Schoumi
/
BLE_API
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
BLE_API/ble/Gap.h

1068 lines
42 KiB
C++
Raw Permalink Blame History

/* 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 __GAP_H__
#define __GAP_H__
#include "GapAdvertisingData.h"
#include "GapAdvertisingParams.h"
#include "GapScanningParams.h"
#include "GapEvents.h"
#include "CallChainOfFunctionPointersWithContext.h"
#include "FunctionPointerWithContext.h"
/* Forward declarations for classes that will only be used for pointers or references in the following. */
class GapAdvertisingParams;
class GapScanningParams;
class GapAdvertisingData;
class Gap {
public:
enum AddressType_t {
ADDR_TYPE_PUBLIC = 0,
ADDR_TYPE_RANDOM_STATIC,
ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE,
ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE
};
typedef enum AddressType_t addr_type_t; /* @Note: Deprecated. Use AddressType_t instead. */
static const unsigned ADDR_LEN = 6;
typedef uint8_t Address_t[ADDR_LEN]; /* 48-bit address, LSB format. */
typedef Address_t address_t; /* @Note: Deprecated. Use Address_t instead. */
enum TimeoutSource_t {
TIMEOUT_SRC_ADVERTISING = 0x00, /**< Advertising timeout. */
TIMEOUT_SRC_SECURITY_REQUEST = 0x01, /**< Security request timeout. */
TIMEOUT_SRC_SCAN = 0x02, /**< Scanning timeout. */
TIMEOUT_SRC_CONN = 0x03, /**< Connection timeout. */
};
/**
* Enumeration for disconnection reasons. The values for these reasons are
* derived from Nordic's implementation, but the reasons are meant to be
* independent of the transport. If you are returned a reason that is not
* covered by this enumeration, please refer to the underlying
* transport library.
*/
enum DisconnectionReason_t {
CONNECTION_TIMEOUT = 0x08,
REMOTE_USER_TERMINATED_CONNECTION = 0x13,
REMOTE_DEV_TERMINATION_DUE_TO_LOW_RESOURCES = 0x14, /**< Remote device terminated connection due to low resources.*/
REMOTE_DEV_TERMINATION_DUE_TO_POWER_OFF = 0x15, /**< Remote device terminated connection due to power off. */
LOCAL_HOST_TERMINATED_CONNECTION = 0x16,
CONN_INTERVAL_UNACCEPTABLE = 0x3B,
};
/* Describes the current state of the device (more than one bit can be set). */
struct GapState_t {
unsigned advertising : 1; /**< Peripheral is currently advertising. */
unsigned connected : 1; /**< Peripheral is connected to a central. */
};
typedef uint16_t Handle_t; /* Type for connection handle. */
typedef struct {
uint16_t minConnectionInterval; /**< Minimum Connection Interval in 1.25 ms units, see @ref BLE_GAP_CP_LIMITS.*/
uint16_t maxConnectionInterval; /**< Maximum Connection Interval in 1.25 ms units, see @ref BLE_GAP_CP_LIMITS.*/
uint16_t slaveLatency; /**< Slave Latency in number of connection events, see @ref BLE_GAP_CP_LIMITS.*/
uint16_t connectionSupervisionTimeout; /**< Connection Supervision Timeout in 10 ms units, see @ref BLE_GAP_CP_LIMITS.*/
} ConnectionParams_t;
enum Role_t {
PERIPHERAL = 0x1, /**< Peripheral Role. */
CENTRAL = 0x2, /**< Central Role. */
};
struct AdvertisementCallbackParams_t {
Address_t peerAddr;
int8_t rssi;
bool isScanResponse;
GapAdvertisingParams::AdvertisingType_t type;
uint8_t advertisingDataLen;
const uint8_t *advertisingData;
};
typedef FunctionPointerWithContext<const AdvertisementCallbackParams_t *> AdvertisementReportCallback_t;
struct ConnectionCallbackParams_t {
Handle_t handle;
Role_t role;
AddressType_t peerAddrType;
Address_t peerAddr;
AddressType_t ownAddrType;
Address_t ownAddr;
const ConnectionParams_t *connectionParams;
ConnectionCallbackParams_t(Handle_t handleIn,
Role_t roleIn,
AddressType_t peerAddrTypeIn,
const uint8_t *peerAddrIn,
AddressType_t ownAddrTypeIn,
const uint8_t *ownAddrIn,
const ConnectionParams_t *connectionParamsIn) :
handle(handleIn),
role(roleIn),
peerAddrType(peerAddrTypeIn),
