/**@brief Function for handling BLE Stack events concerning central applications. * * @details This function keeps the connection handles of central applications up-to-date. It * parses scanning reports, initiating a connection attempt to peripherals when a target UUID * is found, and manages connection parameter update requests. Additionally, it updates the status * of LEDs used to report central applications activity. * * @note Since this function updates connection handles, @ref BLE_GAP_EVT_DISCONNECTED events * should be dispatched to the target application before invoking this function. * * @param[in] p_ble_evt Bluetooth stack event. */ static void on_ble_central_evt(const ble_evt_t * const p_ble_evt) { const ble_gap_evt_t * const p_gap_evt = &p_ble_evt->evt.gap_evt; switch (p_ble_evt->header.evt_id) { /** Upon connection, check which peripheral has connected (HR or RSC), initiate DB * discovery, update LEDs status and resume scanning if necessary. */ case BLE_GAP_EVT_CONNECTED: { uint32_t err_code; /** If no Heart Rate sensor or RSC sensor is currently connected, try to find them on this peripheral*/ if (m_conn_handle_hrs_c == BLE_CONN_HANDLE_INVALID) { NRF_LOG_PRINTF("try to find HRS or RSC on conn_handle 0x%x\r\n", p_gap_evt->conn_handle); APP_ERROR_CHECK_BOOL(p_gap_evt->conn_handle < CENTRAL_LINK_COUNT + PERIPHERAL_LINK_COUNT); err_code = ble_db_discovery_start(&m_ble_db_discovery[p_gap_evt->conn_handle], p_gap_evt->conn_handle); APP_ERROR_CHECK(err_code); } /** Update LEDs status, and check if we should be looking for more * peripherals to connect to. */ LEDS_ON(CENTRAL_CONNECTED_LED); if (ble_conn_state_n_centrals() == CENTRAL_LINK_COUNT) { LEDS_OFF(CENTRAL_SCANNING_LED); } else { // Resume scanning. LEDS_ON(CENTRAL_SCANNING_LED); scan_start(); } } break; // BLE_GAP_EVT_CONNECTED /** Upon disconnection, reset the connection handle of the peer which disconnected, update * the LEDs status and start scanning again. */ case BLE_GAP_EVT_DISCONNECTED: { uint8_t n_centrals; if (p_gap_evt->conn_handle == m_conn_handle_hrs_c) { NRF_LOG_PRINTF("HRS central disconnected (reason: %d)\r\n", p_gap_evt->params.disconnected.reason); m_conn_handle_hrs_c = BLE_CONN_HANDLE_INVALID; } if (m_conn_handle_hrs_c == BLE_CONN_HANDLE_INVALID) { // Start scanning scan_start(); // Update LEDs status. LEDS_ON(CENTRAL_SCANNING_LED); } n_centrals = ble_conn_state_n_centrals(); if (n_centrals == 0) { LEDS_OFF(CENTRAL_CONNECTED_LED); } } break; // BLE_GAP_EVT_DISCONNECTED case BLE_GAP_EVT_ADV_REPORT: { uint32_t err_code; if (strlen(m_target_periph_name) != 0) { if (find_adv_name(&p_gap_evt->params.adv_report, m_target_periph_name)) { // Initiate connection. err_code = sd_ble_gap_connect(&p_gap_evt->params.adv_report.peer_addr, &m_scan_param, &m_connection_param); if (err_code != NRF_SUCCESS) { APPL_LOG("[APPL]: Connection Request Failed, reason %d\r\n", err_code); } } } else { /** We do not want to connect to two peripherals offering the same service, so when * a UUID is matched, we check that we are not already connected to a peer which * offers the same service. */ if (find_adv_uuid(&p_gap_evt->params.adv_report, BLE_UUID_HEART_RATE_SERVICE)&& (m_conn_handle_hrs_c == BLE_CONN_HANDLE_INVALID)) { // Initiate connection. err_code = sd_ble_gap_connect(&p_gap_evt->params.adv_report.peer_addr, &m_scan_param, &m_connection_param); if (err_code != NRF_SUCCESS) { APPL_LOG("[APPL]: Connection Request Failed, reason %d\r\n", err_code); } } } } break; // BLE_GAP_ADV_REPORT case BLE_GAP_EVT_TIMEOUT: { // We have not specified a timeout for scanning, so only connection attemps can timeout. if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN) { APPL_LOG("[APPL]: Connection Request timed out.\r\n"); } } break; // BLE_GAP_EVT_TIMEOUT case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST: { // Accept parameters requested by peer. ret_code_t err_code; err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle, &p_gap_evt->params.conn_param_update_request.conn_params); APP_ERROR_CHECK(err_code); } break; // BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST default: // No implementation needed. break; } }
