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Diff: source/nordic_sdk/components/ble/common/ble_conn_state.h
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diff -r 000000000000 -r bc2961fa1ef0 source/nordic_sdk/components/ble/common/ble_conn_state.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/source/nordic_sdk/components/ble/common/ble_conn_state.h Wed Apr 06 23:55:04 2016 +0100 @@ -0,0 +1,287 @@ +/* + * Copyright (c) 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 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 other + * contributors to this software may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT HOLDER 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. + * + */ + +/** + * @file + * + * @defgroup ble_conn_state Connection state + * @ingroup ble_sdk_lib + * @{ + * @brief Module for storing data on BLE connections. + * + * @details This module stores certain states for each connection, which can be queried by + * connection handle. The module uses BLE events to keep the states updated. + * + * In addition to the preprogrammed states, this module can also keep track of a number of + * binary user states, or <i>user flags</i>. These are reset to 0 for new connections, but + * otherwise not touched by this module. + * + * This module uses the @ref sdk_mapped_flags module, with connection handles as keys and + * the connection states as flags. + * + * @note A connection handle is not immediately invalidated when it is disconnected. Certain states, + * such as the role, can still be queried until the next time a new connection is established + * to any device. + * + * To function properly, this module must be provided with BLE events from the SoftDevice + * through the @ref ble_conn_state_on_ble_evt() function. This module should be the first + * to receive BLE events if they are dispatched to multiple modules. + */ + +#ifndef BLE_CONN_STATE_H__ +#define BLE_CONN_STATE_H__ + +#include <stdbool.h> +#include <stdint.h> +#include "ble.h" +#include "sdk_mapped_flags.h" + +/**@brief Connection handle statuses. + */ +typedef enum +{ + BLE_CONN_STATUS_INVALID, /**< The connection handle is invalid. */ + BLE_CONN_STATUS_DISCONNECTED, /**< The connection handle refers to a connection that has been disconnected, but not yet invalidated. */ + BLE_CONN_STATUS_CONNECTED, /**< The connection handle refers to an active connection. */ +} ble_conn_state_status_t; + +#define BLE_CONN_STATE_N_USER_FLAGS 16 /**< The number of available user flags. */ + + +/**@brief One ID for each user flag collection. + * + * @details These IDs are used to identify user flag collections in the API calls. + */ +typedef enum +{ + BLE_CONN_STATE_USER_FLAG0 = 0, + BLE_CONN_STATE_USER_FLAG1, + BLE_CONN_STATE_USER_FLAG2, + BLE_CONN_STATE_USER_FLAG3, + BLE_CONN_STATE_USER_FLAG4, + BLE_CONN_STATE_USER_FLAG5, + BLE_CONN_STATE_USER_FLAG6, + BLE_CONN_STATE_USER_FLAG7, + BLE_CONN_STATE_USER_FLAG8, + BLE_CONN_STATE_USER_FLAG9, + BLE_CONN_STATE_USER_FLAG10, + BLE_CONN_STATE_USER_FLAG11, + BLE_CONN_STATE_USER_FLAG12, + BLE_CONN_STATE_USER_FLAG13, + BLE_CONN_STATE_USER_FLAG14, + BLE_CONN_STATE_USER_FLAG15, + BLE_CONN_STATE_USER_FLAG_INVALID, +} ble_conn_state_user_flag_id_t; + + +/** + * @defgroup ble_conn_state_functions BLE connection state functions + * @{ + */ + + +/**@brief Function for initializing or resetting the module. + * + * @details This function sets all states to their default, removing all records of connection handles. + */ +void ble_conn_state_init(void); + + +/**@brief Function for providing BLE SoftDevice events to the connection state module. + * + * @param[in] p_ble_evt The SoftDevice event. + */ +void ble_conn_state_on_ble_evt(ble_evt_t * p_ble_evt); + + +/**@brief Function for querying whether a connection handle represents a valid connection. + * + * @details A connection might be valid and have a BLE_CONN_STATUS_DISCONNECTED status. + * Those connections are invalidated after a new connection occurs. + * + * @param[in] conn_handle Handle of the connection. + * + * @retval true If conn_handle represents a valid connection, thus a connection for which + we have a record. + * @retval false If conn_handle is @ref BLE_GAP_ROLE_INVALID, or if it has never been recorded. + */ +bool ble_conn_state_valid(uint16_t conn_handle); + + +/**@brief Function for querying the role of the local device in a connection. + * + * @param[in] conn_handle Handle of the connection to get the role for. + * + * @return The role of the local device in the connection (see @ref BLE_GAP_ROLES). + * If conn_handle is not valid, the function returns BLE_GAP_ROLE_INVALID. + */ +uint8_t ble_conn_state_role(uint16_t conn_handle); + + +/**@brief Function for querying the status of a connection. + * + * @param[in] conn_handle Handle of the connection. + * + * @return The status of the connection. + * If conn_handle is not valid, the function returns BLE_CONN_STATE_INVALID. + */ +ble_conn_state_status_t