peerAddr(),
ownAddrType(ownAddrTypeIn),
ownAddr(),
connectionParams(connectionParamsIn) {
memcpy(peerAddr, peerAddrIn, ADDR_LEN);
memcpy(ownAddr, ownAddrIn, ADDR_LEN);
}
};
struct DisconnectionCallbackParams_t {
Handle_t handle;
DisconnectionReason_t reason;
DisconnectionCallbackParams_t(Handle_t handleIn,
DisconnectionReason_t reasonIn) :
handle(handleIn),
reason(reasonIn)
{}
};
static const uint16_t UNIT_1_25_MS = 1250; /**< Number of microseconds in 1.25 milliseconds. */
static uint16_t MSEC_TO_GAP_DURATION_UNITS(uint32_t durationInMillis) {
return (durationInMillis * 1000) / UNIT_1_25_MS;
}
typedef FunctionPointerWithContext<TimeoutSource_t> TimeoutEventCallback_t;
typedef CallChainOfFunctionPointersWithContext<TimeoutSource_t> TimeoutEventCallbackChain_t;
typedef FunctionPointerWithContext<const ConnectionCallbackParams_t *> ConnectionEventCallback_t;
typedef CallChainOfFunctionPointersWithContext<const ConnectionCallbackParams_t *> ConnectionEventCallbackChain_t;
typedef FunctionPointerWithContext<const DisconnectionCallbackParams_t*> DisconnectionEventCallback_t;
typedef CallChainOfFunctionPointersWithContext<const DisconnectionCallbackParams_t*> DisconnectionEventCallbackChain_t;
typedef FunctionPointerWithContext<bool> RadioNotificationEventCallback_t;
/*
* The following functions are meant to be overridden in the platform-specific sub-class.
*/
public:
/**
* Set the BTLE MAC address and type. Please note that the address format is
* least significant byte first (LSB). Please refer to Address_t.
*
* @return BLE_ERROR_NONE on success.
*/
virtual ble_error_t setAddress(AddressType_t type, const Address_t address) {
/* avoid compiler warnings about unused variables */
(void)type;
(void)address;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* Fetch the BTLE MAC address and type.
*
* @return BLE_ERROR_NONE on success.
*/
virtual ble_error_t getAddress(AddressType_t *typeP, Address_t address) {
/* Avoid compiler warnings about unused variables. */
(void)typeP;
(void)address;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* @return Minimum Advertising interval in milliseconds for connectable
* undirected and connectable directed event types.
*/
virtual uint16_t getMinAdvertisingInterval(void) const {
return 0; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* @return Minimum Advertising interval in milliseconds for scannable
* undirected and non-connectable undirected event types.
*/
virtual uint16_t getMinNonConnectableAdvertisingInterval(void) const {
return 0; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* @return Maximum Advertising interval in milliseconds.
*/
virtual uint16_t getMaxAdvertisingInterval(void) const {
return 0xFFFF; /* Requesting action from porter(s): override this API if this capability is supported. */
}
virtual ble_error_t stopAdvertising(void) {
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* Stop scanning. The current scanning parameters remain in effect.
*
* @retval BLE_ERROR_NONE if successfully stopped scanning procedure.
*/
virtual ble_error_t stopScan() {
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* 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 connectionCallChain (if set) will be invoked upon
* a connection event.
*/
virtual ble_error_t connect(const Address_t peerAddr,
Gap::AddressType_t peerAddrType,
const ConnectionParams_t *connectionParams,
const GapScanningParams *scanParams) {
/* Avoid compiler warnings about unused variables. */
(void)peerAddr;
(void)peerAddrType;
(void)connectionParams;
(void)scanParams;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* This call initiates the disconnection procedure, and its completion will
* be communicated to the application with an invocation of the
* disconnectionCallback.
