should be replaced with
     * ble.gap().stopAdvertising(...).
     */
    ble_error_t stopAdvertising(void) {
        return gap().stopAdvertising();
    }

    /**
     * Setup parameters for GAP scanning--i.e. observer mode.
     * @param[in] interval
     *              Scan interval (in milliseconds) [valid values lie between 2.5ms and 10.24s].
     * @param[in] window
     *              Scan Window (in milliseconds) [valid values lie between 2.5ms and 10.24s].
     * @param[in] timeout
     *              Scan timeout (in seconds) between 0x0001 and 0xFFFF, 0x0000 disables timeout.
     * @param[in] activeScanning
     *              Set to True if active-scanning is required. This is used to fetch the
     *              scan response from a peer if possible.
     *
     * The scanning window divided by the interval determines the duty cycle for
     * scanning. For example, if the interval is 100ms and the window is 10ms,
     * then the controller will scan for 10 percent of the time. It is possible
     * to have the interval and window set to the same value. In this case,
     * scanning is continuous, with a change of scanning frequency once every
     * interval.
     *
     * Once the scanning parameters have been configured, scanning can be
     * enabled by using startScan().
     *
     * @Note: The scan interval and window are recommendations to the BLE stack.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setScanParams(...) should be replaced with
     * ble.gap().setScanParams(...).
     */
    ble_error_t setScanParams(uint16_t interval       = GapScanningParams::SCAN_INTERVAL_MAX,
                              uint16_t window         = GapScanningParams::SCAN_WINDOW_MAX,
                              uint16_t timeout        = 0,
                              bool     activeScanning = false) {
        return gap().setScanParams(interval, window, timeout, activeScanning);
    }

    /**
     * Setup the scanInterval parameter for GAP scanning--i.e. observer mode.
     * @param[in] interval
     *              Scan interval (in milliseconds) [valid values lie between 2.5ms and 10.24s].
     *
     * The scanning window divided by the interval determines the duty cycle for
     * scanning. For example, if the interval is 100ms and the window is 10ms,
     * then the controller will scan for 10 percent of the time. It is possible
     * to have the interval and window set to the same value. In this case,
     * scanning is continuous, with a change of scanning frequency once every
     * interval.
     *
     * Once the scanning parameters have been configured, scanning can be
     * enabled by using startScan().
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setScanInterval(interval) should be replaced with
     * ble.gap().setScanInterval(interval).
     */
    ble_error_t setScanInterval(uint16_t interval) {
        return gap().setScanInterval(interval);
    }

    /**
     * Setup the scanWindow parameter for GAP scanning--i.e. observer mode.
     * @param[in] window
     *              Scan Window (in milliseconds) [valid values lie between 2.5ms and 10.24s].
     *
     * The scanning window divided by the interval determines the duty cycle for
     * scanning. For example, if the interval is 100ms and the window is 10ms,
     * then the controller will scan for 10 percent of the time. It is possible
     * to have the interval and window set to the same value. In this case,
     * scanning is continuous, with a change of scanning frequency once every
     * interval.
     *
     * Once the scanning parameters have been configured, scanning can be
     * enabled by using startScan().
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setScanWindow(window) should be replaced with
     * ble.gap().setScanWindow(window).
     */
    ble_error_t setScanWindow(uint16_t window) {
        return gap().setScanWindow(window);
    }

    /**
     * Setup parameters for GAP scanning--i.e. observer mode.
     * @param[in] timeout
     *              Scan timeout (in seconds) between 0x0001 and 0xFFFF, 0x0000 disables timeout.
     *
     * The scanning window divided by the interval determines the duty cycle for
     * scanning. For example, if the interval is 100ms and the window is 10ms,
     * then the controller will scan for 10 percent of the time. It is possible
     * to have the interval and window set to the same value. In this case,
     * scanning is continuous, with a change of scanning frequency once every
     * interval.
     *
     * Once the scanning parameters have been configured, scanning can be
     * enabled by using startScan().
     *
     * @Note: The scan interval and window are recommendations to the BLE stack.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setScanTimeout(...) should be replaced with
     * ble.gap().setScanTimeout(...).
     */
    ble_error_t setScanTimeout(uint16_t timeout) {
        return gap().setScanTimeout(timeout);
    }

