A thread safe GATT handler associated to one device via one L2CAP connection. More...

#include <BTGattHandler.hpp>

Collaboration diagram for direct_bt::BTGattHandler:

Public Types
enum	Defaults : int32_t { Defaults::MAX_ATT_MTU = 512, Defaults::MIN_ATT_MTU = 23 }

Public Member Functions
	BTGattHandler (const std::shared_ptr< BTDevice > &device, L2CAPComm &l2cap_att) noexcept
	Constructing a new BTGattHandler instance with its opened and connected L2CAP channel. More...

	BTGattHandler (const BTGattHandler &)=delete

void	operator= (const BTGattHandler &)=delete

	~BTGattHandler () noexcept
	Destructor closing this instance including L2CAP channel, see disconnect(). More...

std::shared_ptr< BTDevice >	getDeviceUnchecked () const noexcept

std::shared_ptr< BTDevice >	getDeviceChecked () const

bool	isConnected () const noexcept

bool	hasIOError () const noexcept

std::string	getStateString () const noexcept

bool	disconnect (const bool disconnectDevice, const bool ioErrorCause) noexcept
	Disconnect this BTGattHandler and optionally the associated device. More...

uint16_t	getServerMTU () const noexcept

uint16_t	getUsedMTU () const noexcept

BTGattCharRef	findCharacterisicsByValueHandle (const uint16_t charValueHandle) noexcept
	Find and return the BTGattChar within internal primary services via given characteristic value handle. More...

BTGattCharRef	findCharacterisicsByValueHandle (const uint16_t charValueHandle, jau::darray< BTGattServiceRef > &services) noexcept
	Find and return the BTGattChar within given list of primary services via given characteristic value handle. More...

BTGattCharRef	findCharacterisicsByValueHandle (const uint16_t charValueHandle, BTGattServiceRef service) noexcept
	Find and return the BTGattChar within given primary service via given characteristic value handle. More...

jau::darray< BTGattServiceRef > &	discoverCompletePrimaryServices (std::shared_ptr< BTGattHandler > shared_this)
	Discover all primary services and all its characteristics declarations including their client config. More...

jau::darray< BTGattServiceRef > &	getServices () noexcept
	Returns a reference of the internal kept BTGattService list. More...

std::shared_ptr< GattGenericAccessSvc >	getGenericAccess () noexcept
	Returns the internal kept shared GattGenericAccessSvc instance. More...

bool	discoverPrimaryServices (std::shared_ptr< BTGattHandler > shared_this, jau::darray< BTGattServiceRef > &result)
	Discover all primary services only. More...

bool	discoverCharacteristics (BTGattServiceRef &service)
	Discover all characteristics of a service and declaration attributes only. More...

bool	discoverDescriptors (BTGattServiceRef &service)
	BT Core Spec v5.2: Vol 3, Part G GATT: 4.7.1 Discover All Characteristic Descriptors. More...

bool	readValue (const uint16_t handle, POctets &res, int expectedLength=-1)
	Generic read GATT value and long value. More...

bool	readCharacteristicValue (const BTGattChar &c, POctets &res, int expectedLength=-1)
	BT Core Spec v5.2: Vol 3, Part G GATT: 4.8.1 Read Characteristic Value. More...

bool	readDescriptorValue (BTGattDesc &cd, int expectedLength=-1)
	BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.1 Read Characteristic Descriptor. More...

bool	writeValue (const uint16_t handle, const TROOctets &value, const bool withResponse)
	Generic write GATT value and long value. More...

bool	writeDescriptorValue (const BTGattDesc &cd)
	BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.3 Write Characteristic Descriptors. More...

bool	writeCharacteristicValue (const BTGattChar &c, const TROOctets &value)
	BT Core Spec v5.2: Vol 3, Part G GATT: 4.9.3 Write Characteristic Value. More...

bool	writeCharacteristicValueNoResp (const BTGattChar &c, const TROOctets &value)
	BT Core Spec v5.2: Vol 3, Part G GATT: 4.9.1 Write Characteristic Value Without Response. More...

bool	configNotificationIndication (BTGattDesc &cd, const bool enableNotification, const bool enableIndication)
	BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration. More...

bool	addCharListener (std::shared_ptr< BTGattCharListener > l)
	Add the given listener to the list if not already present. More...

bool	removeCharListener (std::shared_ptr< BTGattCharListener > l) noexcept
	Remove the given listener from the list. More...

bool	removeCharListener (const BTGattCharListener *l) noexcept
	Remove the given listener from the list. More...

int	removeAllAssociatedCharListener (std::shared_ptr< BTGattChar > associatedChar) noexcept
	Remove all BTGattCharListener from the list, which are associated to the given BTGattChar. More...

