/** * Copyright (c) 2013 - 2018, Nordic Semiconductor ASA * * All rights reserved. * * 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, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, 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 Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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. * */ #include "sdk_common.h" #if NRF_MODULE_ENABLED(BLE_DB_DISCOVERY) #include "ble_db_discovery.h" #include #include "ble_srv_common.h" #define NRF_LOG_MODULE_NAME ble_db_disc #include "nrf_log.h" NRF_LOG_MODULE_REGISTER(); #define SRV_DISC_START_HANDLE 0x0001 /**< The start handle value used during service discovery. */ #define DB_DISCOVERY_MAX_USERS BLE_DB_DISCOVERY_MAX_SRV /**< The maximum number of users/registrations allowed by this module. */ #define MODULE_INITIALIZED (m_initialized == true) /**< Macro designating whether the module has been initialized properly. */ /**@brief Array of structures containing information about the registered application modules. */ static ble_uuid_t m_registered_handlers[DB_DISCOVERY_MAX_USERS]; /**@brief Array of structures containing pending events to be sent to the application modules. * * @details Whenever a discovery related event is to be raised to a user module, it will be stored * in this array first. When all services needed to be discovered have been * discovered, all pending events will be sent to the corresponding user modules. **/ static struct { ble_db_discovery_evt_t evt; /**< The pending event. */ ble_db_discovery_evt_handler_t evt_handler; /**< The event handler which should be called to raise this event. */ } m_pending_user_evts[DB_DISCOVERY_MAX_USERS]; static ble_db_discovery_evt_handler_t m_evt_handler; static uint32_t m_pending_usr_evt_index; /**< The index to the pending user event array, pointing to the last added pending user event. */ static uint32_t m_num_of_handlers_reg; /**< The number of handlers registered with the DB Discovery module. */ static bool m_initialized = false; /**< This variable Indicates if the module is initialized or not. */ /**@brief Function for fetching the event handler provided by a registered application module. * * @param[in] srv_uuid UUID of the service. * * @retval evt_handler Event handler of the module, registered for the given service UUID. * @retval NULL If no event handler is found. */ static ble_db_discovery_evt_handler_t registered_handler_get(ble_uuid_t const * p_srv_uuid) { for (uint32_t i = 0; i < m_num_of_handlers_reg; i++) { if (BLE_UUID_EQ(&(m_registered_handlers[i]), p_srv_uuid)) { return (m_evt_handler); } } return NULL; } /**@brief Function for storing the event handler provided by a registered application module. * * @param[in] p_srv_uuid The UUID of the service. * @param[in] p_evt_handler The event handler provided by the application. * * @retval NRF_SUCCESS If the handler was stored or already present in the list. * @retval NRF_ERROR_NO_MEM If there is no space left to store the handler. */ static uint32_t registered_handler_set(ble_uuid_t const * p_srv_uuid, ble_db_discovery_evt_handler_t p_evt_handler) { if (registered_handler_get(p_srv_uuid) != NULL) { return NRF_SUCCESS; } if (m_num_of_handlers_reg < DB_DISCOVERY_MAX_USERS) { m_registered_handlers[m_num_of_handlers_reg] = *p_srv_uuid; m_num_of_handlers_reg++; return NRF_SUCCESS; } else { return NRF_ERROR_NO_MEM; } } /**@brief Function for sending all pending discovery events to the corresponding user modules. */ static void pending_user_evts_send(void) { for (uint32_t i = 0; i < m_num_of_handlers_reg; i++) { // Pass the event to the corresponding event handler. m_pending_user_evts[i].evt_handler(&(m_pending_user_evts[i].evt)); } m_pending_usr_evt_index = 0; } /**@brief Function for indicating error to the application. * * @details This function will fetch the event handler based on the UUID of the service being * discovered. (The event handler is registered by the application beforehand). * The