*
* @param reason
* The reason for disconnection; to be sent back to the peer.
*/
virtual ble_error_t disconnect(Handle_t connectionHandle, DisconnectionReason_t reason) {
/* avoid compiler warnings about unused variables */
(void)connectionHandle;
(void)reason;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* This call initiates the disconnection procedure, and its completion will
* be communicated to the application with an invocation of the
* disconnectionCallback.
*
* @param reason
* The reason for disconnection; to be sent back to the peer.
*
* @note: This version of disconnect() doesn't take a connection handle. It
* works reliably only for stacks that are limited to a single
* connection. This API should be considered *deprecated* in favour of the
* alternative, which takes a connection handle. It will be dropped in the future.
*/
virtual ble_error_t disconnect(DisconnectionReason_t reason) {
/* Avoid compiler warnings about unused variables. */
(void)reason;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* 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.
*/
virtual ble_error_t getPreferredConnectionParams(ConnectionParams_t *params) {
/* Avoid compiler warnings about unused variables. */
(void)params;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* 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.
*/
virtual ble_error_t setPreferredConnectionParams(const ConnectionParams_t *params) {
/* Avoid compiler warnings about unused variables. */
(void)params;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* Update connection parameters.
* In the central role this will initiate a Link Layer connection parameter update procedure.
* In the peripheral role, this will send the corresponding L2CAP request 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.
*/
virtual ble_error_t updateConnectionParams(Handle_t handle, const ConnectionParams_t *params) {
/* avoid compiler warnings about unused variables */
(void)handle;
(void)params;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* 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.
*/
virtual ble_error_t setDeviceName(const uint8_t *deviceName) {
/* Avoid compiler warnings about unused variables. */
(void)deviceName;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* 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.
*/
virtual ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP) {
/* avoid compiler warnings about unused variables */
(void)deviceName;
(void)lengthP;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* Set the appearance characteristic in the GAP service.
* @param[in] appearance
* The new value for the device-appearance.
*/
virtual ble_error_t setAppearance(GapAdvertisingData::Appearance appearance) {
/* Avoid compiler warnings about unused variables. */
(void)appearance;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* Get the appearance characteristic in the GAP service.
* @param[out] appearance
* The new value for the device-appearance.
*/
virtual ble_error_t getAppearance(GapAdvertisingData::Appearance *appearanceP) {
/* Avoid compiler warnings about unused variables. */
(void)appearanceP;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* Set the radio's transmit power.
* @param[in] txPower Radio transmit power in dBm.
*/
virtual ble_error_t setTxPower(int8_t txPower) {
/* Avoid compiler warnings about unused variables. */
(void)txPower;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/**
* 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.
*/
virtual void getPermittedTxPowerValues(const int8_t **valueArrayPP, size_t *countP) {
/* Avoid compiler warnings about unused variables. */
(void)valueArrayPP;
(void)countP;
*countP = 0; /* Requesting action from porter(s): override this API if this capability is supported. */
}
protected:
/* Override the following in the underlying adaptation layer to provide the functionality of scanning. */
virtual ble_error_t startRadioScan(const GapScanningParams &scanningParams) {
(void)scanningParams;
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
/*
* APIs with non-virtual implementations.
*/
public:
/**
* Returns the current GAP state of the device using a bitmask that
* describes whether the device is advertising or connected.
*/
GapState_t getState(void) const {
return state;
}
/**
* Set the GAP advertising mode to use for this device.
*/
void setAdvertisingType(GapAdvertisingParams::AdvertisingType_t advType) {
_advParams.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: [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 needs to be updated accordingly.
*/
void setAdvertisingInterval(uint16_t interval) {
if (interval == 0) {
stopAdvertising();
} else if (interval < getMinAdvertisingInterval()) {
interval = getMinAdvertisingInterval();
}
_advParams.setInterval(interval);
}
/**
* @param[in] timeout
* Advertising timeout (in seconds) between 0x1 and 0x3FFF (1
* and 16383). Use 0 to disable the advertising timeout.
*/
void setAdvertisingTimeout(uint16_t timeout) {
_advParams.setTimeout(timeout);
}
/**
* Start advertising.