int	removeAllAssociatedCharListener (const BTGattChar *associatedChar) noexcept

int	removeAllCharListener () noexcept
	Remove all event listener from the list. More...

void	setSendIndicationConfirmation (const bool v)
	Enable or disable sending an immediate confirmation for received indication events from the device. More...

bool	getSendIndicationConfirmation () noexcept
	Returns whether sending an immediate confirmation for received indication events from the device is enabled. More...

std::shared_ptr< GattGenericAccessSvc >	getGenericAccess (jau::darray< BTGattServiceRef > &primServices)
	Higher level semantic functionality. More...

std::shared_ptr< GattGenericAccessSvc >	getGenericAccess (jau::darray< BTGattCharRef > &genericAccessCharDeclList)

std::shared_ptr< GattDeviceInformationSvc >	getDeviceInformation (jau::darray< BTGattServiceRef > &primServices)

std::shared_ptr< GattDeviceInformationSvc >	getDeviceInformation (jau::darray< BTGattCharRef > &deviceInfoCharDeclList)

bool	ping ()
	Issues a ping to the device, validating whether it is still reachable. More...

Static Public Member Functions
static constexpr int	number (const Defaults d)

Detailed Description

A thread safe GATT handler associated to one device via one L2CAP connection.

Implementation utilizes a lock free ringbuffer receiving data within its separate thread.

Controlling Environment variables, see BTGattEnv.

Definition at line 140 of file BTGattHandler.hpp.

Member Enumeration Documentation

◆ Defaults

enum direct_bt::BTGattHandler::Defaults : int32_t

strong

Enumerator
MAX_ATT_MTU
MIN_ATT_MTU

Definition at line 142 of file BTGattHandler.hpp.

Constructor & Destructor Documentation

◆ BTGattHandler() [1/2]

BTGattHandler::BTGattHandler	(	const std::shared_ptr< BTDevice > &	device,
		L2CAPComm &	l2cap_att
	)

noexcept

Constructing a new BTGattHandler instance with its opened and connected L2CAP channel.

After successful l2cap connection, the MTU will be exchanged. See getServerMTU() and getUsedMTU(), the latter is in use.

Definition at line 277 of file BTGattHandler.cpp.

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◆ BTGattHandler() [2/2]

direct_bt::BTGattHandler::BTGattHandler ( const BTGattHandler & )

delete

◆ ~BTGattHandler()

BTGattHandler::~BTGattHandler ( )

noexcept

Destructor closing this instance including L2CAP channel, see disconnect().

Definition at line 334 of file BTGattHandler.cpp.

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Member Function Documentation

◆ addCharListener()

bool BTGattHandler::addCharListener ( std::shared_ptr< BTGattCharListener > l )

Add the given listener to the list if not already present.

Returns true if the given listener is not element of the list and has been newly added, otherwise false.

Examples: dbt_scanner01.cpp.

Definition at line 105 of file BTGattHandler.cpp.

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◆ configNotificationIndication()

bool BTGattHandler::configNotificationIndication	(	BTGattDesc &	cd,
		const bool	enableNotification,
		const bool	enableIndication
	)

BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration.

Method enables notification and/or indication for the corresponding characteristic at BLE level.

It is recommended to utilize notification over indication, as its link-layer handshake and higher potential bandwidth may deliver material higher performance.

Throws an IllegalArgumentException if the given BTGattDesc is not a ClientCharacteristicConfiguration.

Examples: dbt_scanner01.cpp.

Definition at line 908 of file BTGattHandler.cpp.

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◆ disconnect()

bool BTGattHandler::disconnect	(	const bool	disconnectDevice,
		const bool	ioErrorCause
	)

noexcept

Disconnect this BTGattHandler and optionally the associated device.

Parameters

disconnectDevice	if true, associated device will also be disconnected, otherwise not.
ioErrorCause	if true, reason for disconnection is an IO error

Returns: true if successful, otherwise false

Definition at line 341 of file BTGattHandler.cpp.

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◆ discoverCharacteristics()

bool BTGattHandler::discoverCharacteristics ( BTGattServiceRef & service )

Discover all characteristics of a service and declaration attributes only.

BT Core Spec v5.2: Vol 3, Part G GATT: 4.6.1 Discover All Characteristics of a Service

BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.1 Characterisic Declaration Attribute Value

Definition at line 592 of file BTGattHandler.cpp.

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◆ discoverCompletePrimaryServices()

jau::darray< BTGattServiceRef > & BTGattHandler::discoverCompletePrimaryServices ( std::shared_ptr< BTGattHandler > shared_this )

Discover all primary services and all its characteristics declarations including their client config.

