Diff: public/BLE.h

Revision:

528:8d21604fe31d

Child:

529:ccfae9d8e56e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/public/BLE.h	Fri Jun 19 15:52:07 2015 +0100
@@ -0,0 +1,1245 @@
+/* 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"
+
+#include "GapAdvertisingData.h"
+#include "GapAdvertisingParams.h"
+#include "GapScanningParams.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();
+
+    ble_error_t reset(void);
+
+    /**
+     * Purge the BLE stack of GATT and GAP state. init() must be called afterwards to re-instate services and GAP state.
+     */
+    ble_error_t shutdown(void);
+
+    /* GAP specific APIs */
+public:
+    /**
+     * Set the BTLE MAC address and type.
+     * @return BLE_ERROR_NONE on success.
+     */
+    ble_error_t setAddress(Gap::AddressType_t type, const Gap::Address_t address);
+
+    /**
+     * Fetch the BTLE MAC address and type.
+     * @return BLE_ERROR_NONE on success.
+     */
+    ble_error_t getAddress(Gap::AddressType_t *typeP, Gap::Address_t address);
+
+    /**
+     * @param[in] advType
+     *              The GAP advertising mode to use for this device. Valid
+     *              values are defined in AdvertisingType:
+     *
+     *              \par ADV_NON_CONNECTABLE_UNDIRECTED
+     *              All connections to the peripheral device will be refused.
+     *
+     *              \par ADV_CONNECTABLE_DIRECTED
+     *              Only connections from a pre-defined central device will be
+     *              accepted.
+     *
+     *              \par ADV_CONNECTABLE_UNDIRECTED
+     *              Any central device can connect to this peripheral.
+     *
+     *              \par ADV_SCANNABLE_UNDIRECTED
+     *              Include support for Scan Response payloads.
+     *
+     *              \par
+     *              See Bluetooth Core Specification 4.0 (Vol. 3), Part C,
+     *              Section 9.3 and Core Specification 4.0 (Vol. 6), Part B,
+     *              Section 2.3.1 for further information on GAP connection
+     *              modes
+     */
+    void        setAdvertisingType(GapAdvertisingParams::AdvertisingType);
+
+    /**
+     * @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.
+     *
+     *              \par
+     *              Decreasing this value will allow central devices to detect
+     *              your peripheral faster at the expense of more power being
+     *              used by the radio due to the higher data transmit rate.
+     *
+     *              \par
+     *              This field must be set to 0 if connectionMode is equal
+     *              to ADV_CONNECTABLE_DIRECTED
+     *
+     *              \par
+     *              See Bluetooth Core Specification, Vol 3., Part C,
+     *              Appendix A for suggested advertising intervals.
+     *
+     * @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);
+
+    /**
+     * @return Minimum Advertising interval in milliseconds.
+     */
+    uint16_t    getMinAdvertisingInterval(void) const;
+    /**
+     * @return Minimum Advertising interval in milliseconds for non connectible mode.
+     */
+    uint16_t    getMinNonConnectableAdvertisingInterval(void) const;
+    /**
+     * @return Maximum Advertising interval in milliseconds.
+     */
+    uint16_t    getMaxAdvertisingInterval(void) const;
+
+    /**
+     * @param[in] timeout
+     *              Advertising timeout between 0x1 and 0x3FFF (1 and 16383)
+     *              in seconds.  Enter 0 to disable the advertising timeout.
+     */
+    void        setAdvertisingTimeout(uint16_t timeout);
+
+    /**
+     * Please refer to the APIs above.
+     */
+    void        setAdvertisingParams(const GapAdvertisingParams &advParams);
+
+    /**
+     * @return  Read back advertising parameters. Useful for storing and
+     *          restoring parameters rapidly.
+     */
+    const GapAdvertisingParams &getAdvertisingParams(void) const;
+
+    /**
+     * This API is typically used as an internal helper to udpate the transport
+     * backend with advertising data before starting to advertise. It may also
+     * be explicity used to dynamically reset the accumulated advertising
+     * payload and scanResponse; to do this, the application can clear and re-
+     * accumulate a new advertising payload (and scanResponse) before using this
+     * API.
+     */
+    ble_error_t setAdvertisingPayload(void);
+
+    /**
+     * Set advertising data using object.
+     */
+    ble_error_t setAdvertisingData(const GapAdvertisingData &advData);
+
+    /**
+     * @return  Read back advertising data. Useful for storing and
+     *          restoring payload.
