317 lines
10 KiB
C
317 lines
10 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef __ESP_NOW_H__
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#define __ESP_NOW_H__
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#include <stdbool.h>
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#include "esp_err.h"
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#include "esp_wifi_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \defgroup WiFi_APIs WiFi Related APIs
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* @brief WiFi APIs
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*/
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/** @addtogroup WiFi_APIs
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* @{
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*/
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/** \defgroup ESPNOW_APIs ESPNOW APIs
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* @brief ESP32 ESPNOW APIs
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*
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*/
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/** @addtogroup ESPNOW_APIs
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* @{
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*/
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#define ESP_ERR_ESPNOW_BASE (ESP_ERR_WIFI_BASE + 101) /*!< ESPNOW error number base. */
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#define ESP_ERR_ESPNOW_NOT_INIT (ESP_ERR_ESPNOW_BASE) /*!< ESPNOW is not initialized. */
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#define ESP_ERR_ESPNOW_ARG (ESP_ERR_ESPNOW_BASE + 1) /*!< Invalid argument */
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#define ESP_ERR_ESPNOW_NO_MEM (ESP_ERR_ESPNOW_BASE + 2) /*!< Out of memory */
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#define ESP_ERR_ESPNOW_FULL (ESP_ERR_ESPNOW_BASE + 3) /*!< ESPNOW peer list is full */
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#define ESP_ERR_ESPNOW_NOT_FOUND (ESP_ERR_ESPNOW_BASE + 4) /*!< ESPNOW peer is not found */
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#define ESP_ERR_ESPNOW_INTERNAL (ESP_ERR_ESPNOW_BASE + 5) /*!< Internal error */
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#define ESP_ERR_ESPNOW_EXIST (ESP_ERR_ESPNOW_BASE + 6) /*!< ESPNOW peer has existed */
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#define ESP_ERR_ESPNOW_IF (ESP_ERR_ESPNOW_BASE + 7) /*!< Interface error */
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#define ESP_NOW_ETH_ALEN 6 /*!< Length of ESPNOW peer MAC address */
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#define ESP_NOW_KEY_LEN 16 /*!< Length of ESPNOW peer local master key */
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#define ESP_NOW_MAX_TOTAL_PEER_NUM 20 /*!< Maximum number of ESPNOW total peers */
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#define ESP_NOW_MAX_ENCRYPT_PEER_NUM 6 /*!< Maximum number of ESPNOW encrypted peers */
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#define ESP_NOW_MAX_DATA_LEN 250 /*!< Maximum length of ESPNOW data which is sent very time */
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/**
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* @brief Status of sending ESPNOW data .
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*/
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typedef enum {
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ESP_NOW_SEND_SUCCESS = 0, /**< Send ESPNOW data successfully */
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ESP_NOW_SEND_FAIL, /**< Send ESPNOW data fail */
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} esp_now_send_status_t;
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/**
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* @brief ESPNOW peer information parameters.
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*/
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typedef struct esp_now_peer_info {
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uint8_t peer_addr[ESP_NOW_ETH_ALEN]; /**< ESPNOW peer MAC address that is also the MAC address of station or softap */
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uint8_t lmk[ESP_NOW_KEY_LEN]; /**< ESPNOW peer local master key that is used to encrypt data */
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uint8_t channel; /**< Wi-Fi channel that peer uses to send/receive ESPNOW data. If the value is 0,
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use the current channel which station or softap is on. Otherwise, it must be
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set as the channel that station or softap is on. */
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wifi_interface_t ifidx; /**< Wi-Fi interface that peer uses to send/receive ESPNOW data */
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bool encrypt; /**< ESPNOW data that this peer sends/receives is encrypted or not */
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void *priv; /**< ESPNOW peer private data */
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} esp_now_peer_info_t;
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/**
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* @brief Number of ESPNOW peers which exist currently.