*/
ble_error_t startAdvertising(void) {
setAdvertisingData(); /* Update the underlying stack. */
return startAdvertising(_advParams);
}
/**
* Reset any advertising payload prepared from prior calls to
* accumulateAdvertisingPayload(). This automatically propagates the re-
* initialized advertising payload to the underlying stack.
*/
void clearAdvertisingPayload(void) {
_advPayload.clear();
setAdvertisingData();
}
/**
* 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 is 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.
*/
ble_error_t accumulateAdvertisingPayload(uint8_t flags) {
ble_error_t rc;
if ((rc = _advPayload.addFlags(flags)) != BLE_ERROR_NONE) {
return rc;
}
return setAdvertisingData();
}
/**
* 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 is too
* small.
*
* @param app
* The appearance of the peripheral.
*/
ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::Appearance app) {
setAppearance(app);
ble_error_t rc;
if ((rc = _advPayload.addAppearance(app)) != BLE_ERROR_NONE) {
return rc;
}
return setAdvertisingData();
}
/**
* 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 is too
* small.
*
* @param power
* The max transmit power to be used by the controller (in dBm).
*/
ble_error_t accumulateAdvertisingPayloadTxPower(int8_t power) {
ble_error_t rc;
if ((rc = _advPayload.addTxPower(power)) != BLE_ERROR_NONE) {
return rc;
}
return setAdvertisingData();
}
/**
* 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 is too small.
*
* @param type The type describing 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) {
if (type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
setDeviceName(data);
}
ble_error_t rc;
if ((rc = _advPayload.addData(type, data, len)) != BLE_ERROR_NONE) {
return rc;
}
return setAdvertisingData();
}
/**
* Update a particular ADV field in the advertising payload (based on
* matching type and length). Note: the length of the new data must be the
* same as the old one.
*
* @param[in] type The ADV type field describing the variable length data.
* @param[in] data Data bytes.
* @param[in] len Length of data.
*
* @note: If advertisements are enabled, then the update will take effect immediately.
*
* @return BLE_ERROR_NONE if the advertisement payload was updated based on
* a <type, len> match; otherwise, an appropriate error.
*/
ble_error_t updateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len) {
if (type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
setDeviceName(data);
}
ble_error_t rc;
if ((rc = _advPayload.updateData(type, data, len)) != BLE_ERROR_NONE) {
return rc;
}
return setAdvertisingData();
}
/**
* Set up 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).
*/
ble_error_t setAdvertisingPayload(const GapAdvertisingData &payload) {
_advPayload = payload;
return setAdvertisingData();
}
/**
* @return Read back advertising data. Useful for storing and
* restoring payload.
*/
const GapAdvertisingData &getAdvertisingPayload(void) const {
return _advPayload;
}
/**
* Accumulate a variable length byte-stream as an AD structure in the
* scanResponse payload.
*
* @param[in] type The type describing the variable length data.
* @param[in] data Data bytes.
* @param[in] len Length of data.
*/
ble_error_t accumulateScanResponse(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len) {
ble_error_t rc;
if ((rc = _scanResponse.addData(type, data, len)) != BLE_ERROR_NONE) {
return rc;
}
return setAdvertisingData();
}
/**
* 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) {
_scanResponse.clear();
setAdvertisingData();
}
/**
* Set up parameters for GAP scanning (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 the 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.
*/
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 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;
}
/**
* Set up the scanInterval parameter for GAP scanning (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().
*/
ble_error_t setScanInterval(uint16_t interval) {
return _scanningParams.setInterval(interval);
}
/**
* Set up the scanWindow parameter for GAP scanning (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().
*
* If scanning is already active, the updated value of scanWindow will be
* propagated to the underlying BLE stack.
*/
ble_error_t setScanWindow(uint16_t window) {
ble_error_t rc;
if ((rc = _scanningParams.setWindow(window)) != BLE_ERROR_NONE) {
return rc;
}
/* If scanning is already active, propagate the new setting to the stack. */
if (scanningActive) {
return startRadioScan(_scanningParams);
}
return BLE_ERROR_NONE;
}
/**
* Set up parameters for GAP scanning (observer mode).