error code is added to the pending events together with the event handler. * If no event handler was found, then this function will do nothing. * * @param[in] p_db_discovery Pointer to the DB discovery structure. * @param[in] err_code Error code that should be provided to the application. * @param[in] conn_handle Connection Handle. * */ static void discovery_error_evt_trigger(ble_db_discovery_t * p_db_discovery, uint32_t err_code, uint16_t conn_handle) { ble_db_discovery_evt_handler_t p_evt_handler; ble_gatt_db_srv_t * p_srv_being_discovered; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_evt_handler = registered_handler_get(&(p_srv_being_discovered->srv_uuid)); if (p_evt_handler != NULL) { ble_db_discovery_evt_t evt = { .conn_handle = conn_handle, .evt_type = BLE_DB_DISCOVERY_ERROR, .params.err_code = err_code, }; p_evt_handler(&evt); } } /**@brief Function for triggering a Discovery Complete or Service Not Found event to the * application. * * @details This function will fetch the event handler based on the UUID of the service being * discovered. (The event handler is registered by the application beforehand). * It then triggers an event indicating the completion of the service discovery. * If no event handler was found, then this function will do nothing. * * @param[in] p_db_discovery Pointer to the DB discovery structure. * @param[in] is_srv_found Variable to indicate if the service was found at the peer. * @param[in] conn_handle Connection Handle. */ static void discovery_complete_evt_trigger(ble_db_discovery_t * p_db_discovery, bool is_srv_found, uint16_t conn_handle) { ble_db_discovery_evt_handler_t p_evt_handler; ble_gatt_db_srv_t * p_srv_being_discovered; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_evt_handler = registered_handler_get(&(p_srv_being_discovered->srv_uuid)); if (p_evt_handler != NULL) { if (m_pending_usr_evt_index < DB_DISCOVERY_MAX_USERS) { // Insert an event into the pending event list. m_pending_user_evts[m_pending_usr_evt_index].evt.conn_handle = conn_handle; m_pending_user_evts[m_pending_usr_evt_index].evt.params.discovered_db = *p_srv_being_discovered; if (is_srv_found) { m_pending_user_evts[m_pending_usr_evt_index].evt.evt_type = BLE_DB_DISCOVERY_COMPLETE; } else { m_pending_user_evts[m_pending_usr_evt_index].evt.evt_type = BLE_DB_DISCOVERY_SRV_NOT_FOUND; } m_pending_user_evts[m_pending_usr_evt_index].evt_handler = p_evt_handler; m_pending_usr_evt_index++; if (m_pending_usr_evt_index == m_num_of_handlers_reg) { // All registered modules have pending events. Send all pending events to the user // modules. pending_user_evts_send(); } else { // Too many events pending. Do nothing. (Ideally this should not happen.) } } } } /**@brief Function for handling service discovery completion. * * @details This function will be used to determine if there are more services to be discovered, * and if so, initiate the discovery of the next service. * * @param[in] p_db_discovery Pointer to the DB Discovery Structure. * @param[in] conn_handle Connection Handle. */ static void on_srv_disc_completion(ble_db_discovery_t * p_db_discovery, uint16_t conn_handle) { p_db_discovery->discoveries_count++; // NRF_LOG_INFO("incremented discovery count:%d",p_db_discovery->discoveries_count); // Check if more services need to be discovered. if (p_db_discovery->discoveries_count < m_num_of_handlers_reg) { // Reset the current characteristic index since a new service discovery is about to start. p_db_discovery->curr_char_ind = 0; // Initiate discovery of the next service. p_db_discovery->curr_srv_ind++; // NRF_LOG_INFO("incremented service index: %d",p_db_discovery->curr_srv_ind); ble_gatt_db_srv_t * p_srv_being_discovered; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_srv_being_discovered->srv_uuid = m_registered_handlers[p_db_discovery->curr_srv_ind]; // Reset the characteristic count in the current service to zero since a new service // discovery is about to start. p_srv_being_discovered->char_count = 0; NRF_LOG_INFO("Starting discovery of servicce with UUID 0x%x on connection handle 0x%x.", p_srv_being_discovered->srv_uuid.uuid, conn_handle); uint32_t err_code; err_code = sd_ble_gattc_primary_services_discover(conn_handle, SRV_DISC_START_HANDLE, &(p_srv_being_discovered->srv_uuid)); if (err_code != NRF_SUCCESS) { p_db_discovery->discovery_in_progress = false; // Error with discovering the service. // Indicate the error to the registered user application. discovery_error_evt_trigger(p_db_discovery, err_code, conn_handle); m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE; m_pending_user_evts[0].evt.conn_handle = conn_handle; return; } } else { // No more service discovery is needed. p_db_discovery->discovery_in_progress = false; m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE; m_pending_user_evts[0].evt.conn_handle = conn_handle; } } /**@brief Function for finding out if a characteristic discovery should be performed after the * last discovered characteristic. * * @details This function is used during the time of database discovery to find out if there is * a need to do more characteristic discoveries. The value handles of the * last discovered characteristic is compared with the end handle of the service. * If the service handle is greater than one of the former characteristic handles, * it means that a characteristic discovery is required. * * @param[in] p_db_discovery The pointer to the DB Discovery structure. * @param[in] p_after_char The pointer to the last discovered characteristic. * * @retval True if a characteristic discovery is required. * @retval False if a characteristic discovery is NOT required. */ static bool is_char_discovery_reqd(ble_db_discovery_t * p_db_discovery, ble_gattc_char_t * p_after_char) { if (p_after_char->handle_value < p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle) { // Handle value of the characteristic being discovered is less than the end handle of // the service being discovered. There is a possibility of more characteristics being // present. Hence a characteristic discovery is required. return true; } return false; } /**@brief Function to find out if a descriptor discovery is required. * * @details This function finds out if there is a possibility of existence of descriptors between * current characteristic and the next characteristic. If so, this function will compute * the handle range on which the descriptors may be present and will return it. * If the current characteristic is the last known characteristic, then this function * will use the service end handle to find out if the current characteristic can have * descriptors. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[in] p_curr_char Pointer to the current characteristic. * @param[in] p_next_char Pointer to the next characteristic. This should be NULL if the * caller knows that there is no characteristic after the current * characteristic at the peer. * @param[out] p_handle_range Pointer to the handle range in which descriptors may exist at the * the peer. * * @retval True If a descriptor discovery is required. * @retval False If a descriptor discovery is NOT required. */ static bool is_desc_discovery_reqd(ble_db_discovery_t * p_db_discovery, ble_gatt_db_char_t * p_curr_char, ble_gatt_db_char_t * p_next_char, ble_gattc_handle_range_t * p_handle_range) { if (p_next_char == NULL) { // Current characteristic is the last characteristic in the service. Check if the value // handle of the current characteristic is equal to the service end handle. if ( p_curr_char->characteristic.handle_value == p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle ) { // No descriptors can be present for the current characteristic. p_curr_char is the last // characteristic with no descriptors. return false; } p_handle_range->start_handle = p_curr_char->characteristic.handle_value + 1; // Since the current characteristic is the last characteristic in the service, the end // handle should