/* * * GattLib - GATT Library * * Copyright (C) 2016-2020 Olivier Martin * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #ifndef __GATTLIB_H__ #define __GATTLIB_H__ #ifdef __cplusplus extern "C" { #endif #include #include #include #include #ifndef BDADDR_BREDR /* GattLib note: BD Address have only been introduced into Bluez v4.100. */ /* Prior to this version, only BDADDR_BREDR can be supported */ /* BD Address type */ #define BDADDR_BREDR 0x00 #define BDADDR_LE_PUBLIC 0x01 #define BDADDR_LE_RANDOM 0x02 #endif #if BLUEZ_VERSION_MAJOR == 5 #define ATT_MAX_MTU ATT_MAX_VALUE_LEN #endif /** * @name Gattlib errors */ //@{ #define GATTLIB_SUCCESS 0 #define GATTLIB_INVALID_PARAMETER 1 #define GATTLIB_NOT_FOUND 2 #define GATTLIB_OUT_OF_MEMORY 3 #define GATTLIB_NOT_SUPPORTED 4 #define GATTLIB_DEVICE_ERROR 5 #define GATTLIB_ERROR_DBUS 6 #define GATTLIB_ERROR_BLUEZ 7 #define GATTLIB_ERROR_INTERNAL 8 //@} /** * @name GATT Characteristic Properties Bitfield values */ //@{ #define GATTLIB_CHARACTERISTIC_BROADCAST 0x01 #define GATTLIB_CHARACTERISTIC_READ 0x02 #define GATTLIB_CHARACTERISTIC_WRITE_WITHOUT_RESP 0x04 #define GATTLIB_CHARACTERISTIC_WRITE 0x08 #define GATTLIB_CHARACTERISTIC_NOTIFY 0x10 #define GATTLIB_CHARACTERISTIC_INDICATE 0x20 //@} /** * Helper function to create UUID16 from a 16bit integer */ #define CREATE_UUID16(value16) { .type=SDP_UUID16, .value.uuid16=(value16) } /** * @name Options for gattlib_connect() * * @note Options with the prefix `GATTLIB_CONNECTION_OPTIONS_LEGACY_` * is for Bluez prior to v5.42 (before Bluez) support */ //@{ #define GATTLIB_CONNECTION_OPTIONS_LEGACY_BDADDR_LE_PUBLIC (1 << 0) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_BDADDR_LE_RANDOM (1 << 1) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_BT_SEC_LOW (1 << 2) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_BT_SEC_MEDIUM (1 << 3) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_BT_SEC_HIGH (1 << 4) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_PSM(value) (((value) & 0x3FF) << 11) //< We encode PSM on 10 bits (up to 1023) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_MTU(value) (((value) & 0x3FF) << 21) //< We encode MTU on 10 bits (up to 1023) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_GET_PSM(options) (((options) >> 11) && 0x3FF) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_GET_MTU(options) (((options) >> 21) && 0x3FF) #define GATTLIB_CONNECTION_OPTIONS_LEGACY_DEFAULT \ GATTLIB_CONNECTION_OPTIONS_LEGACY_BDADDR_LE_PUBLIC | \ GATTLIB_CONNECTION_OPTIONS_LEGACY_BDADDR_LE_RANDOM | \ GATTLIB_CONNECTION_OPTIONS_LEGACY_BT_SEC_LOW //@} /** * @name Discover filter */ //@{ #define GATTLIB_DISCOVER_FILTER_USE_NONE 0 #define GATTLIB_DISCOVER_FILTER_USE_UUID (1 << 0) #define GATTLIB_DISCOVER_FILTER_USE_RSSI (1 << 1) #define GATTLIB_DISCOVER_FILTER_NOTIFY_CHANGE (1 << 2) //@} /** * @name Gattlib Eddystone types */ //@{ #define GATTLIB_EDDYSTONE_TYPE_UID (1 << 0) #define GATTLIB_EDDYSTONE_TYPE_URL (1 << 1) #define GATTLIB_EDDYSTONE_TYPE_TLM (1 << 2) #define GATTLIB_EDDYSTONE_TYPE_EID (1 << 3) #define GATTLIB_EDDYSTONE_LIMIT_RSSI (1 << 4) //@} /** * @name Eddystone ID types defined by its specification: https://github.com/google/eddystone */ //@{ #define EDDYSTONE_TYPE_UID 0x00 #define EDDYSTONE_TYPE_URL 0x10 #define EDDYSTONE_TYPE_TLM 0x20 #define EDDYSTONE_TYPE_EID 0x30 //@} typedef struct _gatt_connection_t gatt_connection_t; typedef struct _gatt_stream_t gatt_stream_t; /** * Structure to represent a GATT Service and its data in the BLE advertisement packet */ typedef struct { uuid_t uuid; /**< UUID of the GATT Service */ uint8_t* data; /**< Data attached to the GATT Service */ size_t data_length; /**< Length of data attached to the GATT Service */ } gattlib_advertisement_data_t; typedef void (*gattlib_event_handler_t)(const uuid_t* uuid, const uint8_t* data, size_t data_length, void* user_data); /** * @brief Handler called on disconnection * * @param connection Connection that is disconnecting * @param user_data Data defined when calling `gattlib_register_on_disconnect()` */ typedef void (*gattlib_disconnection_handler_t)(void* user_data); /** * @brief Handler called on new discovered BLE device * * @param adapter is the adapter that has found the BLE device * @param addr is the MAC address of the BLE device * @param name is the name of BLE device if advertised * @param user_data Data defined when calling `gattlib_register_on_disconnect()` */ typedef void (*gattlib_discovered_device_t)(void *adapter, const char* addr, const char* name, void *user_data); /** * @brief Handler called on new discovered BLE device * * @param adapter is the adapter that has found the BLE device * @param addr is the MAC address of the BLE device * @param name is the name of BLE device if advertised * @param advertisement_data is an array of Service UUID and their respective data * @param advertisement_data_count is the number of elements in