/** * Copyright (c) 2015 - 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. * */ /** @file coap_observe_api.h * * @defgroup iot_sdk_coap_observe CoAP Observe * @ingroup iot_sdk_coap * @{ * @brief Public API of Nordic's CoAP Observe implementation. */ #ifndef COAP_OBSERVE_API_H__ #define COAP_OBSERVE_API_H__ #include #include "coap_api.h" #include "coap_transport.h" #include "coap_queue.h" #include "compiler_abstraction.h" #include "sdk_errors.h" #ifdef __cplusplus extern "C" { #endif #define COAP_OPT_OBSERVE 6 /**< Observe option number. */ /**@brief Struct for CoAP Server for holding an instance of a remote observer. */ typedef struct { coap_remote_t remote; /**< Remote address and port number. */ uint8_t token[8]; /**< Message Token ID. */ uint8_t token_len; /**< Length of the token. */ coap_content_type_t ct; /**< Content type to use when sending notifications. */ coap_resource_t * p_resource_of_interest; /**< Pointer to the resource of interest. */ } coap_observer_t; /**@brief Struct for CoAP Client for holding an instance of a remote observable resource. */ typedef struct { coap_remote_t remote; /**< Remote address and port number. */ uint8_t token[8]; /**< Message Token ID. */ uint8_t token_len; /**< Length of the token. */ coap_response_callback_t response_callback; /**< Function callback set by the application to be called when a notifications has been received. Should be set by the application. */ uint32_t max_age; /**< Max-Age of the observable resources value. If timed out, the value is no longer valid as a representation of the observable resource. */ } coap_observable_t; /**@brief Register a new observer. * * @param[out] p_handle Handle to the observer instance registered. Returned by reference. * Should not be NULL. * @param[in] p_observer Pointer to the observer structure to register. The data will be * copied. Should not be NULL. * * @retval NRF_SUCCESS If the observer was registered successfully. * @retval NRF_ERROR_NO_MEM If the observer could not be added to the list. * @retval NRF_ERROR_NULL If one of the parameters is a NULL pointer. */ uint32_t coap_observe_server_register(uint32_t * p_handle, coap_observer_t * p_observer); /**@brief Unregister an observer. * * @details Unregister the observer and clear the memory used by this instance. * * @param[in] handle Handle to the observer instance registered. * * @retval NRF_SUCCESS If the observer was successfully unregistered. * @retval NRF_ERROR_NOT_FOUND If the given handle was not found in the observer list. */ uint32_t coap_observe_server_unregister(uint32_t handle); /**@brief Search the observer list for an observer matching remote address and subject given. * * @param[out] p_handle Handle to the observer instance registered. Returned by reference. * Should not be NULL. * @param[in] p_observer_addr Pointer to an address structure giving remote address of the observer and port number. * Should not be NULL. * @param[in] p_resource Pointer to the resource the observer is registered to. Should not be NULL. * * @retval NRF_SUCCESS If observer was found in the observer list. * @retval NRF_ERROR_NULL If one of the pointers are NULL. * @retval NRF_ERROR_NOT_FOUND If observer was not found. */ uint32_t coap_observe_server_search(uint32_t * p_handle, coap_remote_t * p_observer_addr, coap_resource_t * p_resource); /**@brief Iterate through observers subscribing to a specific resource. * * @param[out] pp_observer Pointer to be filled by the search function upon finding the next observer starting from * from the p_observer pointer provided. Should not be NULL. * @param[in] p_observer Pointer to the observer where to start the search. * @param[in] p_resource Pointer to the resource of interest. Should not be NULL. * * @retval NRF_SUCCESS If observer was found. * @retval NRF_ERROR_NULL If pp_observer or p_resource pointer is NULL. * @retval NRF_ERROR_NOT_FOUND If next observer was not found. */ uint32_t coap_observe_server_next_get(coap_observer_t ** pp_observer, coap_observer_t * p_observer, coap_resource_t * p_resource); /**@brief Retrieve the observer based on handle. * * @param[in] handle Handle to the coap_observer_t instance. * @param[out] pp_observer Pointer to an observer return by reference. * Should not be NULL. * * @retval NRF_SUCCESS If observer was found in the observer list. * @retval NRF_ERROR_NULL If pp_observer pointer is NULL. * @retval NRF_ERROR_NOT_FOUND If observer associated with the handle was not found. */ uint32_t coap_observe_server_get(uint32_t handle, coap_observer_t ** pp_observer); /**@brief Register a new observable resource. * * @param[out] p_handle Handle to the observable resource instance registered. Returned by * reference. Should not be NULL. * @param[in] p_observable Pointer to a observable resource structure to register. The structure * will be copied. Should not be NULL. * * @retval NRF_SUCCESS If the observable resource was registered successfully. * @retval NRF_ERROR_NO_MEM If the observable resource could not be added to the list. * @retval NRF_ERROR_NULL If one of the parameters is a NULL pointer. */ uint32_t coap_observe_client_register(uint32_t * p_handle, coap_observable_t * p_observable); /**@brief Unregister an observable resource. * * @details Unregister the observable resource and clear the memory used by this instance. * * @param[in] handle Handle to the observable resource instance registered. * * @retval NRF_SUCCESS If the observable resource was successfully unregistered. * @retval NRF_ERROR_NOT_FOUND If the given handle was not found in the observable * resource list. */ uint32_t coap_observe_client_unregister(uint32_t handle); /**@brief Search for a observable resource instance by token. * * @param[out] p_handle Handle to the observable resource instance registered. Returned by * reference. Should not be NULL. * @param[in] p_token Pointer to the byte array holding the token id. Should not be NULL. * @param[in] token_len Length of the token. * * @retval NRF_SUCCESS If observable resource was found in the observable * resource list. * @retval NRF_ERROR_NULL If one of the pointers are NULL. * @retval NRF_ERROR_NOT_FOUND If observable resource was not found in the observable * resource list. */ uint32_t coap_observe_client_search(uint32_t * p_handle, uint8_t * p_token, uint16_t token_len); /**@brief Retrieve the observable resource based on handle. * * @param[in] handle Handle to the coap_observable_t instance. * @param[out] pp_observable Pointer to an observable resource return by reference. * Should not be NULL. * * @retval NRF_SUCCESS If observable resource was found in the observable * resource list. * @retval NRF_ERROR_NULL If pp_observable pointer is NULL. * @retval NRF_ERROR_NOT_FOUND If observable resource associated with the handle * was not found. */ uint32_t coap_observe_client_get(uint32_t handle, coap_observable_t ** pp_observable); /**@brief Iterate through observable resources. * * @param[out] pp_observable Pointer to be filled by the search function upon finding the next * observable resource starting from from the pointer provided. * Should not be NULL. * @param[out] p_handle Handler to the observable resource found returned by reference. Should * not be NULL. * @param[in] p_observable Pointer to the observable resource where to start the search. * * @retval NRF_SUCCESS If observer was found. * @retval NRF_ERROR_NULL If pp_observer or p_observer pointer is NULL. * @retval NRF_ERROR_NOT_FOUND If next observer was not found. */ uint32_t coap_observe_client_next_get(coap_observable_t ** pp_observable, uint32_t * p_handle, coap_observable_t * p_observable); #ifdef __cplusplus } #endif #endif // COAP_OBSERVE_API_H__ /** @} */