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/*
* ESPRSSIF MIT License
*
* Copyright (c) 2015 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
*
* Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
* it is free of charge, to any person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished
* to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef __ESPNOW_H__
#define __ESPNOW_H__
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup ESPNow_APIs ESP-NOW APIs
* @brief ESP-NOW APIs
*
* @attention 1. ESP-NOW do not support broadcast and multicast.
* @attention 2. ESP-NOW is targeted to Smart-Light project, so it is suggested
* that slave role corresponding to soft-AP or soft-AP+station mode,
* controller role corresponding to station mode.
* @attention 3. When ESP8266 is in soft-AP+station mode, it will communicate through
* station interface if it is in slave role, and communicate through
* soft-AP interface if it is in controller role.
* @attention 4. ESP-NOW can not wake ESP8266 up from sleep, so if the target ESP8266
* station is in sleep, ESP-NOW communication will fail.
* @attention 5. In station mode, ESP8266 supports 10 encrypt ESP-NOW peers at most,
* with the unencrypted peers, it can be 20 peers in total at most.
* @attention 6. In the soft-AP mode or soft-AP + station mode, the ESP8266 supports
* 6 encrypt ESP-NOW peers at most, with the unencrypted peers, it can
* be 20 peers in total at most.
*
*/
/** @addtogroup ESPNow_APIs
* @{
*/
enum esp_now_role {
ESP_NOW_ROLE_IDLE = 0,
ESP_NOW_ROLE_CONTROLLER,
ESP_NOW_ROLE_SLAVE,
ESP_NOW_ROLE_MAX,
};
/**
* @brief ESP-NOW send callback.
*
* @attention The status will be OK, if ESP-NOW send packet successfully. But users
* need to make sure by themselves that key of communication is correct.
*
* @param uint8 *mac_addr : MAC address of target device
* @param uint8 *data : data received
* @param uint8 len : data length
*
* @return null
*/
typedef void (*esp_now_recv_cb_t)(uint8 *mac_addr, uint8 *data, uint8 len);
/**
* @brief ESP-NOW send callback.
*
* @attention The status will be OK, if ESP-NOW send packet successfully. But users
* need to make sure by themselves that key of communication is correct.
*
* @param uint8 *mac_addr : MAC address of target device
* @param uint8 status : status of ESP-NOW sending packet, 0, OK; 1, fail.
*
* @return null
*/
typedef void (*esp_now_send_cb_t)(uint8 *mac_addr, uint8 status);
/**
* @brief ESP-NOW initialization.
*
* @param null
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_init(void);
/**
* @brief Deinitialize ESP-NOW.
*
* @param null
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_deinit(void);
/**
* @brief Register ESP-NOW send callback.
*
* @param esp_now_send_cb_t cb : send callback
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_register_send_cb(esp_now_send_cb_t cb);
/**
* @brief Unregister ESP-NOW send callback.
*
* @param null
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_unregister_send_cb(void);
/**
* @brief Register ESP-NOW receive callback.
*
* @param esp_now_recv_cb_t cb : receive callback
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_register_recv_cb(esp_now_recv_cb_t cb);
/**
* @brief Unregister ESP-NOW receive callback.
*
* @param null
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_unregister_recv_cb(void);
/**
* @brief Send ESP-NOW packet.
*
* @param uint8 *da : destination MAC address.
* If it's NULL, send packet to all MAC addresses recorded
* by ESP-NOW; otherwise, send packet to target MAC address.
* @param uint8 *data : data need to send
* @param uint8 len : data length
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_send(uint8 *da, uint8 *data, uint8 len);
/**
* @brief Add an ESP-NOW peer, store MAC address of target device into ESP-NOW MAC list.
*
* @param uint8 *mac_addr : MAC address of device
* @param uint8 role : role type of device, enum esp_now_role
* @param uint8 channel : channel of device
* @param uint8 *key : 16 bytes key which is needed for ESP-NOW communication
* @param uint8 key_len : length of key, has to be 16 bytes now
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_add_peer(uint8 *mac_addr, uint8 role, uint8 channel, uint8 *key, uint8 key_len);
/**
* @brief Delete an ESP-NOW peer, delete MAC address of the device from ESP-NOW MAC list.
*
* @param u8 *mac_addr : MAC address of device
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_del_peer(uint8 *mac_addr);
/**
* @brief Set ESP-NOW role of device itself.
*
* @param uint8 role : role type of device, enum esp_now_role.