the advertisement_data array * @param manufacturer_id is the ID of the Manufacturer ID * @param manufacturer_data is the data following Manufacturer ID * @param manufacturer_data_size is the size of manufacturer_data * @param user_data Data defined when calling `gattlib_register_on_disconnect()` */ typedef void (*gattlib_discovered_device_with_data_t)(void *adapter, const char* addr, const char* name, gattlib_advertisement_data_t *advertisement_data, size_t advertisement_data_count, uint16_t manufacturer_id, uint8_t *manufacturer_data, size_t manufacturer_data_size, void *user_data); /** * @brief Handler called on asynchronous connection when connection is ready * * @param connection Connection that is disconnecting * @param user_data Data defined when calling `gattlib_register_on_disconnect()` */ typedef void (*gatt_connect_cb_t)(gatt_connection_t* connection, void* user_data); /** * @brief Callback called when GATT characteristic read value has been received * * @param buffer contains the value to read. * @param buffer_len Length of the read data * */ typedef void* (*gatt_read_cb_t)(const void *buffer, size_t buffer_len); /** * @brief Constant defining Eddystone common data UID in Advertisement data */ extern const uuid_t gattlib_eddystone_common_data_uuid; /** * @brief List of prefix for Eddystone URL Scheme */ extern const char *gattlib_eddystone_url_scheme_prefix[]; /** * @brief Open Bluetooth adapter * * @param adapter_name With value NULL, the default adapter will be selected. * @param adapter is the context of the newly opened adapter * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_adapter_open(const char* adapter_name, void** adapter); /** * @brief Enable Bluetooth scanning on a given adapter * * @param adapter is the context of the newly opened adapter * @param discovered_device_cb is the function callback called for each new Bluetooth device discovered * @param timeout defines the duration of the Bluetooth scanning. When timeout=0, we scan indefinitely. * @param user_data is the data passed to the callback `discovered_device_cb()` * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_adapter_scan_enable(void* adapter, gattlib_discovered_device_t discovered_device_cb, size_t timeout, void *user_data); /** * @brief Enable Bluetooth scanning on a given adapter * * @param adapter is the context of the newly opened adapter * @param uuid_list is a NULL-terminated list of UUIDs to filter. The rule only applies to advertised UUID. * Returned devices would match any of the UUIDs of the list. * @param rssi_threshold is the imposed RSSI threshold for the returned devices. * @param enabled_filters defines the parameters to use for filtering. There are selected by using the macros * GATTLIB_DISCOVER_FILTER_USE_UUID and GATTLIB_DISCOVER_FILTER_USE_RSSI. * @param discovered_device_cb is the function callback called for each new Bluetooth device discovered * @param timeout defines the duration of the Bluetooth scanning. When timeout=0, we scan indefinitely. * @param user_data is the data passed to the callback `discovered_device_cb()` * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_adapter_scan_enable_with_filter(void *adapter, uuid_t **uuid_list, int16_t rssi_threshold, uint32_t enabled_filters, gattlib_discovered_device_t discovered_device_cb, size_t timeout, void *user_data); /** * @brief Enable Eddystone Bluetooth Device scanning on a given adapter * * @param adapter is the context of the newly opened adapter * @param rssi_threshold is the imposed RSSI threshold for the returned devices. * @param eddystone_types defines the type(s) of Eddystone advertisement data type to select. * The types are defined by the macros `GATTLIB_EDDYSTONE_TYPE_*`. The macro `GATTLIB_EDDYSTONE_LIMIT_RSSI` * can also be used to limit RSSI with rssi_threshold. * @param discovered_device_cb is the function callback called for each new Bluetooth device discovered * @param timeout defines the duration of the Bluetooth scanning. When timeout=0, we scan indefinitely. * @param user_data is the data passed to the callback `discovered_device_cb()` * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_adapter_scan_eddystone(void *adapter, int16_t rssi_threshold, uint32_t eddystone_types, gattlib_discovered_device_with_data_t discovered_device_cb, size_t timeout, void *user_data); /** * @brief Disable Bluetooth scanning on a given adapter * * @param adapter is the context of the newly opened adapter * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_adapter_scan_disable(void* adapter); /** * @brief Close Bluetooth adapter context * * @param adapter is the context of the newly opened adapter * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_adapter_close(void* adapter); /** * @brief Function to connect to a BLE device * * @param adapter Local Adaptater interface. When passing NULL, we use default adapter. * @param dst Remote Bluetooth address * @param options