* @param[in] timeout
* Scan timeout (in seconds) between 0x0001 and 0xFFFF; 0x0000 disables the timeout.
*
* Once the scanning parameters have been configured, scanning can be
* enabled by using startScan().
*
* If scanning is already active, the updated value of scanTimeout will be
* propagated to the underlying BLE stack.
*/
ble_error_t setScanTimeout(uint16_t timeout) {
ble_error_t rc;
if ((rc = _scanningParams.setTimeout(timeout)) != BLE_ERROR_NONE) {
return rc;
}
/* If scanning is already active, propagate the new settings to the stack. */
if (scanningActive) {
return startRadioScan(_scanningParams);
}
return BLE_ERROR_NONE;
}
/**
* Set up parameters for GAP scanning (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().
*
* If scanning is already in progress, then active-scanning will be enabled
* for the underlying BLE stack.
*/
ble_error_t setActiveScanning(bool activeScanning) {
_scanningParams.setActiveScanning(activeScanning);
/* If scanning is already active, propagate the new settings to the stack. */
if (scanningActive) {
return startRadioScan(_scanningParams);
}
return BLE_ERROR_NONE;
}
/**
* 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.
*/
ble_error_t startScan(void (*callback)(const AdvertisementCallbackParams_t *params)) {
ble_error_t err = BLE_ERROR_NONE;
if (callback) {
if ((err = startRadioScan(_scanningParams)) == BLE_ERROR_NONE) {
scanningActive = true;
onAdvertisementReport.attach(callback);
}
}
return err;
}
/**
* Same as above, but this takes an (object, method) pair for a callback.
*/
template<typename T>
ble_error_t startScan(T *object, void (T::*callbackMember)(const AdvertisementCallbackParams_t *params)) {
ble_error_t err = BLE_ERROR_NONE;
if (object && callbackMember) {
if ((err = startRadioScan(_scanningParams)) == BLE_ERROR_NONE) {
scanningActive = true;
onAdvertisementReport.attach(object, callbackMember);
}
}
return err;
}
/**
* Initialize radio-notification events to be generated from the stack.
* This API doesn't need to be called directly.
*
* 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 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.
*
* @return BLE_ERROR_NONE on successful initialization, otherwise an error code.
*/
virtual ble_error_t initRadioNotification(void) {
return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
}
private:
ble_error_t setAdvertisingData(void) {
return setAdvertisingData(_advPayload, _scanResponse);
}
private:
virtual ble_error_t setAdvertisingData(const GapAdvertisingData &advData, const GapAdvertisingData &scanResponse) = 0;
virtual ble_error_t startAdvertising(const GapAdvertisingParams &) = 0;
public:
/**
* Accessors to read back currently active advertising params.
*/
GapAdvertisingParams &getAdvertisingParams(void) {
return _advParams;
}
const GapAdvertisingParams &getAdvertisingParams(void) const {
return _advParams;
}
/**
* Set up 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.
*/
void setAdvertisingParams(const GapAdvertisingParams &newParams) {
_advParams = newParams;
}
/* Event callback handlers. */
public:
/**
* Set up a callback for timeout events. Refer to TimeoutSource_t for
* possible event types.
* @note It is possible to unregister callbacks using onTimeout().detach(callback)
*/
void onTimeout(TimeoutEventCallback_t callback) {
timeoutCallbackChain.add(callback);
}
/**
* @brief provide access to the callchain of timeout event callbacks
* It is possible to register callbacks using onTimeout().add(callback);
* It is possible to unregister callbacks using onTimeout().detach(callback)
* @return The timeout event callbacks chain
*/
TimeoutEventCallbackChain_t& onTimeout() {
return timeoutCallbackChain;
}
/**
* Append to a chain of callbacks to be invoked upon GAP connection.
* @note It is possible to unregister callbacks using onConnection().detach(callback)
*/
void onConnection(ConnectionEventCallback_t callback) {connectionCallChain.add(callback);}
template<typename T>
void onConnection(T *tptr, void (T::*mptr)(const ConnectionCallbackParams_t*)) {connectionCallChain.add(tptr, mptr);}
/**
* @brief provide access to the callchain of connection event callbacks
* It is possible to register callbacks using onConnection().add(callback);
* It is possible to unregister callbacks using onConnection().detach(callback)
* @return The connection event callbacks chain
*/
ConnectionEventCallbackChain_t& onConnection() {
return connectionCallChain;
}
/**
* Append to a chain of callbacks to be invoked upon GAP disconnection.