+     */
+    const GapAdvertisingData &getAdvertisingData(void) const;
+
+    /**
+     * Reset any advertising payload prepared from prior calls to
+     * accumulateAdvertisingPayload().
+     *
+     * Note: This should be followed by a call to setAdvertisingPayload() or
+     * startAdvertising() before the update takes effect.
+     */
+    void        clearAdvertisingPayload(void);
+
+    /**
+     * 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  flags
+     *         The flags to be added. Multiple flags may be specified in
+     *         combination.
+     */
+    ble_error_t accumulateAdvertisingPayload(uint8_t 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  app
+     *         The appearance of the peripheral.
+     */
+    ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::Appearance 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  app
+     *         The max transmit power to be used by the controller. This is
+     *         only a hint.
+     */
+    ble_error_t accumulateAdvertisingPayloadTxPower(int8_t 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.
+     */
+    ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len);
+
+    /**
+     * Accumulate a variable length byte-stream as an AD structure in the
+     * scanResponse payload.
+     *
+     * @param  type The type which describes the variable length data.
+     * @param  data data bytes.
+     * @param  len  length of data.
+     */
+    ble_error_t accumulateScanResponse(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len);
+
+    /**
+     * Reset any scan response prepared from prior calls to
+     * accumulateScanResponse().
+     *
+     * Note: This should be followed by a call to setAdvertisingPayload() or
+     * startAdvertising() before the update takes effect.
+     */
+    void        clearScanResponse(void);
+
+    /**
+     * Start advertising (GAP Discoverable, Connectable modes, Broadcast
+     * Procedure).
+     */
+    ble_error_t startAdvertising(void);
+
+    /**
+     * Stop advertising (GAP Discoverable, Connectable modes, Broadcast
+     * Procedure).
+     */
+    ble_error_t stopAdvertising(void);
+
+    /**
+     * Setup parameters for GAP scanning--i.e. observer mode.
+     * @param  interval Scan interval (in milliseconds) [valid values lie between 2.5ms and 10.24s].
+     * @param  window   Scan Window (in milliseconds) [valid values lie between 2.5ms and 10.24s].
+     * @param  timeout  Scan timeout (in seconds) between 0x0001 and 0xFFFF, 0x0000 disables timeout.
+     * @param  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.
+     */
+    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);
+    ble_error_t setScanInterval(uint16_t interval);
+    ble_error_t setScanWindow  (uint16_t window);
+    ble_error_t setScanTimeout (uint16_t timeout);
+    void        setActiveScan  (bool     activeScanning);
+
+    /**
+     * Start scanning (Observer Procedure) based on the scan-params currently
+     * in effect.
+     *
+     * @param  callback The application callback to be invoked upon receiving
+     *     every advertisement report. Can be passed in as NULL, in which case
+     *     scanning may not be enabled at all.
+     */
+    ble_error_t startScan(void (*callback)(const Gap::AdvertisementCallbackParams_t *params));
+
+    /**
+     * Start scanning (Observer Procedure) based on the scan-params currently
+     * in effect.
+     *
+     * @param[in] object
+     * @param[in] callbackMember
+     *                The above pair of parameters define the callback object
+     *                and member function to receive the advertisement params.
+     */
+    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.
+     */
+    ble_error_t stopScan(void);
+
+    /**
+     * 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.
+     */
+    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);
+
+    /**
+     * 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.
+     */
+    ble_error_t disconnect(Gap::DisconnectionReason_t reason);
+
+    /* 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);
+
+    /**
+     * Returns the current GAP state of the device using a bitmask which
+     * describes whether the device is advertising and/or connected.
+     */
+    Gap::GapState_t getGapState(void) const;
+
+    /**
+     * @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);
+
+    /**
+     * 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);
+
+    ble_error_t getPreferredConnectionParams(Gap::ConnectionParams_t *params);
+    ble_error_t setPreferredConnectionParams(const Gap::ConnectionParams_t *params);
+    ble_error_t updateConnectionParams(Gap::Handle_t handle, const Gap::ConnectionParams_t *params);
+
+    /**
+     * 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);
+
+    /**
+     * Set the device name characteristic in the GAP service.
+     * @param  deviceName The new value for the device-name. This is a UTF-8 encoded, <b>NULL-terminated</b> string.
+     */
+    ble_error_t setDeviceName(const uint8_t *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.