be the end handle of the service. p_handle_range->end_handle = p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle; return true; } // p_next_char != NULL. Check for existence of descriptors between the current and the next // characteristic. if ((p_curr_char->characteristic.handle_value + 1) == p_next_char->characteristic.handle_decl) { // No descriptors can exist between the two characteristic. return false; } p_handle_range->start_handle = p_curr_char->characteristic.handle_value + 1; p_handle_range->end_handle = p_next_char->characteristic.handle_decl - 1; return true; } /**@brief Function for performing characteristic discovery. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[in] conn_handle Connection Handle. * * @return NRF_SUCCESS if the SoftDevice was successfully requested to perform the characteristic * discovery. Otherwise an error code. This function returns the error code returned * by the SoftDevice API @ref sd_ble_gattc_characteristics_discover. */ static uint32_t characteristics_discover(ble_db_discovery_t * p_db_discovery, uint16_t conn_handle) { ble_gatt_db_srv_t * p_srv_being_discovered; ble_gattc_handle_range_t handle_range; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); if (p_db_discovery->curr_char_ind != 0) { // This is not the first characteristic being discovered. Hence the 'start handle' to be // used must be computed using the handle_value of the previous characteristic. ble_gattc_char_t * p_prev_char; uint8_t prev_char_ind = p_db_discovery->curr_char_ind - 1; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_prev_char = &(p_srv_being_discovered->charateristics[prev_char_ind].characteristic); // NRF_LOG_INFO("Characteristics: %x",p_prev_char); handle_range.start_handle = p_prev_char->handle_value + 1; } else { // This is the first characteristic of this service being discovered. handle_range.start_handle = p_srv_being_discovered->handle_range.start_handle; } handle_range.end_handle = p_srv_being_discovered->handle_range.end_handle; return sd_ble_gattc_characteristics_discover(conn_handle, &handle_range); } /**@brief Function for performing descriptor discovery, if required. * * @details This function will check if descriptor discovery is required and then perform it if * needed. If no more descriptor discovery is required for the service, then the output * parameter p_raise_discov_complete is set to true, indicating to the caller that a * discovery complete event can be triggered to the application. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[out] p_raise_discov_complete The value pointed to by this pointer will be set to true if * the Discovery Complete event can be triggered to the * application. * @param[in] conn_handle Connection Handle. * * @return NRF_SUCCESS if the SoftDevice was successfully requested to perform the descriptor * discovery, or if no more descriptor discovery is required. Otherwise an error code. * This function returns the error code returned by the SoftDevice API @ref * sd_ble_gattc_descriptors_discover. */ static uint32_t descriptors_discover(ble_db_discovery_t * p_db_discovery, bool * p_raise_discov_complete, uint16_t conn_handle) { ble_gattc_handle_range_t handle_range; ble_gatt_db_char_t * p_curr_char_being_discovered; ble_gatt_db_srv_t * p_srv_being_discovered; bool is_discovery_reqd = false; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_curr_char_being_discovered = &(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]); if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count) { // This is the last characteristic of this service. is_discovery_reqd = is_desc_discovery_reqd(p_db_discovery, p_curr_char_being_discovered, NULL, &handle_range); } else { uint8_t i; ble_gatt_db_char_t * p_next_char; for (i = p_db_discovery->curr_char_ind; i < p_srv_being_discovered->char_count; i++) { if (i == (p_srv_being_discovered->char_count - 1)) { // The current characteristic is the last characteristic in the service. p_next_char = NULL; } else { p_next_char = &(p_srv_being_discovered->charateristics[i + 1]); } // Check if it is possible for the current characteristic to have a descriptor. if (is_desc_discovery_reqd(p_db_discovery, p_curr_char_being_discovered, p_next_char, &handle_range)) { is_discovery_reqd = true; break; } else { // No descriptors can exist. p_curr_char_being_discovered = p_next_char; p_db_discovery->curr_char_ind++; } } } if (!is_discovery_reqd) { // No more descriptor discovery required. Discovery is complete. // This informs the caller that a discovery complete event can be triggered. *p_raise_discov_complete = true; return NRF_SUCCESS; } *p_raise_discov_complete = false; return sd_ble_gattc_descriptors_discover(conn_handle, &handle_range); } /**@brief Function for handling primary service discovery response. * * @details This function will handle the primary service discovery response and start the * discovery of characteristics within that service. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[in] p_ble_gattc_evt Pointer to the GATT Client event. */ void on_primary_srv_discovery_rsp(ble_db_discovery_t * p_db_discovery, ble_gattc_evt_t const * p_ble_gattc_evt) { ble_gatt_db_srv_t * p_srv_being_discovered; int start_handle = 0; uint32_t err_code; //NRF_LOG_INFO("In on_primary_srv_discovery_rsp"); p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); // uint8_t num_srv_disc = p_db_discovery->srv_count; //int i; if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle) { // NRF_LOG_INFO("Return from on_primary_srv_discovery_rsp"); // return; } //NRF_LOG_INFO("Number of services discovered: %d ",num_srv_disc); if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS) { ble_gattc_evt_prim_srvc_disc_rsp_t const * p_prim_srvc_disc_rsp_evt; uint32_t err_code; p_prim_srvc_disc_rsp_evt = &(p_ble_gattc_evt->params.prim_srvc_disc_rsp); //for(i=0; i < 4; i++) //{ p_srv_being_discovered->srv_uuid = p_prim_srvc_disc_rsp_evt->services[3].uuid; p_srv_being_discovered->handle_range = p_prim_srvc_disc_rsp_evt->services[3].handle_range; NRF_LOG_INFO("Found service UUID %x and its start handle:%d , End handle: %d", p_srv_being_discovered->srv_uuid.uuid, p_srv_being_discovered->handle_range.start_handle, p_srv_being_discovered->handle_range.end_handle); //} start_handle = (p_srv_being_discovered->handle_range.end_handle) + 1; err_code = characteristics_discover(p_db_discovery, p_ble_gattc_evt->conn_handle); if (err_code != NRF_SUCCESS) { p_db_discovery->discovery_in_progress = false; // NRF_LOG_INFO("Error with discovering the characteristics"); // Indicate the error to the registered user application. discovery_error_evt_trigger(p_db_discovery, err_code, p_ble_gattc_evt->conn_handle); m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE; m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle; } } else { NRF_LOG_INFO("Service UUID 0x%x not found.", p_srv_being_discovered->srv_uuid.uuid); // Trigger Service Not Found event to the application. discovery_complete_evt_trigger(p_db_discovery, false, p_ble_gattc_evt->conn_handle); on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle); } if(p_ble_gattc_evt->gatt_status != BLE_GATT_STATUS_ATTERR_ATTRIBUTE_NOT_FOUND) { err_code = sd_ble_gattc_primary_services_discover( p_db_discovery->conn_handle, start_handle,NULL); if(err_code == NRF_SUCCESS) { NRF_LOG_INFO("Discovery done successfully.."); } else { NRF_LOG_INFO("Discovery Fail.."); } } //on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle); } /**@brief Function for handling characteristic discovery response. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[in] p_ble_gattc_evt Pointer to the GATT Client event. */ static void on_characteristic_discovery_rsp(ble_db_discovery_t * p_db_discovery, ble_gattc_evt_t const * p_ble_gattc_evt) { uint32_t err_code; ble_gatt_db_srv_t * p_srv_being_discovered; bool perform_desc_discov = false; if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle) { //return; } p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS) { ble_gattc_evt_char_disc_rsp_t const * p_char_disc_rsp_evt; p_char_disc_rsp_evt = &(p_ble_gattc_evt->params.char_disc_rsp); // Find out the number of characteristics that were previously discovered (in earlier // characteristic discovery responses, if any). uint8_t num_chars_prev_disc = p_srv_being_discovered->char_count; // Find out the number of characteristics that are currently discovered (in the // characteristic discovery response being handled). uint8_t num_chars_curr_disc = p_char_disc_rsp_evt->count; // Check if the total number of discovered characteristics are supported by this module. if ((num_chars_prev_disc + num_chars_curr_disc) <= BLE_GATT_DB_MAX_CHARS) { // Update the characteristics count. p_srv_being_discovered->char_count += num_chars_curr_disc; NRF_LOG_INFO("Number of characteristics: %d",num_chars_curr_disc); } else { // The number of characteristics discovered at the peer is more than the supported // maximum. This module will store only the characteristics found up to this point. p_srv_being_discovered->char_count = BLE_GATT_DB_MAX_CHARS; NRF_LOG_INFO("Not enough space for characteristics associated with " "service 0x%04X !", p_srv_being_discovered->srv_uuid.uuid); NRF_LOG_WARNING("Increase BLE_GATT_DB_MAX_CHARS to be able to store more " "characteristics for each service!"); } uint32_t i; uint32_t j; for (i = num_chars_prev_disc, j = 0; i < p_srv_being_discovered->char_count; i++, j++) { p_srv_being_discovered->charateristics[i].characteristic = p_char_disc_rsp_evt->chars[j]; //int num = p_srv_being_discovered->charateristics[i].characteristic.uuid.uuid; //NRF_LOG_INFO("discovered %d",num); NRF_LOG_INFO("discovered Characteristics = %x & its Properties:\n\rRead = %d\n\rWrite = %d\n\rWriteWoResp = %d\n\r" """notify = %d\n\rIndicate = %d", p_srv_being_discovered->charateristics[i].characteristic.uuid.uuid, p_srv_being_discovered->charateristics[i].characteristic.char_props.read, p_srv_being_discovered->charateristics[i].characteristic.char_props.write, p_srv_being_discovered->charateristics[i].characteristic.char_props.write_wo_resp, p_srv_being_discovered->charateristics[i].characteristic.char_props.notify, p_srv_being_discovered->charateristics[i].characteristic.char_props.indicate); p_srv_being_discovered->charateristics[i].cccd_handle = BLE_GATT_HANDLE_INVALID; p_srv_being_discovered->charateristics[i].ext_prop_handle = BLE_GATT_HANDLE_INVALID; p_srv_being_discovered->charateristics[i].user_desc_handle = BLE_GATT_HANDLE_INVALID; p_srv_being_discovered->charateristics[i].report_ref_handle = BLE_GATT_HANDLE_INVALID; } ble_gattc_char_t * p_last_known_char; p_last_known_char = &(p_srv_being_discovered->charateristics[i - 1].characteristic); // If no more characteristic discovery is required, or if the maximum number of supported // characteristic per service has been reached, descriptor discovery will be performed. if ( !is_char_discovery_reqd(p_db_discovery, p_last_known_char) || (p_srv_being_discovered->char_count == BLE_GATT_DB_MAX_CHARS)) { perform_desc_discov = true; } else { // Update the current characteristic index. p_db_discovery->curr_char_ind = p_srv_being_discovered->char_count; // Perform another round of characteristic discovery. err_code = characteristics_discover(p_db_discovery, p_ble_gattc_evt->conn_handle); if (err_code != NRF_SUCCESS) { p_db_discovery->discovery_in_progress = false; discovery_error_evt_trigger(p_db_discovery, err_code, p_ble_gattc_evt->conn_handle); m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE; m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle; return; } } } else { // The previous characteristic discovery resulted in no characteristics. // descriptor discovery should be performed. perform_desc_discov = true; } if (perform_desc_discov) { bool raise_discov_complete; p_db_discovery->curr_char_ind = 0; err_code = descriptors_discover(p_db_discovery, &raise_discov_complete, p_ble_gattc_evt->conn_handle); if (err_code != NRF_SUCCESS) { p_db_discovery->discovery_in_progress = false; discovery_error_evt_trigger(p_db_discovery, err_code, p_ble_gattc_evt->conn_handle); m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE; m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle; return; } if (raise_discov_complete) { // No more characteristics and descriptors need to be discovered. Discovery is complete. // Send a discovery complete event to the user application. NRF_LOG_DEBUG("Discovery of service with UUID 0x%x completed with success" " on connection handle 0x%x.", p_srv_being_discovered->srv_uuid.uuid, p_ble_gattc_evt->conn_handle); discovery_complete_evt_trigger(p_db_discovery, true, p_ble_gattc_evt->conn_handle); on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle); } } } /**@brief Function for handling descriptor discovery response. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[in] p_ble_gattc_evt Pointer to the GATT Client event. */ static void on_descriptor_discovery_rsp(ble_db_discovery_t * const p_db_discovery, const ble_gattc_evt_t * const p_ble_gattc_evt) { const ble_gattc_evt_desc_disc_rsp_t * p_desc_disc_rsp_evt; ble_gatt_db_srv_t * p_srv_being_discovered; if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle) { return; } p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_desc_disc_rsp_evt = &(p_ble_gattc_evt->params.desc_disc_rsp); ble_gatt_db_char_t * p_char_being_discovered = &(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]); if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS) { // The descriptor was found at the peer. // Iterate through and collect CCCD, Extended Properties, // User Description & Report Reference descriptor handles. for (uint32_t i = 0; i < p_desc_disc_rsp_evt->count; i++) { switch (p_desc_disc_rsp_evt->descs[i].uuid.uuid) { case BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG: p_char_being_discovered->cccd_handle = p_desc_disc_rsp_evt->descs[i].handle; break; case BLE_UUID_DESCRIPTOR_CHAR_EXT_PROP: p_char_being_discovered->ext_prop_handle = p_desc_disc_rsp_evt->descs[i].handle; break; case BLE_UUID_DESCRIPTOR_CHAR_USER_DESC: p_char_being_discovered->user_desc_handle = p_desc_disc_rsp_evt->descs[i].handle; break; case BLE_UUID_REPORT_REF_DESCR: p_char_being_discovered->report_ref_handle = p_desc_disc_rsp_evt->descs[i].handle; break; } /* Break if we've found all the descriptors we are looking for. */ if (p_char_being_discovered->cccd_handle != BLE_GATT_HANDLE_INVALID && p_char_being_discovered->ext_prop_handle != BLE_GATT_HANDLE_INVALID && p_char_being_discovered->user_desc_handle != BLE_GATT_HANDLE_INVALID && p_char_being_discovered->report_ref_handle != BLE_GATT_HANDLE_INVALID) { break; } } } bool raise_discov_complete = false; if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count) { // No more characteristics and descriptors need to be discovered. Discovery is complete. // Send a discovery complete event to the user application. raise_discov_complete = true; } else { // Begin discovery of descriptors for the next characteristic. uint32_t err_code; p_db_discovery->curr_char_ind++; err_code = descriptors_discover(p_db_discovery, &raise_discov_complete, p_ble_gattc_evt->conn_handle); if (err_code != NRF_SUCCESS) { p_db_discovery->discovery_in_progress = false; // Error with discovering the service. // Indicate the error to the registered user application. discovery_error_evt_trigger(p_db_discovery, err_code, p_ble_gattc_evt->conn_handle); m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE; m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle; return; } } if (raise_discov_complete) { NRF_LOG_DEBUG("Discovery of service with UUID 0x%x completed with success" " on connection handle 0x%x.", p_srv_being_discovered->srv_uuid.uuid, p_ble_gattc_evt->conn_handle); discovery_complete_evt_trigger(p_db_discovery, true, p_ble_gattc_evt->conn_handle); on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle); } } uint32_t