/**@brief Function for handling BLE Stack events concerning central applications. * * @details This function keeps the connection handles of central applications up-to-date. It * parses scanning reports, initiating a connection attempt to peripherals when a * target UUID is found, and manages connection parameter update requests. Additionally, * it updates the status of LEDs used to report central applications activity. * * @note Since this function updates connection handles, @ref BLE_GAP_EVT_DISCONNECTED events * should be dispatched to the target application before invoking this function. * * @param[in] p_ble_evt Bluetooth stack event. */ static void on_ble_evt(const ble_evt_t * const p_ble_evt) { // For readability. const ble_gap_evt_t * const p_gap_evt = &p_ble_evt->evt.gap_evt; switch (p_ble_evt->header.evt_id) { // Upon connection, check which peripheral has connected, initiate DB // discovery, update LEDs status and resume scanning if necessary. case BLE_GAP_EVT_CONNECTED: { uint32_t err_code; NRF_LOG_PRINTF("[APP]: link 0x%x established, start discovery on it\r\n", p_gap_evt->conn_handle); APP_ERROR_CHECK_BOOL(p_gap_evt->conn_handle < TOTAL_LINK_COUNT); err_code = ble_lbs_c_handles_assign(&m_ble_lbs_c[p_gap_evt->conn_handle], p_gap_evt->conn_handle, NULL); APP_ERROR_CHECK(err_code); err_code = ble_db_discovery_start(&m_ble_db_discovery[p_gap_evt->conn_handle], p_gap_evt->conn_handle); if (err_code != NRF_ERROR_BUSY) { APP_ERROR_CHECK(err_code); } // Update LEDs status, and check if we should be looking for more // peripherals to connect to. LEDS_ON(CENTRAL_CONNECTED_LED); if (ble_conn_state_n_centrals() == CENTRAL_LINK_COUNT) { LEDS_OFF(CENTRAL_SCANNING_LED); } else { // Resume scanning. LEDS_ON(CENTRAL_SCANNING_LED); scan_start(); } } break; // BLE_GAP_EVT_CONNECTED // Upon disconnection, reset the connection handle of the peer which disconnected, update // the LEDs status and start scanning again. case BLE_GAP_EVT_DISCONNECTED: { uint32_t central_link_cnt; // Number of central links. NRF_LOG_PRINTF("LBS central link 0x%x disconnected (reason: %d)\r\n", p_gap_evt->conn_handle, p_gap_evt->params.disconnected.reason); uint32_t err_code = app_button_disable(); APP_ERROR_CHECK(err_code); // Start scanning scan_start(); // Update LEDs status. LEDS_ON(CENTRAL_SCANNING_LED); central_link_cnt = ble_conn_state_n_centrals(); if (central_link_cnt == 0) { LEDS_OFF(CENTRAL_CONNECTED_LED); } } break; // BLE_GAP_EVT_DISCONNECTED case BLE_GAP_EVT_ADV_REPORT: on_adv_report(p_ble_evt); break; // BLE_GAP_ADV_REPORT case BLE_GAP_EVT_TIMEOUT: { // We have not specified a timeout for scanning, so only connection attemps can timeout. if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN) { APPL_LOG("[APPL]: Connection Request timed out.\r\n"); } } break; // BLE_GAP_EVT_TIMEOUT case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST: { // Accept parameters requested by peer. ret_code_t err_code; err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle, &p_gap_evt->params.conn_param_update_request.conn_params); APP_ERROR_CHECK(err_code); } break; // BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST default: // No implementation needed. break; } }
/**@brief Function for handling BLE Stack events concerning central applications. * * @details This function keeps the connection handles of central applications up-to-date. It * parses scanning reports, initiating a connection attempt to peripherals when a target UUID * is found, and manages connection parameter update requests. Additionally, it updates the status * of LEDs used to report central applications activity. * * @note Since this function updates connection handles, @ref BLE_GAP_EVT_DISCONNECTED events * should be dispatched to the target application before invoking this function. * * @param[in] p_ble_evt Bluetooth stack event. */ static void on_ble_central_evt(const ble_evt_t * const p_ble_evt) { // The addresses of peers we attempted to connect to. static ble_gap_addr_t periph_addr_hrs; static ble_gap_addr_t periph_addr_rsc; // For readability. const ble_gap_evt_t * const p_gap_evt = &p_ble_evt->evt.gap_evt; switch (p_ble_evt->header.evt_id) { /** Upon connection, check which peripheral has connected (HR or RSC), initiate DB * discovery, update LEDs status and resume scanning if necessary. */ case BLE_GAP_EVT_CONNECTED: { uint32_t err_code; // For readability. const ble_gap_addr_t * const peer_addr = &p_gap_evt->params.connected.peer_addr; /** Check which peer has connected, save the connection handle and initiate DB discovery. * DB discovery will invoke a callback (hrs_c_evt_handler and rscs_c_evt_handler) * upon completion, which is used to enable notifications from the peer. */ if(memcmp(&periph_addr_hrs, peer_addr, sizeof(ble_gap_addr_t)) == 0) { NRF_LOG_PRINTF("HRS central connected\r\n"); // Reset the peer address we had saved. memset(&periph_addr_hrs, 