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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef GATT_DESCRIPTOR_HPP_
#define GATT_DESCRIPTOR_HPP_
#include <cstring>
#include <string>
#include <memory>
#include <cstdint>
#include <vector>
#include <mutex>
#include <atomic>
#include "UUID.hpp"
#include "BTTypes.hpp"
#include "OctetTypes.hpp"
#include "ATTPDUTypes.hpp"
#include "DBTTypes.hpp"
/**
* - - - - - - - - - - - - - - -
*
* Module GATTDescriptor:
*
* - BT Core Spec v5.2: Vol 3, Part G Generic Attribute Protocol (GATT)
* - BT Core Spec v5.2: Vol 3, Part G GATT: 2.6 GATT Profile Hierarchy
*/
namespace direct_bt {
class DBTDevice; // forward
class GATTCharacteristic; // forward
typedef std::shared_ptr<GATTCharacteristic> GATTCharacteristicRef;
/**
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3 Characteristic Descriptor
*/
class GATTDescriptor : public DBTObject {
private:
/** Descriptor's characteristic weak back-reference */
std::weak_ptr<GATTCharacteristic> wbr_characteristic;
/**
* For an unknown reason, using the virtual function 'toString()'
* while constructing an exception message causes a SIGSEGV.
* <p>
* This method represents a non-virtual variation,
* which also does not call any other virtual function.
* </p>
*/
std::string toSafeString() const noexcept;
public:
static const uuid16_t TYPE_EXT_PROP;
static const uuid16_t TYPE_USER_DESC;
static const uuid16_t TYPE_CCC_DESC;
static std::shared_ptr<const uuid_t> getStaticType(const uuid16_t & type) noexcept {
return std::shared_ptr<const uuid_t>(&type, [](const uuid_t *){});
}
/**
* Following UUID16 GATT profile attribute types are listed under:
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.4 Summary of GATT Profile Attribute Types
*/
enum Type : uint16_t {
CHARACTERISTIC_APPEARANCE = 0x2A01,
CHARACTERISTIC_PERIPHERAL_PRIV_FLAG = 0x2A02,
CHARACTERISTIC_RECONNECTION_ADDRESS = 0x2A03,
CHARACTERISTIC_PERIPHERAL_PREF_CONN = 0x2A04,
CHARACTERISTIC_SERVICE_CHANGED = 0x2A05,
/* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.1 Characteristic Extended Properties */
CHARACTERISTIC_EXTENDED_PROPERTIES = 0x2900,
/* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.2 Characteristic User Description (Characteristic Descriptor, optional, single, string) */
CHARACTERISTIC_USER_DESCRIPTION = 0x2901,
/* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration (Characteristic Descriptor, optional, single, uint16_t bitfield) */
CLIENT_CHARACTERISTIC_CONFIGURATION = 0x2902,
/* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.4 Server Characteristic Configuration (Characteristic Descriptor, optional, single, bitfield) */
SERVER_CHARACTERISTIC_CONFIGURATION = 0x2903,
/* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.5 Characteristic Presentation Format (Characteristic Descriptor, optional, single, complex) */
CHARACTERISTIC_PRESENTATION_FORMAT = 0x2904,
CHARACTERISTIC_AGGREGATE_FORMAT = 0x2905,
/** Our identifier to mark a custom vendor Characteristic Descriptor */
CUSTOM_CHARACTERISTIC_DESCRIPTION = 0x8888
};
/** Type of descriptor */
std::shared_ptr<const uuid_t> type;
/**
* Characteristic Descriptor Handle
* <p>
* Attribute handles are unique for each device (server) (BT Core Spec v5.2: Vol 3, Part F Protocol..: 3.2.2 Attribute Handle).
* </p>
*/
const uint16_t handle;
/* Characteristics Descriptor's Value */
POctets value;
GATTDescriptor(const GATTCharacteristicRef & characteristic, const std::shared_ptr<const uuid_t> & type,
const uint16_t handle) noexcept
: wbr_characteristic(characteristic), type(type), handle(handle), value(0) {}
std::string get_java_class() const noexcept override {
return java_class();
}
static std::string java_class() noexcept {
return std::string(JAVA_DBT_PACKAGE "DBTGattDescriptor");
}
std::shared_ptr<GATTCharacteristic> getCharacteristicUnchecked() const noexcept { return wbr_characteristic.lock(); }
std::shared_ptr<GATTCharacteristic> getCharacteristicChecked() const;
std::shared_ptr<GATTHandler> getGATTHandlerChecked() const;
std::shared_ptr<DBTDevice> getDeviceChecked() const;
virtual std::string toString() const noexcept override;
/** Value is uint16_t bitfield */
bool isExtendedProperties() const noexcept { return TYPE_EXT_PROP == *type; }
/* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration (Characteristic Descriptor, optional, single, uint16_t bitfield) */
bool isClientCharacteristicConfiguration() const noexcept{ return TYPE_CCC_DESC == *type; }
/**
* BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.1 Read Characteristic Descriptor
* <p>
* BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.2 Read Long Characteristic Descriptor
* </p>
* <p>
* If expectedLength = 0, then only one ATT_READ_REQ/RSP will be used.
* </p>
* <p>
* 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.
* </p>
* <p>
* If expectedLength > 0, then long values using multiple ATT_READ_BLOB_REQ/RSP will be used
* if required until the response returns zero.
* </p>
* <p>
* Convenience delegation call to GATTHandler via DBTDevice
* If the DBTDevice's GATTHandler is null, i.e. not connected, an IllegalStateException is thrown.
* </p>
*/
bool readValue(int expectedLength=-1);
/**
* BT Core Spec v5.2: Vol 3, Part G GATT: 4.12.3 Write Characteristic Descriptors
* <p>
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3 Characteristic Descriptor
* </p>
* <p>
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration
* </p>
* <p>
* Convenience delegation call to GATTHandler via DBTDevice
* If the DBTDevice's GATTHandler is null, i.e. not connected, an IllegalStateException is thrown.
* </p>
*/
bool writeValue();
};
typedef std::shared_ptr<GATTDescriptor> GATTDescriptorRef;
inline bool operator==(const GATTDescriptor& lhs, const GATTDescriptor& rhs) noexcept
{ return lhs.handle == rhs.handle; /** unique attribute handles */ }
inline bool operator!=(const GATTDescriptor& lhs, const GATTDescriptor& rhs) noexcept
{ return !(lhs == rhs); }
} // namespace direct_bt
#endif /* GATT_DESCRIPTOR_HPP_ */
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