#include "zh_espnow.h"
#define DATA_SEND_SUCCESS BIT0
#define DATA_SEND_FAIL BIT1
#define MAC2STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]
static void _send_cb(const uint8_t *mac_addr, esp_now_send_status_t status);
#if defined CONFIG_IDF_TARGET_ESP8266 || ESP_IDF_VERSION_MAJOR == 4
static void _recv_cb(const uint8_t *mac_addr, const uint8_t *data, int data_len);
#else
static void _recv_cb(const esp_now_recv_info_t *esp_now_info, const uint8_t *data, int data_len);
#endif
static void _processing(void *pvParameter);
static const char *TAG = "zh_espnow";
static EventGroupHandle_t _event_group_handle = {0};
static QueueHandle_t _queue_handle = {0};
static TaskHandle_t _processing_task_handle = {0};
static zh_espnow_init_config_t _init_config = {0};
static bool _is_initialized = false;
static uint8_t _attempts = 0;
#if defined ESP_NOW_MAX_DATA_LEN_V2
static uint16_t _max_message_size = ESP_NOW_MAX_DATA_LEN_V2;
#else
static uint16_t _max_message_size = ESP_NOW_MAX_DATA_LEN;
#endif
typedef struct
{
enum
{
ON_RECV,
TO_SEND,
} id;
struct
{
uint8_t mac_addr[ESP_NOW_ETH_ALEN];
uint8_t *payload;
uint16_t payload_len;
} data;
} _queue_t;
ESP_EVENT_DEFINE_BASE(ZH_ESPNOW);
esp_err_t zh_espnow_init(const zh_espnow_init_config_t *config)
{
ESP_LOGI(TAG, "ESP-NOW initialization begin.");
if (config == NULL)
{
ESP_LOGE(TAG, "ESP-NOW initialization fail. Invalid argument.");
return ESP_ERR_INVALID_ARG;
}
_init_config = *config;
if (_init_config.wifi_channel < 1 || _init_config.wifi_channel > 14)
{
ESP_LOGE(TAG, "ESP-NOW initialization fail. WiFi channel incorrect.");
return ESP_ERR_INVALID_ARG;
}
esp_err_t err = esp_wifi_set_channel(_init_config.wifi_channel, WIFI_SECOND_CHAN_NONE);
if (err == ESP_ERR_WIFI_NOT_INIT || err == ESP_ERR_WIFI_NOT_STARTED)
{
ESP_LOGE(TAG, "ESP-NOW initialization fail. WiFi not initialized.");
return ESP_ERR_WIFI_NOT_INIT;
}
else if (err == ESP_FAIL)
{
uint8_t prim = 0;
wifi_second_chan_t sec = WIFI_SECOND_CHAN_NONE;
esp_wifi_get_channel(&prim, &sec);
if (prim != _init_config.wifi_channel)
{
ESP_LOGW(TAG, "ESP-NOW initialization warning. The device is connected to the router. Channel %d will be used for ESP-NOW.", prim);
}
}
esp_wifi_set_protocol(_init_config.wifi_interface, WIFI_PROTOCOL_11B | WIFI_PROTOCOL_LR);
_event_group_handle = xEventGroupCreate();
_queue_handle = xQueueCreate(_init_config.queue_size, sizeof(_queue_t));
if (esp_now_init() != ESP_OK || esp_now_register_send_cb(_send_cb) != ESP_OK || esp_now_register_recv_cb(_recv_cb) != ESP_OK)
{
ESP_LOGE(TAG, "ESP-NOW initialization fail. Internal error at line %d.", __LINE__);
return ESP_FAIL;
}
if (xTaskCreatePinnedToCore(&_processing, "NULL", _init_config.stack_size, NULL, _init_config.task_priority, &_processing_task_handle, tskNO_AFFINITY) != pdPASS)
{
ESP_LOGE(TAG, "ESP-NOW initialization fail. Internal error at line %d.", __LINE__);
return ESP_FAIL;
}
_is_initialized = true;
ESP_LOGI(TAG, "ESP-NOW initialization success.");
return ESP_OK;
}
esp_err_t zh_espnow_deinit(void)
{
ESP_LOGI(TAG, "ESP-NOW deinitialization begin.");
if (_is_initialized == false)
{
ESP_LOGE(TAG, "ESP-NOW deinitialization fail. ESP-NOW not initialized.");
return ESP_FAIL;
}
vEventGroupDelete(_event_group_handle);
vQueueDelete(_queue_handle);
esp_now_unregister_send_cb();
esp_now_unregister_recv_cb();
esp_now_deinit();
vTaskDelete(_processing_task_handle);
_is_initialized = false;
ESP_LOGI(TAG, "ESP-NOW deinitialization success.");
return ESP_OK;
}
esp_err_t zh_espnow_send(const uint8_t *target, const uint8_t *data, const uint8_t data_len)