    /**
     * Setup parameters for GAP scanning--i.e. observer mode.
     * @param[in] activeScanning
     *              Set to True if active-scanning is required. This is used to fetch the
     *              scan response from a peer if possible.
     *
     * Once the scanning parameters have been configured, scanning can be
     * enabled by using startScan().
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setActiveScan(...) should be replaced with
     * ble.gap().setActiveScanning(...).
     */
    void setActiveScan(bool activeScanning) {
        gap().setActiveScanning(activeScanning);
    }

    /**
     * Start scanning (Observer Procedure) based on the parameters currently in
     * effect.
     *
     * @param[in] callback
     *              The application specific callback to be invoked upon
     *              receiving every advertisement report. This can be passed in
     *              as NULL, in which case scanning may not be enabled at all.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.startScan(callback) should be replaced with
     * ble.gap().startScan(callback).
     */
    ble_error_t startScan(void (*callback)(const Gap::AdvertisementCallbackParams_t *params)) {
        return gap().startScan(callback);
    }

    /**
     * Same as above, but this takes an (object, method) pair for a callback.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.startScan(callback) should be replaced with
     * ble.gap().startScan(object, callback).
     */
    template<typename T>
    ble_error_t startScan(T *object, void (T::*memberCallback)(const Gap::AdvertisementCallbackParams_t *params));

    /**
     * Stop scanning. The current scanning parameters remain in effect.
     *
     * @retval BLE_ERROR_NONE if successfully stopped scanning procedure.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.stopScan() should be replaced with
     * ble.gap().stopScan().
     */
    ble_error_t stopScan(void) {
        return gap().stopScan();
    }

    /**
     * Create a connection (GAP Link Establishment).
     * @param peerAddr
     *          48-bit address, LSB format.
     * @param peerAddrType
     *          Address type of the peer.
     * @param connectionParams
     *         Connection parameters.
     * @param scanParams
     *          Paramters to be used while scanning for the peer.
     * @return  BLE_ERROR_NONE if connection establishment procedure is started
     *     successfully. The onConnection callback (if set) will be invoked upon
     *     a connection event.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.connect(...) should be replaced with
     * ble.gap().connect(...).
     */
    ble_error_t connect(const Gap::Address_t           peerAddr,
                        Gap::AddressType_t             peerAddrType = Gap::ADDR_TYPE_RANDOM_STATIC,
                        const Gap::ConnectionParams_t *connectionParams = NULL,
                        const GapScanningParams       *scanParams = NULL) {
        return gap().connect(peerAddr, peerAddrType, connectionParams, scanParams);
    }

    /**
     * This call initiates the disconnection procedure, and its completion will
     * be communicated to the application with an invocation of the
     * onDisconnection callback.
     *
     * @param  reason
     *           The reason for disconnection to be sent back to the peer.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.disconnect(reason) should be replaced with
     * ble.gap().disconnect(reason).
     */
    ble_error_t disconnect(Gap::DisconnectionReason_t reason) {
        return gap().disconnect(reason);
    }

    /**
     * Returns the current GAP state of the device using a bitmask which
     * describes whether the device is advertising and/or connected.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getGapState() should be replaced with
     * ble.gap().getState().
     */
    Gap::GapState_t getGapState(void) const {
        return gap().getState();
    }