ble_db_discovery_init(const ble_db_discovery_evt_handler_t evt_handler) { uint32_t err_code = NRF_SUCCESS; VERIFY_PARAM_NOT_NULL(evt_handler); m_num_of_handlers_reg = 0; m_initialized = true; m_pending_usr_evt_index = 0; m_evt_handler = evt_handler; return err_code; } uint32_t ble_db_discovery_close() { m_num_of_handlers_reg = 0; m_initialized = false; m_pending_usr_evt_index = 0; return NRF_SUCCESS; } uint32_t ble_db_discovery_evt_register(ble_uuid_t const * p_uuid) { VERIFY_PARAM_NOT_NULL(p_uuid); VERIFY_MODULE_INITIALIZED(); return registered_handler_set(p_uuid, m_evt_handler); } static uint32_t discovery_start(ble_db_discovery_t * const p_db_discovery, uint16_t conn_handle) { uint32_t err_code; ble_gatt_db_srv_t * p_srv_being_discovered; memset(p_db_discovery, 0x00, sizeof(ble_db_discovery_t)); p_db_discovery->conn_handle = conn_handle; m_pending_usr_evt_index = 0; p_db_discovery->discoveries_count = 0; p_db_discovery->curr_srv_ind = 0; p_db_discovery->curr_char_ind = 0; p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]); p_srv_being_discovered->srv_uuid = m_registered_handlers[p_db_discovery->curr_srv_ind]; NRF_LOG_DEBUG("Starting discovery of service with UUID 0x%x on connection handle 0x%x.", p_srv_being_discovered->srv_uuid.uuid, conn_handle); err_code = sd_ble_gattc_primary_services_discover(conn_handle, SRV_DISC_START_HANDLE, &(p_srv_being_discovered->srv_uuid)); if (err_code != NRF_ERROR_BUSY) { VERIFY_SUCCESS(err_code); p_db_discovery->discovery_in_progress = true; p_db_discovery->discovery_pending = false; } else { p_db_discovery->discovery_in_progress = true; p_db_discovery->discovery_pending = true; } return NRF_SUCCESS; } uint32_t ble_db_discovery_start(ble_db_discovery_t * const p_db_discovery, uint16_t conn_handle) { VERIFY_PARAM_NOT_NULL(p_db_discovery); VERIFY_MODULE_INITIALIZED(); if (m_num_of_handlers_reg == 0) { // No user modules were registered. There are no services to discover. return NRF_ERROR_INVALID_STATE; } if (p_db_discovery->discovery_in_progress) { return NRF_ERROR_BUSY; } return discovery_start(p_db_discovery, conn_handle); } /**@brief Function for handling disconnected event. * * @param[in] p_db_discovery Pointer to the DB Discovery structure. * @param[in] p_ble_gattc_evt Pointer to the GAP event. */ static void on_disconnected(ble_db_discovery_t * p_db_discovery, ble_gap_evt_t const * p_evt) { if (p_evt->conn_handle == p_db_discovery->conn_handle) { p_db_discovery->discovery_in_progress = false; p_db_discovery->discovery_pending = false; p_db_discovery->conn_handle = BLE_CONN_HANDLE_INVALID; } } void ble_db_discovery_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context) { VERIFY_PARAM_NOT_NULL_VOID(p_ble_evt); VERIFY_PARAM_NOT_NULL_VOID(p_context); VERIFY_MODULE_INITIALIZED_VOID(); //NRF_LOG_INFO("In ble_discovery_evt function"); ble_db_discovery_t * p_db_discovery = (ble_db_discovery_t *)p_context; switch (p_ble_evt->header.evt_id) { case BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP: NRF_LOG_INFO("Found services in............."); NRF_LOG_INFO("current discovery count:%d",p_db_discovery->discoveries_count); NRF_LOG_INFO("current service index: %d",p_db_discovery->curr_srv_ind); on_primary_srv_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt)); break; case BLE_GATTC_EVT_CHAR_DISC_RSP: on_characteristic_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt)); break; case BLE_GATTC_EVT_DESC_DISC_RSP: on_descriptor_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt)); break; case BLE_GAP_EVT_DISCONNECTED: on_disconnected(p_db_discovery, &(p_ble_evt->evt.gap_evt)); break; default: break; } if ( (p_db_discovery->discovery_pending) && (p_ble_evt->header.evt_id >= BLE_GATTC_EVT_BASE) && (p_ble_evt->header.evt_id <= BLE_GATTC_EVT_LAST) && (p_ble_evt->evt.gattc_evt.conn_handle == p_db_discovery->conn_handle)) { (void)discovery_start(p_db_discovery, p_db_discovery->conn_handle); } } #endif // NRF_MODULE_ENABLED(BLE_DB_DISCOVERY)