ble_conn_state_status(uint16_t conn_handle); + + +/**@brief Function for querying whether a connection is encrypted. + * + * @param[in] conn_handle Handle of connection to get the encryption state for. + * + * @retval true If the connection is encrypted. + * @retval false If the connection is not encrypted or conn_handle is invalid. + */ +bool ble_conn_state_encrypted(uint16_t conn_handle); + + +/**@brief Function for querying whether a connection encryption is protected from Man in the Middle + * attacks. + * + * @param[in] conn_handle Handle of connection to get the MITM state for. + * + * @retval true If the connection is encrypted with MITM protection. + * @retval false If the connection is not encrypted, or encryption is not MITM protected, or + * conn_handle is invalid. + */ +bool ble_conn_state_mitm_protected(uint16_t conn_handle); + + +/**@brief Function for querying the total number of connections. + * + * @return The total number of valid connections for which the module has a record. + */ +uint32_t ble_conn_state_n_connections(void); + + +/**@brief Function for querying the total number of connections in which the role of the local + * device is @ref BLE_GAP_ROLE_CENTRAL. + * + * @return The number of connections in which the role of the local device is + * @ref BLE_GAP_ROLE_CENTRAL. + */ +uint32_t ble_conn_state_n_centrals(void); + + +/**@brief Function for querying the total number of connections in which the role of the local + * device is @ref BLE_GAP_ROLE_PERIPH. + * + * @return The number of connections in which the role of the local device is + * @ref BLE_GAP_ROLE_PERIPH. + */ +uint32_t ble_conn_state_n_peripherals(void); + + +/**@brief Function for obtaining a list of all connection handles for which the module has a record. + * + * @details This function takes into account connections whose state is BLE_CONN_STATUS_DISCONNECTED. + * + * @return A list of all valid connection handles for which the module has a record. + */ +sdk_mapped_flags_key_list_t ble_conn_state_conn_handles(void); + + +/**@brief Function for obtaining a list of connection handles in which the role of the local + * device is @ref BLE_GAP_ROLE_CENTRAL. + * + * @details This function takes into account connections whose state is BLE_CONN_STATUS_DISCONNECTED. + * + * @return A list of all valid connection handles for which the module has a record and in which + * the role of local device is @ref BLE_GAP_ROLE_CENTRAL. + */ +sdk_mapped_flags_key_list_t ble_conn_state_central_handles(void); + + +/**@brief Function for obtaining the handle for the connection in which the role of the local device + * is @ref BLE_GAP_ROLE_PERIPH. + * + * @details This function takes into account connections whose state is BLE_CONN_STATUS_DISCONNECTED. + * + * @return A list of all valid connection handles for which the module has a record and in which + * the role of local device is @ref BLE_GAP_ROLE_PERIPH. + */ +sdk_mapped_flags_key_list_t ble_conn_state_periph_handles(void); + + +/**@brief Function for obtaining exclusive access to one of the user flag collections. + * + * @details The acquired collection contains one flag for each connection. These flags can be set + * and read individually for each connection. + * + * The state of user flags will not be modified by the connection state module, except to + * set it to 0 for a connection when that connection is invalidated. + * + * @return The ID of the acquired flag, or BLE_CONN_STATE_USER_FLAG_INVALID if none are available. + */ +ble_conn_state_user_flag_id_t ble_conn_state_user_flag_acquire(void); + + +/**@brief Function for reading the value of a user flag. + * + * @param[in] conn_handle Handle of connection to get the flag state for. + * @param[in] flag_id Which flag to get the state for. + * + * @return The state of the flag. If conn_handle is invalid, the function returns false. + */ +bool ble_conn_state_user_flag_get(uint16_t conn_handle, ble_conn_state_user_flag_id_t flag_id); + + +/**@brief Function for setting the value of a user flag. + * + * @param[in] conn_handle Handle of connection to set the flag state for. + * @param[in] flag_id Which flag to set the state for. + * @param[in] value Value to set the flag state to. + */ +void ble_conn_state_user_flag_set(uint16_t conn_handle, + ble_conn_state_user_flag_id_t flag_id, + bool value); + + +/**@brief Function for getting the state of a user flag for all connection handles. + * + * @details The returned collection can be used with the @ref sdk_mapped_flags API. The returned + * collection is a copy, so modifying it has no effect on the conn_state module. + * + * @param[in] flag_id Which flag to get states for. + * + * @return The collection of flag states. The collection is always all zeros when the flag_id is + * unregistered. + */ +sdk_mapped_flags_t ble_conn_state_user_flag_collection(ble_conn_state_user_flag_id_t flag_id); + +/** @} */ +/** @} */ + +#endif /* BLE_CONN_STATE_H__ */