+     *
+     * Sample use:
+     *     uint8_t deviceName[20];
+     *     unsigned length = sizeof(deviceName);
+     *     ble.getDeviceName(deviceName, &length);
+     *     if (length < sizeof(deviceName)) {
+     *         deviceName[length] = 0;
+     *     }
+     *     DEBUG("length: %u, deviceName: %s\r\n", length, deviceName);
+     */
+    ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP);
+
+    /**
+     * Set the appearance characteristic in the GAP service.
+     * @param[in]  appearance The new value for the device-appearance.
+     */
+    ble_error_t setAppearance(uint16_t appearance);
+
+    /**
+     * Set the appearance characteristic in the GAP service.
+     * @param[out]  appearance The new value for the device-appearance.
+     */
+    ble_error_t getAppearance(uint16_t *appearanceP);
+
+    /**
+     * Set the radio's transmit power.
+     * @param[in] txPower Radio transmit power in dBm.
+     */
+    ble_error_t setTxPower(int8_t 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.
+     */
+    void getPermittedTxPowerValues(const int8_t **valueArrayPP, size_t *countP);
+
+    /**
+     * 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()), advParams(), advPayload(), scanResponse(), needToSetAdvPayload(true), scanningParams() {
+        advPayload.clear();
+        scanResponse.clear();
+    }
+
+private:
+    BLEInstanceBase *const transport; /* the device specific backend */
+
+    GapAdvertisingParams advParams;
+    GapAdvertisingData   advPayload;
+    GapAdvertisingData   scanResponse;
+
+    /* Accumulation of AD structures in the advertisement payload should
+     * eventually result in a call to the target's setAdvertisingData() before
+     * the server begins advertising. This flag marks the status of the pending update.*/
+    bool                 needToSetAdvPayload;
+
+    GapScanningParams    scanningParams;
+};
+
+typedef BLE BLEDevice; /* DEPRECATED. This type alias is retained for the sake of compatibilty with older
+                        * code. Will be dropped at some point soon.*/
+
+/* BLE methods. Most of these simply forward the calls to the underlying
+ * transport.*/
+
+inline ble_error_t
+BLE::reset(void)
+{
+    return transport->reset();
+}
+
+inline ble_error_t
+BLE::shutdown(void)
+{
+    clearAdvertisingPayload();
+    return transport->shutdown();
+}
+
+inline ble_error_t
+BLE::setAddress(Gap::AddressType_t type, const Gap::Address_t address)
+{
+    return transport->getGap().setAddress(type, address);
+}
+
+inline ble_error_t
+BLE::getAddress(Gap::AddressType_t *typeP, Gap::Address_t address)
+{
+    return transport->getGap().getAddress(typeP, address);
+}
+
+inline void
+BLE::setAdvertisingType(GapAdvertisingParams::AdvertisingType advType)
+{
+    advParams.setAdvertisingType(advType);
+}
+
+inline void
+BLE::setAdvertisingInterval(uint16_t interval)
+{
+    if (interval == 0) {
+        stopAdvertising();
+    } else if (interval < getMinAdvertisingInterval()) {
+        interval = getMinAdvertisingInterval();
+    }
+    advParams.setInterval(Gap::MSEC_TO_ADVERTISEMENT_DURATION_UNITS(interval));
+}
+
+inline uint16_t
+BLE::getMinAdvertisingInterval(void) const {
+    return transport->getGap().getMinAdvertisingInterval();
+}
+
+inline uint16_t
+BLE::getMinNonConnectableAdvertisingInterval(void) const {
+    return transport->getGap().getMinNonConnectableAdvertisingInterval();
+}
+
+inline uint16_t
+BLE::getMaxAdvertisingInterval(void) const {
+    return transport->getGap().getMaxAdvertisingInterval();
+}
+
+inline void
+BLE::setAdvertisingTimeout(uint16_t timeout)
+{
+    advParams.setTimeout(timeout);
+}
+
+inline void
+BLE::setAdvertisingParams(const GapAdvertisingParams &newAdvParams)
+{
+    advParams = newAdvParams;
+}
+
+inline const GapAdvertisingParams &
+BLE::getAdvertisingParams(void) const
+{
+    return advParams;
+}