    /**
     * Get the GAP peripheral preferred connection parameters. These are the
     * defaults that the peripheral would like to have in a connection. The
     * choice of the connection parameters is eventually up to the central.
     *
     * @param[out] params
     *               The structure where the parameters will be stored. Memory
     *               for this is owned by the caller.
     *
     * @return BLE_ERROR_NONE if the parameters were successfully filled into
     * the given structure pointed to by params.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getPreferredConnectionParams() should be replaced with
     * ble.gap().getPreferredConnectionParams().
     */
    ble_error_t getPreferredConnectionParams(Gap::ConnectionParams_t *params) {
        return gap().getPreferredConnectionParams(params);
    }

    /**
     * Set the GAP peripheral preferred connection parameters. These are the
     * defaults that the peripheral would like to have in a connection. The
     * choice of the connection parameters is eventually up to the central.
     *
     * @param[in] params
     *               The structure containing the desired parameters.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setPreferredConnectionParams() should be replaced with
     * ble.gap().setPreferredConnectionParams().
     */
    ble_error_t setPreferredConnectionParams(const Gap::ConnectionParams_t *params) {
        return gap().setPreferredConnectionParams(params);
    }

    /**
     * Update connection parameters while in the peripheral role.
     * @details In the peripheral role, this will send the corresponding L2CAP request to the connected peer and wait for
     *          the central to perform the procedure.
     * @param[in] handle
     *              Connection Handle
     * @param[in] params
     *              Pointer to desired connection parameters. If NULL is provided on a peripheral role,
     *              the parameters in the PPCP characteristic of the GAP service will be used instead.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.updateConnectionParams() should be replaced with
     * ble.gap().updateConnectionParams().
     */
    ble_error_t updateConnectionParams(Gap::Handle_t handle, const Gap::ConnectionParams_t *params) {
        return gap().updateConnectionParams(handle, params);
    }

    /**
     * Set the device name characteristic in the GAP service.
     * @param[in] deviceName
     *              The new value for the device-name. This is a UTF-8 encoded, <b>NULL-terminated</b> string.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setDeviceName() should be replaced with
     * ble.gap().setDeviceName().
     */
    ble_error_t setDeviceName(const uint8_t *deviceName) {
        return gap().setDeviceName(deviceName);
    }

    /**
     * Get the value of the device name characteristic in the GAP service.
     * @param[out]    deviceName
     *                  Pointer to an empty buffer where the UTF-8 *non NULL-
     *                  terminated* string will be placed. Set this
     *                  value to NULL in order to obtain the deviceName-length
     *                  from the 'length' parameter.
     *
     * @param[in/out] lengthP
     *                  (on input) Length of the buffer pointed to by deviceName;
     *                  (on output) the complete device name length (without the
     *                     null terminator).
     *
     * @note If the device name is longer than the size of the supplied buffer,
     *     length will return the complete device name length, and not the
     *     number of bytes actually returned in deviceName. The application may
     *     use this information to retry with a suitable buffer size.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getDeviceName() should be replaced with
     * ble.gap().getDeviceName().
     */
    ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP) {
        return gap().getDeviceName(deviceName, lengthP);
    }

    /**
     * Set the appearance characteristic in the GAP service.
     * @param[in] appearance
     *              The new value for the device-appearance.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setAppearance() should be replaced with
     * ble.gap().setAppearance().
     */
    ble_error_t setAppearance(GapAdvertisingData::Appearance appearance) {
        return gap().setAppearance(appearance);
    }

    /**
     * Get the appearance characteristic in the GAP service.
     * @param[out] appearance
     *               The new value for the device-appearance.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getAppearance() should be replaced with
     * ble.gap().getAppearance().
     */
    ble_error_t getAppearance(GapAdvertisingData::Appearance *appearanceP) {
        return gap().getAppearance(appearanceP);
    }

    /**
     * Set the radio's transmit power.
     * @param[in] txPower Radio transmit power in dBm.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.setTxPower() should be replaced with
     * ble.gap().setTxPower().
     */
    ble_error_t setTxPower(int8_t txPower) {
        return gap().setTxPower(txPower);
    }