Options to connect to BLE device. See `GATTLIB_CONNECTION_OPTIONS_*` */ gatt_connection_t *gattlib_connect(void *adapter, const char *dst, unsigned long options); /** * @brief Function to asynchronously connect to a BLE device * * @note This function is mainly used before Bluez v5.42 (prior to D-BUS support) * * @param adapter Local Adaptater interface. When passing NULL, we use default adapter. * @param dst Remote Bluetooth address * @param options Options to connect to BLE device. See `GATTLIB_CONNECTION_OPTIONS_*` * @param connect_cb is the callback to call when the connection is established * @param user_data is the user specific data to pass to the callback */ gatt_connection_t *gattlib_connect_async(void *adapter, const char *dst, unsigned long options, gatt_connect_cb_t connect_cb, void* user_data); /** * @brief Function to disconnect the GATT connection * * @param connection Active GATT connection * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_disconnect(gatt_connection_t* connection); /** * @brief Function to register a callback on GATT disconnection * * @param connection Active GATT connection * @param handler is the callaback to invoke on disconnection * @param user_data is user specific data to pass to the callaback * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ void gattlib_register_on_disconnect(gatt_connection_t *connection, gattlib_disconnection_handler_t handler, void* user_data); /** * Structure to represent GATT Primary Service */ typedef struct { uint16_t attr_handle_start; /**< First attribute handle of the GATT Primary Service */ uint16_t attr_handle_end; /**< Last attibute handle of the GATT Primary Service */ uuid_t uuid; /**< UUID of the Primary Service */ } gattlib_primary_service_t; /** * Structure to represent GATT Characteristic */ typedef struct { uint16_t handle; /**< Handle of the GATT characteristic */ uint8_t properties; /**< Property of the GATT characteristic */ uint16_t value_handle; /**< Handle for the value of the GATT characteristic */ uuid_t uuid; /**< UUID of the GATT characteristic */ } gattlib_characteristic_t; /** * Structure to represent GATT Descriptor */ typedef struct { uint16_t handle; /**< Handle of the GATT Descriptor */ uint16_t uuid16; /**< UUID16 of the GATT Descriptor */ uuid_t uuid; /**< UUID of the GATT Descriptor */ } gattlib_descriptor_t; /** * @brief Function to discover GATT Services * * @note This function can be used to force GATT services/characteristic discovery * * @param connection Active GATT connection * @param services array of GATT services allocated by the function. Can be NULL. * @param services_count Number of GATT services discovered. Can be NULL * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_discover_primary(gatt_connection_t* connection, gattlib_primary_service_t** services, int* services_count); /** * @brief Function to discover GATT Characteristic * * @note This function can be used to force GATT services/characteristic discovery * * @param connection Active GATT connection * @param start is the index of the first handle of the range * @param end is the index of the last handle of the range * @param characteristics array of GATT characteristics allocated by the function. Can be NULL. * @param characteristics_count Number of GATT characteristics discovered. Can be NULL * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_discover_char_range(gatt_connection_t* connection, int start, int end, gattlib_characteristic_t** characteristics, int* characteristics_count); /** * @brief Function to discover GATT Characteristic * * @note This function can be used to force GATT services/characteristic discovery * * @param connection Active GATT connection * @param characteristics array of GATT characteristics allocated by the function. Can be NULL. * @param characteristics_count Number of GATT characteristics discovered. Can be NULL * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_discover_char(gatt_connection_t* connection, gattlib_characteristic_t** characteristics, int* characteristics_count); /** * @brief Function to discover GATT Descriptors in a range of handles * * @param connection Active GATT connection * @param start is the index of the first handle of the range * @param end is the index of the last handle of the range * @param descriptors array of GATT descriptors allocated by the function. Can be NULL. * @param descriptors_count Number of GATT descriptors discovered. Can be NULL * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_discover_desc_range(gatt_connection_t* connection, int start, int end, gattlib_descriptor_t** descriptors, int* descriptors_count); /** * @brief Function to discover GATT Descriptor * * @param connection Active GATT connection * @param descriptors array of GATT descriptors allocated by the function. Can be NULL. * @param descriptors_count Number of GATT descriptors discovered. Can be NULL * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_discover_desc(gatt_connection_t* connection, gattlib_descriptor_t** descriptors, int* descriptors_count); /** * @brief Function to read GATT characteristic * * @note buffer is allocated by the function. It is the responsibility of the caller to free the buffer. * * @param connection Active GATT connection * @param uuid UUID of the GATT characteristic to read * @param buffer contains the value to read. It is allocated by the function. * @param buffer_len Length of the read data * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_read_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, void** buffer, size_t* buffer_len); /** * @brief Function to asynchronously read GATT characteristic * * @param connection Active GATT connection * @param uuid UUID of the GATT characteristic to read * @param gatt_read_cb is the callback to read when the GATT characteristic is available * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_read_char_by_uuid_async(gatt_connection_t* connection, uuid_t* uuid, gatt_read_cb_t gatt_read_cb); /** * @brief Function to write to the GATT characteristic UUID * * @param connection Active GATT connection * @param uuid UUID of the GATT characteristic to read * @param buffer contains the values to write to the GATT characteristic * @param buffer_len is the length of the buffer to write * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, const void* buffer, size_t buffer_len); /** * @brief Function to write to the GATT characteristic handle * * @param connection Active GATT connection * @param handle is the handle of the GATT characteristic * @param buffer contains the values to write to the GATT characteristic * @param buffer_len is the length of the buffer to write * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_char_by_handle(gatt_connection_t* connection, uint16_t handle, const void* buffer, size_t buffer_len); /** * @brief Function to write without response to the GATT characteristic UUID * * @param connection Active GATT connection * @param uuid UUID of the GATT characteristic to read * @param buffer contains the values to write to the GATT characteristic * @param buffer_len is the length of the buffer to write * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_without_response_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, const void* buffer, size_t buffer_len); /** * @brief Create a stream to a GATT characteristic to write data in continue * * @note: The GATT characteristic must support 'Write-Without-Response' * * @param connection Active GATT connection * @param uuid UUID of the GATT characteristic to write * @param stream is the object that is attached to the GATT characteristic that is used to write data to * @param mtu is the MTU of the GATT connection to optimise the stream writting * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_char_by_uuid_stream_open(gatt_connection_t* connection, uuid_t* uuid, gatt_stream_t **stream, uint16_t *mtu); /** * @brief Write data to the stream previously created with `gattlib_write_char_by_uuid_stream_open()` * * @param stream is the object that is attached to the GATT characteristic that is used to write data to * @param buffer is the data to write to the stream * @param buffer_len is the length of the buffer to write * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_char_stream_write(gatt_stream_t *stream, const void *buffer, size_t buffer_len); /** * @brief Close the stream previously created with `gattlib_write_char_by_uuid_stream_open()` * * @param stream is the object that is attached to the GATT characteristic that is used to write data to * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_char_stream_close(gatt_stream_t *stream); /** * @brief Function to write without response to the GATT characteristic handle * * @param connection Active GATT connection * @param handle is the handle of the GATT characteristic * @param buffer contains the values to write to the GATT characteristic * @param buffer_len is the length of the buffer to write * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_write_without_response_char_by_handle(gatt_connection_t* connection, uint16_t handle, const void* buffer, size_t buffer_len); /* * @brief Enable notification on GATT characteristic represented by its UUID * * @param connection Active GATT connection * @param uuid UUID of the characteristic that will trigger the notification * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_notification_start(gatt_connection_t* connection, const uuid_t* uuid); /* * @brief Disable notification on GATT characteristic represented by its UUID * * @param connection Active GATT connection * @param uuid UUID of the characteristic that will trigger the notification * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_notification_stop(gatt_connection_t* connection, const uuid_t* uuid); /* * @brief Enable indication on GATT characteristic