+
+inline void
+BLE::clearAdvertisingPayload(void)
+{
+    needToSetAdvPayload = true;
+    advPayload.clear();
+}
+
+inline ble_error_t
+BLE::accumulateAdvertisingPayload(uint8_t flags)
+{
+    needToSetAdvPayload = true;
+    return advPayload.addFlags(flags);
+}
+
+inline ble_error_t
+BLE::accumulateAdvertisingPayload(GapAdvertisingData::Appearance app)
+{
+    needToSetAdvPayload = true;
+    transport->getGap().setAppearance(app);
+    return advPayload.addAppearance(app);
+}
+
+inline ble_error_t
+BLE::accumulateAdvertisingPayloadTxPower(int8_t txPower)
+{
+    needToSetAdvPayload = true;
+    return advPayload.addTxPower(txPower);
+}
+
+inline ble_error_t
+BLE::accumulateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len)
+{
+    needToSetAdvPayload = true;
+    if (type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
+        transport->getGap().setDeviceName(data);
+    }
+    return advPayload.addData(type, data, len);
+}
+
+inline ble_error_t
+BLE::accumulateScanResponse(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len)
+{
+    needToSetAdvPayload = true;
+    return scanResponse.addData(type, data, len);
+}
+
+inline void
+BLE::clearScanResponse(void)
+{
+    needToSetAdvPayload = true;
+    scanResponse.clear();
+}
+
+inline ble_error_t
+BLE::setAdvertisingPayload(void) {
+    needToSetAdvPayload = false;
+    return transport->getGap().setAdvertisingData(advPayload, scanResponse);
+}
+
+inline ble_error_t
+BLE::setAdvertisingData(const GapAdvertisingData& newPayload)
+{
+    advPayload = newPayload;
+
+    return setAdvertisingPayload();
+}
+
+inline const GapAdvertisingData &
+BLE::getAdvertisingData(void) const {
+    return advPayload;
+}
+
+inline ble_error_t
+BLE::startAdvertising(void)
+{
+    ble_error_t rc;
+    if ((rc = transport->getGattServer().initializeGATTDatabase()) != BLE_ERROR_NONE) {
+        return rc;
+    }
+    if (needToSetAdvPayload) {
+        if ((rc = setAdvertisingPayload()) != BLE_ERROR_NONE) {
+            return rc;
+        }
+    }
+
+    return transport->getGap().startAdvertising(advParams);
+}
+
+inline ble_error_t
+BLE::stopAdvertising(void)
+{
+    return transport->getGap().stopAdvertising();
+}
+
+inline ble_error_t
+BLE::setScanParams(uint16_t interval, uint16_t window, uint16_t timeout, bool activeScanning) {
+    ble_error_t rc;
+    if (((rc = scanningParams.setInterval(interval)) == BLE_ERROR_NONE) &&
+        ((rc = scanningParams.setWindow(window))     == BLE_ERROR_NONE) &&
+        ((rc = scanningParams.setTimeout(timeout))   == BLE_ERROR_NONE)) {
+        scanningParams.setActiveScanning(activeScanning);
+        return BLE_ERROR_NONE;
+    }
+
+    return rc;
+}
+
+inline ble_error_t
+BLE::setScanInterval(uint16_t interval) {
+    return scanningParams.setInterval(interval);
+}
+
+inline ble_error_t
+BLE::setScanWindow(uint16_t window) {
+    return scanningParams.setWindow(window);
+}
+
+inline ble_error_t
+BLE::setScanTimeout(uint16_t timeout) {
+    return scanningParams.setTimeout(timeout);
+}
+
+inline void
+BLE::setActiveScan(bool activeScanning) {
+    return scanningParams.setActiveScanning(activeScanning);
+}
+
+inline ble_error_t
+BLE::startScan(void (*callback)(const Gap::AdvertisementCallbackParams_t *params)) {
+    return transport->getGap().startScan(scanningParams, callback);
+}
+
+template<typename T>
+inline ble_error_t
+BLE::startScan(T *object, void (T::*memberCallback)(const Gap::AdvertisementCallbackParams_t *params)) {
+    return transport->getGap().startScan(scanningParams, object, memberCallback);
+}
+
+inline ble_error_t
+BLE::stopScan(void) {
+    return transport->getGap().stopScan();
+}
+
+inline ble_error_t
+BLE::connect(const Gap::Address_t           peerAddr,
+             Gap::AddressType_t             peerAddrType,
+             const Gap::ConnectionParams_t *connectionParams,