    /**
     * Query the underlying stack for permitted arguments for setTxPower().
     *
     * @param[out] valueArrayPP
     *                 Out parameter to receive the immutable array of Tx values.
     * @param[out] countP
     *                 Out parameter to receive the array's size.
     *
     * @note: This API is now *deprecated* and will be dropped in the future.
     * You should use the parallel API from Gap directly. A former call to
     * ble.getPermittedTxPowerValues() should be replaced with
     * ble.gap().getPermittedTxPowerValues().
     */
    void getPermittedTxPowerValues(const int8_t **valueArrayPP, size_t *countP) {
        gap().getPermittedTxPowerValues(valueArrayPP, countP);
    }

    /* APIs to set GAP callbacks. */
    void onTimeout(Gap::EventCallback_t timeoutCallback);

    void onConnection(Gap::ConnectionEventCallback_t connectionCallback);
    /**
     * Used to setup a callback for GAP disconnection.
     */
    void onDisconnection(Gap::DisconnectionEventCallback_t disconnectionCallback);

    /**
     * Append to a chain of callbacks to be invoked upon disconnection; these
     * callbacks receive no context and are therefore different from the
     * onDisconnection callback.
     */
    template<typename T>
    void addToDisconnectionCallChain(T *tptr, void (T::*mptr)(void));

    /**
     * Add a callback for the GATT event DATA_SENT (which is triggered when
     * updates are sent out by GATT in the form of notifications).
     *
     * @Note: it is possible to chain together multiple onDataSent callbacks
     * (potentially from different modules of an application) to receive updates
     * to characteristics.
     *
     * @Note: it is also possible to setup a callback into a member function of
     * some object.
     */
    void onDataSent(void (*callback)(unsigned count));
    template <typename T> void onDataSent(T * objPtr, void (T::*memberPtr)(unsigned count));

    /**
     * Setup a callback for when a characteristic has its value updated by a
     * client.
     *
     * @Note: it is possible to chain together multiple onDataWritten callbacks
     * (potentially from different modules of an application) to receive updates
     * to characteristics. Many services, such as DFU and UART add their own
     * onDataWritten callbacks behind the scenes to trap interesting events.
     *
     * @Note: it is also possible to setup a callback into a member function of
     * some object.
     */
    void onDataWritten(void (*callback)(const GattWriteCallbackParams *eventDataP));
    template <typename T> void onDataWritten(T * objPtr, void (T::*memberPtr)(const GattWriteCallbackParams *context));

    /**
     * Setup a callback for when a characteristic is being read by a client.
     *
     * @Note: this functionality may not be available on all underlying stacks.
     * You could use GattCharacteristic::setReadAuthorizationCallback() as an
     * alternative.
     *
     * @Note: it is possible to chain together multiple onDataRead callbacks
     * (potentially from different modules of an application) to receive updates
     * to characteristics. Services may add their own onDataRead callbacks
     * behind the scenes to trap interesting events.
     *
     * @Note: it is also possible to setup a callback into a member function of
     * some object.
     *
     * @return BLE_ERROR_NOT_IMPLEMENTED if this functionality isn't available;
     *         else BLE_ERROR_NONE.
     */
    ble_error_t onDataRead(void (*callback)(const GattReadCallbackParams *eventDataP));
    template <typename T> ble_error_t onDataRead(T * objPtr, void (T::*memberPtr)(const GattReadCallbackParams *context));

    void onUpdatesEnabled(GattServer::EventCallback_t callback);
    void onUpdatesDisabled(GattServer::EventCallback_t callback);
    void onConfirmationReceived(GattServer::EventCallback_t callback);