BT Core Spec v5.2: Vol 3, Part G GATT: 4.4.1 Discover All Primary Services

Method returns reference to BTGattHandler's internal BTGattService vector of discovered services

Parameters

shared_this shared pointer of this instance, used to forward a weak_ptr to BTGattService for back-reference. Reference is validated.

Returns: BTGattHandler's internal BTGattService vector of discovered services

Examples: dbt_scanner01.cpp.

Definition at line 513 of file BTGattHandler.cpp.

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◆ discoverDescriptors()

bool BTGattHandler::discoverDescriptors ( BTGattServiceRef & service )

BT Core Spec v5.2: Vol 3, Part G GATT: 4.7.1 Discover All Characteristic Descriptors.

Definition at line 657 of file BTGattHandler.cpp.

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◆ discoverPrimaryServices()

bool BTGattHandler::discoverPrimaryServices	(	std::shared_ptr< BTGattHandler >	shared_this,
		jau::darray< BTGattServiceRef > &	result
	)

Discover all primary services only.

BT Core Spec v5.2: Vol 3, Part G GATT: 4.4.1 Discover All Primary Services

Parameters

shared_this	shared pointer of this instance, used to forward a weak_ptr to BTGattService for back-reference. Reference is validated.
result	vector containing all discovered primary services

Returns: true on success, otherwise false

Definition at line 528 of file BTGattHandler.cpp.

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◆ findCharacterisicsByValueHandle() [1/3]

BTGattCharRef BTGattHandler::findCharacterisicsByValueHandle ( const uint16_t charValueHandle )

noexcept

Find and return the BTGattChar within internal primary services via given characteristic value handle.

Returns nullptr if not found.

Definition at line 489 of file BTGattHandler.cpp.

◆ findCharacterisicsByValueHandle() [2/3]

BTGattCharRef BTGattHandler::findCharacterisicsByValueHandle	(	const uint16_t	charValueHandle,
		BTGattServiceRef	service
	)

noexcept

Find and return the BTGattChar within given primary service via given characteristic value handle.

Returns nullptr if not found.

Definition at line 503 of file BTGattHandler.cpp.

◆ findCharacterisicsByValueHandle() [3/3]

BTGattCharRef BTGattHandler::findCharacterisicsByValueHandle	(	const uint16_t	charValueHandle,
		jau::darray< BTGattServiceRef > &	services
	)

noexcept

Find and return the BTGattChar within given list of primary services via given characteristic value handle.

Returns nullptr if not found.

Definition at line 493 of file BTGattHandler.cpp.

◆ getDeviceChecked()

std::shared_ptr< BTDevice > BTGattHandler::getDeviceChecked ( ) const

Definition at line 75 of file BTGattHandler.cpp.

◆ getDeviceInformation() [1/2]

std::shared_ptr< GattDeviceInformationSvc > BTGattHandler::getDeviceInformation ( jau::darray< BTGattCharRef > & deviceInfoCharDeclList )

Definition at line 1026 of file BTGattHandler.cpp.

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◆ getDeviceInformation() [2/2]

std::shared_ptr< GattDeviceInformationSvc > BTGattHandler::getDeviceInformation ( jau::darray< BTGattServiceRef > & primServices )

Examples: dbt_scanner00.cpp, dbt_scanner01.cpp, and dbt_scanner10.cpp.

Definition at line 1096 of file BTGattHandler.cpp.

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◆ getDeviceUnchecked()

std::shared_ptr<BTDevice> direct_bt::BTGattHandler::getDeviceUnchecked ( ) const

inlinenoexcept

Definition at line 250 of file BTGattHandler.hpp.

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◆ getGenericAccess() [1/3]

std::shared_ptr<GattGenericAccessSvc> direct_bt::BTGattHandler::getGenericAccess ( )

inlinenoexcept

Returns the internal kept shared GattGenericAccessSvc instance.

This instance is created via discoverCompletePrimaryServices().

Definition at line 322 of file BTGattHandler.hpp.

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◆ getGenericAccess() [2/3]

std::shared_ptr< GattGenericAccessSvc > BTGattHandler::getGenericAccess ( jau::darray< BTGattCharRef > & genericAccessCharDeclList )

Definition at line 951 of file BTGattHandler.cpp.

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◆ getGenericAccess() [3/3]

std::shared_ptr< GattGenericAccessSvc > BTGattHandler::getGenericAccess ( jau::darray< BTGattServiceRef > & primServices )

Higher level semantic functionality.

Definition at line 986 of file BTGattHandler.cpp.