+             const GapScanningParams       *scanParams) {
+    return transport->getGap().connect(peerAddr, peerAddrType, connectionParams, scanParams);
+}
+
+inline ble_error_t
+BLE::disconnect(Gap::DisconnectionReason_t reason)
+{
+    return transport->getGap().disconnect(reason);
+}
+
+inline void
+BLE::onTimeout(Gap::EventCallback_t timeoutCallback)
+{
+    transport->getGap().setOnTimeout(timeoutCallback);
+}
+
+inline void
+BLE::onConnection(Gap::ConnectionEventCallback_t connectionCallback)
+{
+    transport->getGap().setOnConnection(connectionCallback);
+}
+
+inline void
+BLE::onDisconnection(Gap::DisconnectionEventCallback_t disconnectionCallback)
+{
+    transport->getGap().setOnDisconnection(disconnectionCallback);
+}
+
+template<typename T>
+inline void
+BLE::addToDisconnectionCallChain(T *tptr, void (T::*mptr)(void)) {
+    transport->getGap().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)
+{
+    transport->getGap().setOnRadioNotification(callback);
+}
+
+inline ble_error_t
+BLE::addService(GattService &service)
+{
+    return transport->getGattServer().addService(service);
+}
+
+inline Gap::GapState_t
+BLE::getGapState(void) const
+{
+    return transport->getGap().getState();
+}
+
+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 void
+BLE::waitForEvent(void)
+{
+    transport->waitForEvent();
+}
+
+inline ble_error_t
+BLE::getPreferredConnectionParams(Gap::ConnectionParams_t *params)
+{
+    return transport->getGap().getPreferredConnectionParams(params);
+}
+
+inline ble_error_t
+BLE::setPreferredConnectionParams(const Gap::ConnectionParams_t *params)
+{
+    return transport->getGap().setPreferredConnectionParams(params);
+}
+
+inline ble_error_t
+BLE::updateConnectionParams(Gap::Handle_t handle, const Gap::ConnectionParams_t *params) {
+    return transport->getGap().updateConnectionParams(handle, params);
+}
+
+inline const char *
+BLE::getVersion(void)
+{
+    return transport->getVersion();
+}
+
+inline ble_error_t
+BLE::setDeviceName(const uint8_t *deviceName)
+{
+    return transport->getGap().setDeviceName(deviceName);
+}
+
+inline ble_error_t
+BLE::getDeviceName(uint8_t *deviceName, unsigned *lengthP)
+{
+    return transport->getGap().getDeviceName(deviceName, lengthP);
+}
+
+inline ble_error_t
+BLE::setAppearance(uint16_t appearance)
+{
+    return transport->getGap().setAppearance(appearance);
+}
+
+inline ble_error_t
+BLE::getAppearance(uint16_t *appearanceP)
+{
+    return transport->getGap().getAppearance(appearanceP);
+}
+
+inline ble_error_t
+BLE::setTxPower(int8_t txPower)
+{
+    return transport->getGap().setTxPower(txPower);
+}
+
+inline void
+BLE::getPermittedTxPowerValues(const int8_t **valueArrayPP, size_t *countP)
+{
+    transport->getGap().getPermittedTxPowerValues(valueArrayPP, countP);
+}
+
+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)
+{
+    transport->getGap().setOnSecuritySetupInitiated(callback);
+}
+
+inline void
+BLE::onSecuritySetupCompleted(Gap::SecuritySetupCompletedCallback_t callback)
+{
+    transport->getGap().setOnSecuritySetupCompleted(callback);
+}
+
+inline void
+BLE::onLinkSecured(Gap::LinkSecuredCallback_t callback)
+{
+    transport->getGap().setOnLinkSecured(callback);
+}
+
+inline void
+BLE::onSecurityContextStored(Gap::HandleSpecificEvent_t callback)
+{
+    transport->getGap().setOnSecurityContextStored(callback);
+}
+
+inline void
+BLE::onPasskeyDisplay(Gap::PasskeyDisplayCallback_t callback)
+{
+    return transport->getGap().setOnPasskeyDisplay(callback);
+}
+
+inline ble_error_t
+BLE::getLinkSecurity(Gap::Handle_t connectionHandle, Gap::LinkSecurityStatus_t *securityStatusP)
+{
+    return transport->getGap().getLinkSecurity(connectionHandle, securityStatusP);
+}
+
+inline ble_error_t
+BLE::purgeAllBondingState(void)
+{
+    return transport->getGap().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__
\ No newline at end of file