    /**
     * Radio Notification is a feature that enables ACTIVE and INACTIVE
     * (nACTIVE) signals from the stack that notify the application when the
     * radio is in use. The signal is sent using software interrupt.
     *
     * The ACTIVE signal is sent before the Radio Event starts. The nACTIVE
     * signal is sent at the end of the Radio Event. These signals can be used
     * by the application programmer to synchronize application logic with radio
     * activity. For example, the ACTIVE signal can be used to shut off external
     * devices to manage peak current drawn during periods when the radio is on,
     * or to trigger sensor data collection for transmission in the Radio Event.
     *
     * @param callback
     *          The application handler to be invoked in response to a radio
     *          ACTIVE/INACTIVE event.
     */
    void onRadioNotification(Gap::RadioNotificationEventCallback_t callback);

    /**
     * Add a service declaration to the local server ATT table. Also add the
     * characteristics contained within.
     */
    ble_error_t addService(GattService &service);

    /**
     * @param[in/out]  lengthP
     *     input:  Length in bytes to be read,
     *     output: Total length of attribute value upon successful return.
     */
    ble_error_t readCharacteristicValue(GattAttribute::Handle_t attributeHandle, uint8_t *buffer, uint16_t *lengthP);
    /**
     * A version of the same as above with connection handle parameter to allow fetches for connection-specific multivalued attribtues (such as the CCCDs).
     */
    ble_error_t readCharacteristicValue(Gap::Handle_t connectionHandle, GattAttribute::Handle_t attributeHandle, uint8_t *buffer, uint16_t *lengthP);

    /**
     * @param  localOnly
     *         Only update the characteristic locally regardless of notify/indicate flags in the CCCD.
     */
    ble_error_t updateCharacteristicValue(GattAttribute::Handle_t attributeHandle, const uint8_t *value, uint16_t size, bool localOnly = false);
    /**
     * A version of the same as above with connection handle parameter to allow updates for connection-specific multivalued attribtues (such as the CCCDs).
     */
    ble_error_t updateCharacteristicValue(Gap::Handle_t            connectionHandle,
                                          GattAttribute::Handle_t  attributeHandle,
                                          const uint8_t           *value,
                                          uint16_t                 size,
                                          bool                     localOnly = false);

    /**
     * Enable the BLE stack's Security Manager. The Security Manager implements
     * the actual cryptographic algorithms and protocol exchanges that allow two
     * devices to securely exchange data and privately detect each other.
     * Calling this API is a prerequisite for encryption and pairing (bonding).
     *
     * @param[in]  enableBonding Allow for bonding.
     * @param[in]  requireMITM   Require protection for man-in-the-middle attacks.
     * @param[in]  iocaps        To specify IO capabilities of this peripheral,
     *                           such as availability of a display or keyboard to
     *                           support out-of-band exchanges of security data.
     * @param[in]  passkey       To specify a static passkey.
     *
     * @return BLE_ERROR_NONE on success.
     */
    ble_error_t initializeSecurity(bool                          enableBonding = true,
                                   bool                          requireMITM   = true,
                                   Gap::SecurityIOCapabilities_t iocaps        = Gap::IO_CAPS_NONE,
                                   const Gap::Passkey_t          passkey       = NULL);

    /**
     * Setup a callback for when the security setup procedure (key generation
     * and exchange) for a link has started. This will be skipped for bonded
     * devices. The callback is passed in parameters received from the peer's
     * security request: bool allowBonding, bool requireMITM, and
     * SecurityIOCapabilities_t.
     */
    void onSecuritySetupInitiated(Gap::SecuritySetupInitiatedCallback_t callback);

    /**
     * Setup a callback for when the security setup procedure (key generation
     * and exchange) for a link has completed. This will be skipped for bonded
     * devices. The callback is passed in the success/failure status of the
     * security setup procedure.
     */
    void onSecuritySetupCompleted(Gap::SecuritySetupCompletedCallback_t callback);