represented by its UUID * * @param connection Active GATT connection * @param uuid UUID of the characteristic that will trigger the indication * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_indication_start(gatt_connection_t* connection, const uuid_t* uuid); /* * @brief Disable indication on GATT characteristic represented by its UUID * * @param connection Active GATT connection * @param uuid UUID of the characteristic that will trigger the indication * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_indication_stop(gatt_connection_t* connection, const uuid_t* uuid); /* * @brief Register a handle for the GATT notifications * * @param connection Active GATT connection * @param notification_handler is the handler to call on notification * @param user_data if the user specific data to pass to the handler * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ void gattlib_register_notification(gatt_connection_t* connection, gattlib_event_handler_t notification_handler, void* user_data); /* * @brief Register a handle for the GATT indications * * @param connection Active GATT connection * @param notification_handler is the handler to call on indications * @param user_data if the user specific data to pass to the handler * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ void gattlib_register_indication(gatt_connection_t* connection, gattlib_event_handler_t indication_handler, void* user_data); #if 0 // Disable until https://github.com/labapart/gattlib/issues/75 is resolved /** * @brief Function to retrieve RSSI from a GATT connection * * @param connection Active GATT connection * @param rssi is the Received Signal Strength Indicator of the remote device * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_get_rssi(gatt_connection_t *connection, int16_t *rssi); #endif /** * @brief Function to retrieve RSSI from a MAC Address * * @note: This function is mainly used before a connection is established. Once the connection * established, the function `gattlib_get_rssi()` should be preferred. * * @param adapter is the adapter the new device has been seen * @param mac_address is the MAC address of the device to get the RSSI * @param rssi is the Received Signal Strength Indicator of the remote device * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_get_rssi_from_mac(void *adapter, const char *mac_address, int16_t *rssi); /** * @brief Function to retrieve Advertisement Data from a MAC Address * * @param connection Active GATT connection * @param advertisement_data is an array of Service UUID and their respective data * @param advertisement_data_count is the number of elements in the advertisement_data array * @param manufacturer_id is the ID of the Manufacturer ID * @param manufacturer_data is the data following Manufacturer ID * @param manufacturer_data_size is the size of manufacturer_data * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_get_advertisement_data(gatt_connection_t *connection, gattlib_advertisement_data_t **advertisement_data, size_t *advertisement_data_count, uint16_t *manufacturer_id, uint8_t **manufacturer_data, size_t *manufacturer_data_size); /** * @brief Function to retrieve Advertisement Data from a MAC Address * * @param adapter is the adapter the new device has been seen * @param mac_address is the MAC address of the device to get the RSSI * @param advertisement_data is an array of Service UUID and their respective data * @param advertisement_data_count is the number of elements in the advertisement_data array * @param manufacturer_id is the ID of the Manufacturer ID * @param manufacturer_data is the data following Manufacturer ID * @param manufacturer_data_size is the size of manufacturer_data * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_get_advertisement_data_from_mac(void *adapter, const char *mac_address, gattlib_advertisement_data_t **advertisement_data, size_t *advertisement_data_count, uint16_t *manufacturer_id, uint8_t **manufacturer_data, size_t *manufacturer_data_size); /** * @brief Convert a UUID into a string * * @param uuid is the UUID to convert * @param str is the buffer that will contain the string * @param size is the size of the buffer * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_uuid_to_string(const uuid_t *uuid, char *str, size_t size); /** * @brief Convert a string representing a UUID into a UUID structure * * @param str is the buffer containing the string * @param size is the size of the buffer * @param uuid is the UUID structure that would receive the UUID * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_string_to_uuid(const char *str, size_t size, uuid_t *uuid); /** * @brief Compare two UUIDs * * @param uuid1 is the one of the UUID to compare with * @param uuid2 is the other UUID to compare with * * @return GATTLIB_SUCCESS on success or GATTLIB_* error code */ int gattlib_uuid_cmp(const uuid_t *uuid1, const uuid_t *uuid2); #ifdef __cplusplus } #endif #endif