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*/
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typedef struct esp_now_peer_num {
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int total_num; /**< Total number of ESPNOW peers, maximum value is ESP_NOW_MAX_TOTAL_PEER_NUM */
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int encrypt_num; /**< Number of encrypted ESPNOW peers, maximum value is ESP_NOW_MAX_ENCRYPT_PEER_NUM */
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} esp_now_peer_num_t;
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/**
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* @brief Callback function of receiving ESPNOW data
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* @param mac_addr peer MAC address
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* @param data received data
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* @param data_len length of received data
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*/
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typedef void (*esp_now_recv_cb_t)(const uint8_t *mac_addr, const uint8_t *data, int data_len);
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/**
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* @brief Callback function of sending ESPNOW data
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* @param mac_addr peer MAC address
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* @param status status of sending ESPNOW data (succeed or fail)
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*/
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typedef void (*esp_now_send_cb_t)(const uint8_t *mac_addr, esp_now_send_status_t status);
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/**
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* @brief Initialize ESPNOW function
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_INTERNAL : Internal error
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*/
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esp_err_t esp_now_init(void);
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/**
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* @brief De-initialize ESPNOW function
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*
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* @return
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* - ESP_OK : succeed
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*/
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esp_err_t esp_now_deinit(void);
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/**
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* @brief Get the version of ESPNOW
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*
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* @param version ESPNOW version
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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*/
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esp_err_t esp_now_get_version(uint32_t *version);
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/**
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* @brief Register callback function of receiving ESPNOW data
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*
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* @param cb callback function of receiving ESPNOW data
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_INTERNAL : internal error
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*/
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esp_err_t esp_now_register_recv_cb(esp_now_recv_cb_t cb);
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/**
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* @brief Unregister callback function of receiving ESPNOW data
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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*/
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esp_err_t esp_now_unregister_recv_cb(void);
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/**
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* @brief Register callback function of sending ESPNOW data
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*
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* @param cb callback function of sending ESPNOW data
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_INTERNAL : internal error
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*/
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esp_err_t esp_now_register_send_cb(esp_now_send_cb_t cb);
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/**
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* @brief Unregister callback function of sending ESPNOW data
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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*/
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esp_err_t esp_now_unregister_send_cb(void);
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/**
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* @brief Send ESPNOW data
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*
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* @attention 1. If peer_addr is not NULL, send data to the peer whose MAC address matches peer_addr
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* @attention 2. If peer_addr is NULL, send data to all of the peers that are added to the peer list
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* @attention 3. The maximum length of data must be less than ESP_NOW_MAX_DATA_LEN
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* @attention 4. The buffer pointed to by data argument does not need to be valid after esp_now_send returns
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*
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* @param peer_addr peer MAC address
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* @param data data to send
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* @param len length of data
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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* - ESP_ERR_ESPNOW_INTERNAL : internal error
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* - ESP_ERR_ESPNOW_NO_MEM : out of memory
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* - ESP_ERR_ESPNOW_NOT_FOUND : peer is not found
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* - ESP_ERR_ESPNOW_IF : current WiFi interface doesn't match that of peer
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*/
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esp_err_t esp_now_send(const uint8_t *peer_addr, const uint8_t *data, size_t len);
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/**
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* @brief Add a peer to peer list
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*
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* @param peer peer information
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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* - ESP_ERR_ESPNOW_FULL : peer list is full
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* - ESP_ERR_ESPNOW_NO_MEM : out of memory
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* - ESP_ERR_ESPNOW_EXIST : peer has existed
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*/
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esp_err_t esp_now_add_peer(const esp_now_peer_info_t *peer);
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/**
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* @brief Delete a peer from peer list
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*
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* @param peer_addr peer MAC address
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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* - ESP_ERR_ESPNOW_NOT_FOUND : peer is not found
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*/
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esp_err_t esp_now_del_peer(const uint8_t *peer_addr);
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/**
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* @brief Modify a peer
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*
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* @param peer peer information
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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* - ESP_ERR_ESPNOW_FULL : peer list is full
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*/
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esp_err_t esp_now_mod_peer(const esp_now_peer_info_t *peer);
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/**
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* @brief Get a peer whose MAC address matches peer_addr from peer list
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*
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* @param peer_addr peer MAC address
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* @param peer peer information
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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* - ESP_ERR_ESPNOW_NOT_FOUND : peer is not found
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*/
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esp_err_t esp_now_get_peer(const uint8_t *peer_addr, esp_now_peer_info_t *peer);
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/**
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* @brief Fetch a peer from peer list
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*
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* @param from_head fetch from head of list or not
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* @param peer peer information
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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* - ESP_ERR_ESPNOW_NOT_FOUND : peer is not found
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*/
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esp_err_t esp_now_fetch_peer(bool from_head, esp_now_peer_info_t *peer);
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/**
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* @brief Peer exists or not
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*
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* @param peer_addr peer MAC address
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*
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* @return
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* - true : peer exists
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* - false : peer not exists
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*/
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bool esp_now_is_peer_exist(const uint8_t *peer_addr);
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/**
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* @brief Get the number of peers
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*
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* @param num number of peers
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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*/
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esp_err_t esp_now_get_peer_num(esp_now_peer_num_t *num);
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/**
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* @brief Set the primary master key
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*
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* @param pmk primary master key
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*
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* @attention 1. primary master key is used to encrypt local master key
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*
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* @return
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* - ESP_OK : succeed
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* - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized
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* - ESP_ERR_ESPNOW_ARG : invalid argument
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*/
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esp_err_t esp_now_set_pmk(const uint8_t *pmk);
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/**
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* @}
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*/
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ESP_NOW_H__ */
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