    /**
     * Setup a callback for when a link with the peer is secured. For bonded
     * devices, subsequent reconnections with bonded peer will result only in
     * this callback when the link is secured and setup procedures will not
     * occur unless the bonding information is either lost or deleted on either
     * or both sides. The callback is passed in a Gap::SecurityMode_t according
     * to the level of security in effect for the secured link.
     */
    void onLinkSecured(Gap::LinkSecuredCallback_t callback);

    /**
     * Setup a callback for successful bonding; i.e. that link-specific security
     * context is stored persistently for a peer device.
     */
    void onSecurityContextStored(Gap::HandleSpecificEvent_t callback);

    /**
     * Setup a callback for when the passkey needs to be displayed on a
     * peripheral with DISPLAY capability. This happens when security is
     * configured to prevent Man-In-The-Middle attacks, and a PIN (or passkey)
     * needs to be exchanged between the peers to authenticate the connection
     * attempt.
     */
    void onPasskeyDisplay(Gap::PasskeyDisplayCallback_t callback);

    /**
     * Get the security status of a connection.
     *
     * @param[in]  connectionHandle   Handle to identify the connection.
     * @param[out] securityStatusP    security status.
     *
     * @return BLE_SUCCESS Or appropriate error code indicating reason for failure.
     */
    ble_error_t getLinkSecurity(Gap::Handle_t connectionHandle, Gap::LinkSecurityStatus_t *securityStatusP);

    /**
     * Delete all peer device context and all related bonding information from
     * the database within the security manager.
     *
     * @retval BLE_ERROR_NONE             On success, else an error code indicating reason for failure.
     * @retval BLE_ERROR_INVALID_STATE    If the API is called without module initialization and/or
     *                                    application registration.
     */
    ble_error_t purgeAllBondingState(void);

    /**
     * Launch service discovery. Once launched, service discovery will remain
     * active with callbacks being issued back into the application for matching
     * services/characteristics. isServiceDiscoveryActive() can be used to
     * determine status; and a termination callback (if setup) will be invoked
     * at the end. Service discovery can be terminated prematurely if needed
     * using terminateServiceDiscovery().
     *
     * @param  connectionHandle
     *           Handle for the connection with the peer.
     * @param  sc
     *           This is the application callback for matching service. Taken as
     *           NULL by default. Note: service discovery may still be active
     *           when this callback is issued; calling asynchronous BLE-stack
     *           APIs from within this application callback might cause the
     *           stack to abort service discovery. If this becomes an issue, it
     *           may be better to make local copy of the discoveredService and
     *           wait for service discovery to terminate before operating on the
     *           service.
     * @param  cc
     *           This is the application callback for matching characteristic.
     *           Taken as NULL by default. Note: service discovery may still be
     *           active when this callback is issued; calling asynchronous
     *           BLE-stack APIs from within this application callback might cause
     *           the stack to abort service discovery. If this becomes an issue,
     *           it may be better to make local copy of the discoveredCharacteristic
     *           and wait for service discovery to terminate before operating on the
     *           characteristic.
     * @param  matchingServiceUUID
     *           UUID based filter for specifying a service in which the application is
     *           interested. By default it is set as the wildcard UUID_UNKNOWN,
     *           in which case it matches all services. If characteristic-UUID
     *           filter (below) is set to the wildcard value, then a service
     *           callback will be invoked for the matching service (or for every
     *           service if the service filter is a wildcard).
     * @param  matchingCharacteristicUUIDIn
     *           UUID based filter for specifying characteristic in which the application
     *           is interested. By default it is set as the wildcard UUID_UKNOWN
     *           to match against any characteristic. If both service-UUID
     *           filter and characteristic-UUID filter are used with non- wildcard
     *           values, then only a single characteristic callback is
     *           invoked for the matching characteristic.
     *
     * @Note     Using wildcard values for both service-UUID and characteristic-
     *           UUID will result in complete service discovery--callbacks being
     *           called for every service and characteristic.
     *
     * @return
     *           BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
     */
    ble_error_t launchServiceDiscovery(Gap::Handle_t                               connectionHandle,
                                       ServiceDiscovery::ServiceCallback_t         sc = NULL,
                                       ServiceDiscovery::CharacteristicCallback_t  cc = NULL,
                                       const UUID                                 &matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN),
                                       const UUID                                 &matchingCharacteristicUUIDIn = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN));