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_set_self_role(uint8 role);
/**
* @brief Get ESP-NOW role of device itself.
*
* @param uint8 role : role type of device, enum esp_now_role.
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_get_self_role(void);
/**
* @brief Set ESP-NOW role for a target device. If it is set multiple times,
* new role will cover the old one.
*
* @param uint8 *mac_addr : MAC address of device.
* @param uint8 role : role type, enum esp_now_role.
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_set_peer_role(uint8 *mac_addr, uint8 role);
/**
* @brief Get ESP-NOW role of a target device.
*
* @param uint8 *mac_addr : MAC address of device.
*
* @return ESP_NOW_ROLE_CONTROLLER, role type : controller
* @return ESP_NOW_ROLE_SLAVE, role type : slave
* @return otherwise : fail
*/
sint32 esp_now_get_peer_role(uint8 *mac_addr);
/**
* @brief Record channel information of a ESP-NOW device.
*
* When communicate with this device,
* - call esp_now_get_peer_channel to get its channel first,
* - then call wifi_set_channel to be in the same channel and do communication.
*
* @param uint8 *mac_addr : MAC address of target device.
* @param uint8 channel : channel, usually to be 1 ~ 13, some area may use channel 14.
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_set_peer_channel(uint8 *mac_addr, uint8 channel);
/**
* @brief Get channel information of a ESP-NOW device.
*
* @attention ESP-NOW communication needs to be at the same channel.
*
* @param uint8 *mac_addr : MAC address of target device.
*
* @return 1 ~ 13 (some area may get 14) : channel number
* @return Non-0 : fail
*/
sint32 esp_now_get_peer_channel(uint8 *mac_addr);
/**
* @brief Set ESP-NOW key for a target device.
*
* If it is set multiple times, new key will cover the old one.
*
* @param uint8 *mac_addr : MAC address of target device.
* @param uint8 *key : 16 bytes key which is needed for ESP-NOW communication,
* if it is NULL, current key will be reset to be none.
* @param uint8 key_len : key length, has to be 16 bytes now
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_set_peer_key(uint8 *mac_addr, uint8 *key, uint8 key_len);
/**
* @brief Get ESP-NOW key of a target device.
*
* If it is set multiple times, new key will cover the old one.
*
* @param uint8 *mac_addr : MAC address of target device.
* @param uint8 *key : pointer of key, buffer size has to be 16 bytes at least
* @param uint8 key_len : key length
*
* @return 0 : succeed
* @return > 0 : find target device but can't get key
* @return < 0 : fail
*/
sint32 esp_now_get_peer_key(uint8 *mac_addr, uint8 *key, uint8 *key_len);
/**
* @brief Get MAC address of ESP-NOW device.
*
* Get MAC address of ESP-NOW device which is pointed now, and move
* the pointer to next one in ESP-NOW MAC list or move the pointer to
* the first one in ESP-NOW MAC list.
*
* @attention 1. This API can not re-entry
* @attention 2. Parameter has to be true when you call it the first time.
*
* @param bool restart : true, move pointer to the first one in ESP-NOW MAC list;
* false, move pointer to the next one in ESP-NOW MAC list
*
* @return NULL, no ESP-NOW devices exist
* @return Otherwise, MAC address of ESP-NOW device which is pointed now
*/
uint8 *esp_now_fetch_peer(bool restart);
/**
* @brief Check if target device exists or not.
*
* @param uint8 *mac_addr : MAC address of target device.
*
* @return 0 : device does not exist
* @return < 0 : error occur, check fail
* @return > 0 : device exists
*/
sint32 esp_now_is_peer_exist(uint8 *mac_addr);
/**
* @brief Get the total number of ESP-NOW devices which are associated, and the
* number count of encrypted devices.
*
* @param uint8 *all_cnt : total number of ESP-NOW devices which are associated.
* @param uint8 *encryp_cnt : number count of encrypted devices
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_get_cnt_info(uint8 *all_cnt, uint8 *encrypt_cnt);
/**
* @brief Set the encrypt key of communication key.
*
* All ESP-NOW devices share the same encrypt key. If users do not set
* the encrypt key, ESP-NOW communication key will be encrypted by a default key.
*
* @param uint8 *key : pointer of encrypt key.
* @param uint8 len : key length, has to be 16 bytes now.
*
* @return 0 : succeed
* @return Non-0 : fail
*/
sint32 esp_now_set_kok(uint8 *key, uint8 len);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif
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