{
if (target == NULL)
{
ESP_LOGI(TAG, "Adding outgoing ESP-NOW data to MAC FF:FF:FF:FF:FF:FF to queue begin.");
}
else
{
ESP_LOGI(TAG, "Adding outgoing ESP-NOW data to MAC %02X:%02X:%02X:%02X:%02X:%02X to queue begin.", MAC2STR(target));
}
if (_is_initialized == false)
{
ESP_LOGE(TAG, "Adding outgoing ESP-NOW data to queue fail. ESP-NOW not initialized.");
return ESP_FAIL;
}
if (data == NULL || data_len == 0 || data_len > _max_message_size)
{
ESP_LOGE(TAG, "Adding outgoing ESP-NOW data to queue fail. Invalid argument.");
return ESP_ERR_INVALID_ARG;
}
if (uxQueueSpacesAvailable(_queue_handle) < _init_config.queue_size / 10)
{
ESP_LOGW(TAG, "Adding outgoing ESP-NOW data to queue fail. Queue is almost full.");
return ESP_ERR_INVALID_STATE;
}
uint8_t broadcast[ESP_NOW_ETH_ALEN] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
_queue_t queue = {0};
queue.id = TO_SEND;
if (target == NULL)
{
memcpy(queue.data.mac_addr, broadcast, ESP_NOW_ETH_ALEN);
}
else
{
memcpy(queue.data.mac_addr, target, ESP_NOW_ETH_ALEN);
}
queue.data.payload = heap_caps_calloc(1, data_len, MALLOC_CAP_8BIT);
if (queue.data.payload == NULL)
{
ESP_LOGE(TAG, "Adding outgoing ESP-NOW data to queue fail. Memory allocation fail or no free memory in the heap.");
return ESP_ERR_NO_MEM;
}
memcpy(queue.data.payload, data, data_len);
queue.data.payload_len = data_len;
if (target == NULL)
{
ESP_LOGI(TAG, "Adding outgoing ESP-NOW data to MAC FF:FF:FF:FF:FF:FF to queue success.");
}
else
{
ESP_LOGI(TAG, "Adding outgoing ESP-NOW data to MAC %02X:%02X:%02X:%02X:%02X:%02X to queue success.", MAC2STR(target));
}
if (xQueueSend(_queue_handle, &queue, portTICK_PERIOD_MS) != pdTRUE)
{
ESP_LOGE(TAG, "ESP-NOW message processing task internal error at line %d.", __LINE__);
return ESP_FAIL;
}
return ESP_OK;
}
static void IRAM_ATTR _send_cb(const uint8_t *mac_addr, esp_now_send_status_t status)
{
if (status == ESP_NOW_SEND_SUCCESS)
{
xEventGroupSetBits(_event_group_handle, DATA_SEND_SUCCESS);
}
else
{
xEventGroupSetBits(_event_group_handle, DATA_SEND_FAIL);
}
}
#if defined CONFIG_IDF_TARGET_ESP8266 || ESP_IDF_VERSION_MAJOR == 4
static void IRAM_ATTR _recv_cb(const uint8_t *mac_addr, const uint8_t *data, int data_len)
#else
static void IRAM_ATTR _recv_cb(const esp_now_recv_info_t *esp_now_info, const uint8_t *data, int data_len)
#endif
{
#if defined CONFIG_IDF_TARGET_ESP8266 || ESP_IDF_VERSION_MAJOR == 4
ESP_LOGI(TAG, "Adding incoming ESP-NOW data from MAC %02X:%02X:%02X:%02X:%02X:%02X to queue begin.", MAC2STR(mac_addr));
#else
ESP_LOGI(TAG, "Adding incoming ESP-NOW data from MAC %02X:%02X:%02X:%02X:%02X:%02X to queue begin.", MAC2STR(esp_now_info->src_addr));
#endif
if (uxQueueSpacesAvailable(_queue_handle) < _init_config.queue_size / 10)
{
ESP_LOGW(TAG, "Adding incoming ESP-NOW data to queue fail. Queue is almost full.");
return;
}
_queue_t queue = {0};
queue.id = ON_RECV;
#if defined CONFIG_IDF_TARGET_ESP8266 || ESP_IDF_VERSION_MAJOR == 4
memcpy(queue.data.mac_addr, mac_addr, ESP_NOW_ETH_ALEN);
#else
memcpy(queue.data.mac_addr, esp_now_info->src_addr, ESP_NOW_ETH_ALEN);
#endif
queue.data.payload = heap_caps_calloc(1, data_len, MALLOC_CAP_8BIT);
if (queue.data.payload == NULL)
{
ESP_LOGE(TAG, "Adding incoming ESP-NOW data to queue fail. Memory allocation fail or no free memory in the heap.");
return;
}
memcpy(queue.data.payload, data, data_len);
queue.data.payload_len = data_len;
#if defined CONFIG_IDF_TARGET_ESP8266 || ESP_IDF_VERSION_MAJOR == 4
ESP_LOGI(TAG, "Adding incoming ESP-NOW data from MAC %02X:%02X:%02X:%02X:%02X:%02X to queue success.", MAC2STR(mac_addr));