    /**
     * Setup callback for when serviceDiscovery terminates.
     */
    void onServiceDiscoveryTermination(ServiceDiscovery::TerminationCallback_t callback);

    /**
     * Is service-discovery currently active?
     */
    bool isServiceDiscoveryActive(void);

    /**
     * Terminate an ongoing service-discovery. This should result in an
     * invocation of the TerminationCallback if service-discovery is active.
     */
    void terminateServiceDiscovery(void);

public:
    BLE() : transport(createBLEInstance()) {
        /* empty */
    }

private:
    BLEInstanceBase *const transport; /* the device specific backend */
};

typedef BLE BLEDevice; /* DEPRECATED. This type alias is retained for the sake of compatibility with older
                        * code. Will be dropped at some point soon.*/

/* BLE methods. Most of these simply forward the calls to the underlying
 * transport.*/

inline void
BLE::onTimeout(Gap::EventCallback_t timeoutCallback)
{
    gap().setOnTimeout(timeoutCallback);
}

inline void
BLE::onConnection(Gap::ConnectionEventCallback_t connectionCallback)
{
    gap().setOnConnection(connectionCallback);
}

inline void
BLE::onDisconnection(Gap::DisconnectionEventCallback_t disconnectionCallback)
{
    gap().setOnDisconnection(disconnectionCallback);
}

template<typename T>
inline void
BLE::addToDisconnectionCallChain(T *tptr, void (T::*mptr)(void)) {
    gap().addToDisconnectionCallChain(tptr, mptr);
}

inline void
BLE::onDataSent(void (*callback)(unsigned count)) {
    transport->getGattServer().setOnDataSent(callback);
}

template <typename T> inline void
BLE::onDataSent(T *objPtr, void (T::*memberPtr)(unsigned count)) {
    transport->getGattServer().setOnDataSent(objPtr, memberPtr);
}

inline void
BLE::onDataWritten(void (*callback)(const GattWriteCallbackParams *eventDataP)) {
    transport->getGattServer().setOnDataWritten(callback);
}

template <typename T> inline void
BLE::onDataWritten(T *objPtr, void (T::*memberPtr)(const GattWriteCallbackParams *context)) {
    transport->getGattServer().setOnDataWritten(objPtr, memberPtr);
}

inline ble_error_t
BLE::onDataRead(void (*callback)(const GattReadCallbackParams *eventDataP)) {
    return transport->getGattServer().setOnDataRead(callback);
}

template <typename T> inline ble_error_t
BLE::onDataRead(T *objPtr, void (T::*memberPtr)(const GattReadCallbackParams *context)) {
    return transport->getGattServer().setOnDataRead(objPtr, memberPtr);
}

inline void
BLE::onUpdatesEnabled(GattServer::EventCallback_t callback)
{
    transport->getGattServer().setOnUpdatesEnabled(callback);
}

inline void
BLE::onUpdatesDisabled(GattServer::EventCallback_t callback)
{
    transport->getGattServer().setOnUpdatesDisabled(callback);
}

inline void
BLE::onConfirmationReceived(GattServer::EventCallback_t callback)
{
    transport->getGattServer().setOnConfirmationReceived(callback);
}

inline void
BLE::onRadioNotification(Gap::RadioNotificationEventCallback_t callback)
{
    gap().setOnRadioNotification(callback);
}

inline ble_error_t
BLE::addService(GattService &service)
{
    return transport->getGattServer().addService(service);
}

inline ble_error_t
BLE::readCharacteristicValue(GattAttribute::Handle_t attributeHandle, uint8_t *buffer, uint16_t *lengthP)
{
    return transport->getGattServer().readValue(attributeHandle, buffer, lengthP);
}