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◆ getSendIndicationConfirmation()

bool BTGattHandler::getSendIndicationConfirmation ( )

noexcept

Returns whether sending an immediate confirmation for received indication events from the device is enabled.

Default value is true.

This setting is per BTGattHandler and hence per BTDevice.

Definition at line 176 of file BTGattHandler.cpp.

◆ getServerMTU()

uint16_t direct_bt::BTGattHandler::getServerMTU ( ) const

inlinenoexcept

Examples: dbt_scanner01.cpp.

Definition at line 265 of file BTGattHandler.hpp.

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◆ getServices()

jau::darray<BTGattServiceRef>& direct_bt::BTGattHandler::getServices ( )

inlinenoexcept

Returns a reference of the internal kept BTGattService list.

The internal list will be populated via discoverCompletePrimaryServices().

Definition at line 314 of file BTGattHandler.hpp.

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◆ getStateString()

std::string direct_bt::BTGattHandler::getStateString ( ) const

inlinenoexcept

Examples: dbt_scanner01.cpp.

Definition at line 255 of file BTGattHandler.hpp.

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◆ getUsedMTU()

uint16_t direct_bt::BTGattHandler::getUsedMTU ( ) const

inlinenoexcept

Examples: dbt_scanner01.cpp.

Definition at line 266 of file BTGattHandler.hpp.

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◆ hasIOError()

bool direct_bt::BTGattHandler::hasIOError ( ) const

inlinenoexcept

Definition at line 254 of file BTGattHandler.hpp.

◆ isConnected()

bool direct_bt::BTGattHandler::isConnected ( ) const

inlinenoexcept

Examples: dbt_scanner00.cpp, dbt_scanner01.cpp, and dbt_scanner10.cpp.

Definition at line 253 of file BTGattHandler.hpp.

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◆ number()

static constexpr int direct_bt::BTGattHandler::number ( const Defaults d )

inlinestaticconstexpr

Examples: dbt_scanner00.cpp, dbt_scanner01.cpp, and dbt_scanner10.cpp.

Definition at line 149 of file BTGattHandler.hpp.

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◆ operator=()

void direct_bt::BTGattHandler::operator= ( const BTGattHandler & )

delete

◆ ping()

bool BTGattHandler::ping ( )

Issues a ping to the device, validating whether it is still reachable.

This method could be periodically utilized to shorten the underlying OS disconnect period after turning the device off, which lies within 7-13s.

In case the device is no more reachable, disconnect will be initiated due to the occurring IO error.

Returns: true if successful, otherwise false in case no GATT services exists etc.

Definition at line 994 of file BTGattHandler.cpp.

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◆ readCharacteristicValue()

bool BTGattHandler::readCharacteristicValue	(	const BTGattChar &	c,
		POctets &	res,
		int	expectedLength = `-1`
	)

BT Core Spec v5.2: Vol 3, Part G GATT: 4.8.1 Read Characteristic Value.

BT Core Spec v5.2: Vol 3, Part G GATT: 4.8.3 Read Long Characteristic Value

If expectedLength = 0, then only one ATT_READ_REQ/RSP will be used.

If expectedLength < 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used until the response returns zero. This is the default parameter.

If expectedLength > 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used if required until the response returns zero.

Examples: dbt_scanner01.cpp.

Definition at line 753 of file BTGattHandler.cpp.

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◆ readDescriptorValue()

bool BTGattHandler::readDescriptorValue	(	BTGattDesc &	cd,
		int	expectedLength = `-1`
	)

BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.1 Read Characteristic Descriptor.

BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.2 Read Long Characteristic Descriptor

If expectedLength = 0, then only one ATT_READ_REQ/RSP will be used.

If expectedLength < 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used until the response returns zero. This is the default parameter.

If expectedLength > 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used if required until the response returns zero.

Definition at line 743 of file BTGattHandler.cpp.

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◆ readValue()

bool BTGattHandler::readValue	(	const uint16_t	handle,
		POctets &	res,
		int	expectedLength = `-1`
	)

Generic read GATT value and long value.

If expectedLength = 0, then only one ATT_READ_REQ/RSP will be used.

If expectedLength < 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used until the response returns zero. This is the default parameter.

If expectedLength > 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used if required until the response returns zero.

Definition at line 762 of file BTGattHandler.cpp.

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◆ removeAllAssociatedCharListener() [1/2]

int BTGattHandler::removeAllAssociatedCharListener ( const BTGattChar * associatedChar )

noexcept

Definition at line 145 of file BTGattHandler.cpp.

◆ removeAllAssociatedCharListener() [2/2]

int BTGattHandler::removeAllAssociatedCharListener ( std::shared_ptr< BTGattChar > associatedChar )

noexcept

Remove all BTGattCharListener from the list, which are associated to the given BTGattChar.