* @note It is possible to unregister callbacks using onDisconnection().detach(callback)
*/
void onDisconnection(DisconnectionEventCallback_t callback) {disconnectionCallChain.add(callback);}
template<typename T>
void onDisconnection(T *tptr, void (T::*mptr)(const DisconnectionCallbackParams_t*)) {disconnectionCallChain.add(tptr, mptr);}
/**
* @brief provide access to the callchain of disconnection event callbacks
* It is possible to register callbacks using onDisconnection().add(callback);
* It is possible to unregister callbacks using onDisconnection().detach(callback)
* @return The disconnection event callbacks chain
*/
DisconnectionEventCallbackChain_t& onDisconnection() {
return disconnectionCallChain;
}
/**
* Set the application callback for radio-notification events.
*
* 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 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.
*
* Or in the other version:
*
* @param tptr
* Pointer to the object of a class defining the member callback
* function (mptr).
* @param mptr
* The member callback (within the context of an object) to be
* invoked in response to a radio ACTIVE/INACTIVE event.
*/
void onRadioNotification(void (*callback)(bool param)) {
radioNotificationCallback.attach(callback);
}
template <typename T>
void onRadioNotification(T *tptr, void (T::*mptr)(bool)) {
radioNotificationCallback.attach(tptr, mptr);
}
protected:
Gap() :
_advParams(),
_advPayload(),
_scanningParams(),
_scanResponse(),
state(),
scanningActive(false),
timeoutCallbackChain(),
radioNotificationCallback(),
onAdvertisementReport(),
connectionCallChain(),
disconnectionCallChain() {
_advPayload.clear();
_scanResponse.clear();
}
/* Entry points for the underlying stack to report events back to the user. */
public:
void processConnectionEvent(Handle_t handle,
Role_t role,
AddressType_t peerAddrType,
const Address_t peerAddr,
AddressType_t ownAddrType,
const Address_t ownAddr,
const ConnectionParams_t *connectionParams) {
state.connected = 1;
ConnectionCallbackParams_t callbackParams(handle, role, peerAddrType, peerAddr, ownAddrType, ownAddr, connectionParams);
connectionCallChain.call(&callbackParams);
}
void processDisconnectionEvent(Handle_t handle, DisconnectionReason_t reason) {
state.connected = 0;
DisconnectionCallbackParams_t callbackParams(handle, reason);
disconnectionCallChain.call(&callbackParams);
}
void processAdvertisementReport(const Address_t peerAddr,
int8_t rssi,
bool isScanResponse,
GapAdvertisingParams::AdvertisingType_t type,
uint8_t advertisingDataLen,
const uint8_t *advertisingData) {
AdvertisementCallbackParams_t params;
memcpy(params.peerAddr, peerAddr, ADDR_LEN);
params.rssi = rssi;
params.isScanResponse = isScanResponse;
params.type = type;
params.advertisingDataLen = advertisingDataLen;
params.advertisingData = advertisingData;
onAdvertisementReport.call(&params);
}
void processTimeoutEvent(TimeoutSource_t source) {
if (timeoutCallbackChain) {
timeoutCallbackChain(source);
}
}
protected:
GapAdvertisingParams _advParams;
GapAdvertisingData _advPayload;
GapScanningParams _scanningParams;
GapAdvertisingData _scanResponse;
GapState_t state;
bool scanningActive;
protected:
TimeoutEventCallbackChain_t timeoutCallbackChain;
RadioNotificationEventCallback_t radioNotificationCallback;
AdvertisementReportCallback_t onAdvertisementReport;
ConnectionEventCallbackChain_t connectionCallChain;
DisconnectionEventCallbackChain_t disconnectionCallChain;
private:
/* Disallow copy and assignment. */
Gap(const Gap &);
Gap& operator=(const Gap &);
};
#endif // ifndef __GAP_H__
Reference in New Issue View Git Blame Copy Permalink