inline ble_error_t
BLE::readCharacteristicValue(Gap::Handle_t            connectionHandle,
                             GattAttribute::Handle_t  attributeHandle,
                             uint8_t                 *buffer,
                             uint16_t                *lengthP)
{
    return transport->getGattServer().readValue(connectionHandle, attributeHandle, buffer, lengthP);
}

inline ble_error_t
BLE::updateCharacteristicValue(GattAttribute::Handle_t attributeHandle, const uint8_t *value, uint16_t size, bool localOnly)
{
    return transport->getGattServer().updateValue(attributeHandle, const_cast<uint8_t *>(value), size, localOnly);
}

inline ble_error_t
BLE::updateCharacteristicValue(Gap::Handle_t            connectionHandle,
                               GattAttribute::Handle_t  attributeHandle,
                               const uint8_t           *value,
                               uint16_t                 size,
                               bool                     localOnly)
{
    return transport->getGattServer().updateValue(connectionHandle, attributeHandle, const_cast<uint8_t *>(value), size, localOnly);
}

inline ble_error_t
BLE::initializeSecurity(bool                          enableBonding,
                        bool                          requireMITM,
                        Gap::SecurityIOCapabilities_t iocaps,
                        const Gap::Passkey_t          passkey)
{
    return transport->initializeSecurity(enableBonding, requireMITM, iocaps, passkey);
}

inline void
BLE::onSecuritySetupInitiated(Gap::SecuritySetupInitiatedCallback_t callback)
{
    gap().setOnSecuritySetupInitiated(callback);
}

inline void
BLE::onSecuritySetupCompleted(Gap::SecuritySetupCompletedCallback_t callback)
{
    gap().setOnSecuritySetupCompleted(callback);
}

inline void
BLE::onLinkSecured(Gap::LinkSecuredCallback_t callback)
{
    gap().setOnLinkSecured(callback);
}

inline void
BLE::onSecurityContextStored(Gap::HandleSpecificEvent_t callback)
{
    gap().setOnSecurityContextStored(callback);
}

inline void
BLE::onPasskeyDisplay(Gap::PasskeyDisplayCallback_t callback)
{
    return gap().setOnPasskeyDisplay(callback);
}

inline ble_error_t
BLE::getLinkSecurity(Gap::Handle_t connectionHandle, Gap::LinkSecurityStatus_t *securityStatusP)
{
    return gap().getLinkSecurity(connectionHandle, securityStatusP);
}

inline ble_error_t
BLE::purgeAllBondingState(void)
{
    return gap().purgeAllBondingState();
}

inline ble_error_t
BLE::launchServiceDiscovery(Gap::Handle_t                               connectionHandle,
                            ServiceDiscovery::ServiceCallback_t         sc,
                            ServiceDiscovery::CharacteristicCallback_t  cc,
                            const UUID                                 &matchingServiceUUID,
                            const UUID                                 &matchingCharacteristicUUID)
{
    return transport->getGattClient().launchServiceDiscovery(connectionHandle, sc, cc, matchingServiceUUID, matchingCharacteristicUUID);
}

inline void
BLE::onServiceDiscoveryTermination(ServiceDiscovery::TerminationCallback_t callback)
{
    transport->getGattClient().onServiceDiscoveryTermination(callback);
}

/**
 * Is service-discovery currently active?
 */
inline bool
BLE::isServiceDiscoveryActive(void)
{
    return transport->getGattClient().isServiceDiscoveryActive();
}

/**
 * Terminate an ongoing service-discovery. This should result in an
 * invocation of the TerminationCallback if service-discovery is active.
 */
inline void
BLE::terminateServiceDiscovery(void)
{
    transport->getGattClient().terminateServiceDiscovery();
}

#endif // ifndef __BLE_H__