Implementation tests all listener's BTGattCharListener::match(const BTGattChar & characteristic) to match with the given associated characteristic.

Parameters

associatedCharacteristic the match criteria to remove any BTGattCharListener from the list

Returns: number of removed listener.

Definition at line 137 of file BTGattHandler.cpp.

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◆ removeAllCharListener()

int BTGattHandler::removeAllCharListener ( )

noexcept

Remove all event listener from the list.

Returns the number of removed event listener.

Definition at line 166 of file BTGattHandler.cpp.

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◆ removeCharListener() [1/2]

bool BTGattHandler::removeCharListener ( const BTGattCharListener * l )

noexcept

Remove the given listener from the list.

Returns true if the given listener is an element of the list and has been removed, otherwise false.

Definition at line 121 of file BTGattHandler.cpp.

◆ removeCharListener() [2/2]

bool BTGattHandler::removeCharListener ( std::shared_ptr< BTGattCharListener > l )

noexcept

Remove the given listener from the list.

Returns true if the given listener is an element of the list and has been removed, otherwise false.

Definition at line 112 of file BTGattHandler.cpp.

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◆ setSendIndicationConfirmation()

void BTGattHandler::setSendIndicationConfirmation ( const bool v )

Enable or disable sending an immediate confirmation for received indication events from the device.

Default value is true.

This setting is per BTGattHandler and hence per BTDevice.

Definition at line 172 of file BTGattHandler.cpp.

◆ writeCharacteristicValue()

bool BTGattHandler::writeCharacteristicValue	(	const BTGattChar &	c,
		const TROOctets &	value
	)

BT Core Spec v5.2: Vol 3, Part G GATT: 4.9.3 Write Characteristic Value.

Definition at line 849 of file BTGattHandler.cpp.

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◆ writeCharacteristicValueNoResp()

bool BTGattHandler::writeCharacteristicValueNoResp	(	const BTGattChar &	c,
		const TROOctets &	value
	)

BT Core Spec v5.2: Vol 3, Part G GATT: 4.9.1 Write Characteristic Value Without Response.

Definition at line 859 of file BTGattHandler.cpp.

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◆ writeDescriptorValue()

bool BTGattHandler::writeDescriptorValue ( const BTGattDesc & cd )

BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.3 Write Characteristic Descriptors.

BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3 Characteristic Descriptor

BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration

Definition at line 835 of file BTGattHandler.cpp.

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◆ writeValue()

bool BTGattHandler::writeValue	(	const uint16_t	handle,
		const TROOctets &	value,
		const bool	withResponse
	)

Generic write GATT value and long value.

Definition at line 865 of file BTGattHandler.cpp.

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The documentation for this class was generated from the following files:

/usr/local/projects/direct_bt/api/direct_bt/BTGattHandler.hpp
/usr/local/projects/direct_bt/src/direct_bt/BTGattHandler.cpp

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Defaults

Constructor & Destructor Documentation

◆ BTGattHandler() [1/2]

◆ BTGattHandler() [2/2]

◆ ~BTGattHandler()

Member Function Documentation

◆ addCharListener()

◆ configNotificationIndication()

◆ disconnect()

◆ discoverCharacteristics()

◆ discoverCompletePrimaryServices()

◆ discoverDescriptors()

◆ discoverPrimaryServices()

◆ findCharacterisicsByValueHandle() [1/3]

◆ findCharacterisicsByValueHandle() [2/3]

◆ findCharacterisicsByValueHandle() [3/3]

◆ getDeviceChecked()

◆ getDeviceInformation() [1/2]

◆ getDeviceInformation() [2/2]

◆ getDeviceUnchecked()

◆ getGenericAccess() [1/3]

◆ getGenericAccess() [2/3]

◆ getGenericAccess() [3/3]

◆ getSendIndicationConfirmation()

◆ getServerMTU()

◆ getServices()

◆ getStateString()

◆ getUsedMTU()

◆ hasIOError()

◆ isConnected()

◆ number()

◆ operator=()

◆ ping()

◆ readCharacteristicValue()

◆ readDescriptorValue()

◆ readValue()

◆ removeAllAssociatedCharListener() [1/2]

◆ removeAllAssociatedCharListener() [2/2]

◆ removeAllCharListener()

◆ removeCharListener() [1/2]

◆ removeCharListener() [2/2]

◆ setSendIndicationConfirmation()

◆ writeCharacteristicValue()

◆ writeCharacteristicValueNoResp()

◆ writeDescriptorValue()

◆ writeValue()