0, sizeof(ble_gap_addr_t)); m_conn_handle_hrs_c = p_gap_evt->conn_handle; NRF_LOG_PRINTF("Starting DB discovery for HRS\r\n"); err_code = ble_db_discovery_start(&m_ble_db_discovery_hrs, p_gap_evt->conn_handle); APP_ERROR_CHECK(err_code); } else if(memcmp(&periph_addr_rsc, peer_addr, sizeof(ble_gap_addr_t)) == 0) { NRF_LOG_PRINTF("RSC central connected\r\n"); // Reset the peer address we had saved. memset(&periph_addr_rsc, 0, sizeof(ble_gap_addr_t)); m_conn_handle_rscs_c = p_gap_evt->conn_handle; NRF_LOG_PRINTF("Starting DB discovery for RSCS\r\n"); err_code = ble_db_discovery_start(&m_ble_db_discovery_rsc, p_gap_evt->conn_handle); APP_ERROR_CHECK(err_code); } /** Update LEDs status, and check if we should be looking for more * peripherals to connect to. */ LEDS_ON(CENTRAL_CONNECTED_LED); if (ble_conn_state_n_centrals() == MAX_CONNECTED_CENTRALS) { LEDS_OFF(CENTRAL_SCANNING_LED); } else { // Resume scanning. LEDS_ON(CENTRAL_SCANNING_LED); scan_start(); } } break; // BLE_GAP_EVT_CONNECTED /** Upon disconnection, reset the connection handle of the peer which disconnected, update * the LEDs status and start scanning again. */ case BLE_GAP_EVT_DISCONNECTED: { uint8_t n_centrals; if (p_gap_evt->conn_handle == m_conn_handle_hrs_c) { NRF_LOG_PRINTF("HRS central disconnected (reason: %d)\r\n", p_gap_evt->params.disconnected.reason); m_conn_handle_hrs_c = BLE_CONN_HANDLE_INVALID; } else if(p_gap_evt->conn_handle == m_conn_handle_rscs_c) { NRF_LOG_PRINTF("RSC central disconnected (reason: %d)\r\n", p_gap_evt->params.disconnected.reason); m_conn_handle_rscs_c = BLE_CONN_HANDLE_INVALID; } // Start scanning // scan_start(); // Update LEDs status. LEDS_ON(CENTRAL_SCANNING_LED); n_centrals = ble_conn_state_n_centrals(); if (n_centrals == 0) { LEDS_OFF(CENTRAL_CONNECTED_LED); } } break; // BLE_GAP_EVT_DISCONNECTED case BLE_GAP_EVT_ADV_REPORT: { uint32_t err_code; data_t adv_data; data_t type_data; // For readibility. const ble_gap_addr_t * const peer_addr = &p_gap_evt->params.adv_report.peer_addr; // Initialize advertisement report for parsing. adv_data.p_data = (uint8_t *)p_gap_evt->params.adv_report.data; adv_data.data_len = p_gap_evt->params.adv_report.dlen; err_code = adv_report_parse(BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_MORE_AVAILABLE, &adv_data, &type_data); if (err_code != NRF_SUCCESS) { // Look for the services in 'complete' if it was not found in 'more available'. err_code = adv_report_parse(BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_COMPLETE, &adv_data, &type_data); if (err_code != NRF_SUCCESS) { // If we can't parse the data, then exit. break; } } // Verify if any UUID match the Heart rate or Running speed and cadence services. for (uint32_t u_index = 0; u_index < (type_data.data_len / UUID16_SIZE); u_index++) { bool do_connect = false; uint16_t extracted_uuid; UUID16_EXTRACT(&extracted_uuid, &type_data.p_data[u_index * UUID16_SIZE]); /** We do not want to connect to two peripherals offering the same service, so when * a UUID is matched, we check that we are not already connected to a peer which * offers the same service. We then save the peer address, so that upon connection * we can tell which peer has connected and update its respective connection * handle. */ if ((extracted_uuid == BLE_UUID_HEART_RATE_SERVICE) && (m_conn_handle_hrs_c == BLE_CONN_HANDLE_INVALID)) { do_connect = true; memcpy(&periph_addr_hrs, peer_addr, sizeof(ble_gap_addr_t)); } else if ((extracted_uuid == BLE_UUID_RUNNING_SPEED_AND_CADENCE) && (m_conn_handle_rscs_c == BLE_CONN_HANDLE_INVALID)) { do_connect = true; memcpy(&periph_addr_rsc, peer_addr, sizeof(ble_gap_addr_t)); } if (do_connect) { // Initiate connection. err_code = sd_ble_gap_connect(peer_addr, &m_scan_param, &m_connection_param); if (err_code != NRF_SUCCESS) { APPL_LOG("[APPL]: Connection Request Failed, reason %d\r\n", err_code); } } } } break; // BLE_GAP_ADV_REPORT case BLE_GAP_EVT_TIMEOUT: { // We have not specified a timeout for scanning, so only connection attemps can timeout. if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN) { APPL_LOG("[APPL]: Connection Request timed out.\r\n"); } } break; // BLE_GAP_EVT_TIMEOUT case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST: { // Accept parameters requested by peer. ret_code_t err_code; err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle, &p_gap_evt->params.conn_param_update_request.conn_params); APP_ERROR_CHECK(err_code); } break; // BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST default: // No implementation needed. break; } }