/* * Copyright (C) 2014 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #ifndef __ATT_H #define __ATT_H #include #include "bluetooth.h" #if defined __cplusplus extern "C" { #endif // custom BTstack error codes #define ATT_ERROR_HCI_DISCONNECT_RECEIVED 0x1f // custom BTstack ATT error coders #define ATT_ERROR_DATA_MISMATCH 0x7e #define ATT_ERROR_TIMEOUT 0x7F typedef struct att_connection { hci_con_handle_t con_handle; uint16_t mtu; // initialized to ATT_DEFAULT_MTU (23), negotiated during MTU exchange uint16_t max_mtu; // local maximal L2CAP_MTU, set to l2cap_max_le_mtu() uint8_t encryption_key_size; uint8_t authenticated; uint8_t authorized; } att_connection_t; // ATT Client Read Callback for Dynamic Data // - if buffer == NULL, don't copy data, just return size of value // - if buffer != NULL, copy data and return number bytes copied // @param con_handle of hci le connection // @param attribute_handle to be read // @param offset defines start of attribute value // @param buffer // @param buffer_size typedef uint16_t (*att_read_callback_t)(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size); // ATT Client Write Callback for Dynamic Data // @param con_handle of hci le connection // @param attribute_handle to be written // @param transaction - ATT_TRANSACTION_MODE_NONE for regular writes, ATT_TRANSACTION_MODE_ACTIVE for prepared writes and ATT_TRANSACTION_MODE_EXECUTE // @param offset into the value - used for queued writes and long attributes // @param buffer // @param buffer_size // @param signature used for signed write commmands // @returns 0 if write was ok, ATT_ERROR_PREPARE_QUEUE_FULL if no space in queue, ATT_ERROR_INVALID_OFFSET if offset is larger than max buffer typedef int (*att_write_callback_t)(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size); // MARK: ATT Operations /* * @brief setup ATT database */ void att_set_db(uint8_t const * db); /* * @brief set callback for read of dynamic attributes * @param callback */ void att_set_read_callback(att_read_callback_t callback); /* * @brief set callback for write of dynamic attributes * @param callback */ void att_set_write_callback(att_write_callback_t callback); /* * @brief debug helper, dump ATT database to stdout using log_info */ void att_dump_attributes(void); /* * @brief process ATT request against database and put response into response buffer * @param att_connection used for mtu and security properties * @param request_buffer, request_len: ATT request from clinet * @param response_buffer for result * @returns len of data in response buffer. 0 = no response */ uint16_t att_handle_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, uint8_t * response_buffer); /* * @brief setup value notification in response buffer for a given handle and value * @param att_connection * @param attribute_handle * @param value * @param value_len * @param response_buffer for notification */ uint16_t att_prepare_handle_value_notification(att_connection_t * att_connection, uint16_t attribute_handle, uint8_t *value, uint16_t value_len, uint8_t * response_buffer); /* * @brief setup value indication in response buffer for a given handle and value * @param att_connection * @param attribute_handle * @param value * @param value_len * @param response_buffer for indication */ uint16_t att_prepare_handle_value_indication(att_connection_t * att_connection, uint16_t attribute_handle, uint8_t *value, uint16_t value_len, uint8_t * response_buffer); /* * @brief transcation queue of prepared writes, e.g., after disconnect */ void att_clear_transaction_queue(att_connection_t * att_connection); // experimental client API uint16_t att_uuid_for_handle(uint16_t attribute_handle); #if defined __cplusplus } #endif #endif // __ATT_H