#else
ESP_LOGI(TAG, "Adding incoming ESP-NOW data from MAC %02X:%02X:%02X:%02X:%02X:%02X to queue success.", MAC2STR(esp_now_info->src_addr));
#endif
if (xQueueSend(_queue_handle, &queue, portTICK_PERIOD_MS) != pdTRUE)
{
ESP_LOGE(TAG, "ESP-NOW message processing task internal error at line %d.", __LINE__);
}
}
static void IRAM_ATTR _processing(void *pvParameter)
{
_queue_t queue = {0};
while (xQueueReceive(_queue_handle, &queue, portMAX_DELAY) == pdTRUE)
{
esp_err_t err = ESP_OK;
switch (queue.id)
{
case TO_SEND:
ESP_LOGI(TAG, "Outgoing ESP-NOW data to MAC %02X:%02X:%02X:%02X:%02X:%02X processing begin.", MAC2STR(queue.data.mac_addr));
esp_now_peer_info_t *peer = heap_caps_calloc(1, sizeof(esp_now_peer_info_t), MALLOC_CAP_8BIT);
if (peer == NULL)
{
ESP_LOGE(TAG, "Outgoing ESP-NOW data processing fail. Memory allocation fail or no free memory in the heap.");
heap_caps_free(queue.data.payload);
break;
}
peer->ifidx = _init_config.wifi_interface;
memcpy(peer->peer_addr, queue.data.mac_addr, ESP_NOW_ETH_ALEN);
err = esp_now_add_peer(peer);
if (err == ESP_ERR_ESPNOW_NO_MEM)
{
ESP_LOGE(TAG, "Outgoing ESP-NOW data processing fail. No free memory in the heap for adding peer.");
heap_caps_free(queue.data.payload);
heap_caps_free(peer);
break;
}
else if (err != ESP_OK)
{
ESP_LOGE(TAG, "Outgoing ESP-NOW data processing fail. Internal error with adding peer.");
heap_caps_free(queue.data.payload);
heap_caps_free(peer);
break;
}
zh_espnow_event_on_send_t *on_send = heap_caps_calloc(1, sizeof(zh_espnow_event_on_send_t), MALLOC_CAP_8BIT);
if (on_send == NULL)
{
ESP_LOGE(TAG, "Outgoing ESP-NOW data processing fail. Memory allocation fail or no free memory in the heap.");
heap_caps_free(queue.data.payload);
heap_caps_free(peer);
break;
}
memcpy(on_send->mac_addr, queue.data.mac_addr, ESP_NOW_ETH_ALEN);
SEND:
++_attempts;
err = esp_now_send(queue.data.mac_addr, queue.data.payload, queue.data.payload_len);
if (err == ESP_ERR_ESPNOW_NO_MEM)
{
ESP_LOGE(TAG, "Sending ESP-NOW data fail. No free memory in the heap.");
heap_caps_free(queue.data.payload);
heap_caps_free(peer);
heap_caps_free(on_send);
ESP_LOGE(TAG, "Outgoing ESP-NOW data processing fail.");
break;
}
else if (err != ESP_OK)
{
ESP_LOGE(TAG, "Sending ESP-NOW data fail. Internal error at line %d.", __LINE__);
heap_caps_free(queue.data.payload);
heap_caps_free(peer);
heap_caps_free(on_send);
ESP_LOGE(TAG, "Outgoing ESP-NOW data processing fail.");
break;
}
else
{
ESP_LOGI(TAG, "Sending ESP-NOW data to MAC %02X:%02X:%02X:%02X:%02X:%02X success.", MAC2STR(queue.data.mac_addr));
}
EventBits_t bit = xEventGroupWaitBits(_event_group_handle, DATA_SEND_SUCCESS | DATA_SEND_FAIL, pdTRUE, pdFALSE, 50 / portTICK_PERIOD_MS);
if ((bit & DATA_SEND_SUCCESS) != 0)
{
ESP_LOGI(TAG, "Confirmation message received. ESP-NOW message to MAC %02X:%02X:%02X:%02X:%02X:%02X sent success after %d attempts.", MAC2STR(queue.data.mac_addr), _attempts);
on_send->status = ZH_ESPNOW_SEND_SUCCESS;
_attempts = 0;
}
else
{
if (_attempts < _init_config.attempts)
{
goto SEND;
}
ESP_LOGE(TAG, "Confirmation message not received. ESP-NOW message to MAC %02X:%02X:%02X:%02X:%02X:%02X sent fail.", MAC2STR(queue.data.mac_addr));
on_send->status = ZH_ESPNOW_SEND_FAIL;
_attempts = 0;
}
ESP_LOGI(TAG, "Outgoing ESP-NOW data to MAC %02X:%02X:%02X:%02X:%02X:%02X processed success.", MAC2STR(queue.data.mac_addr));
if (esp_event_post(ZH_ESPNOW, ZH_ESPNOW_ON_SEND_EVENT, on_send, sizeof(zh_espnow_event_on_send_t), portTICK_PERIOD_MS) != ESP_OK)
{
ESP_LOGE(TAG, "ESP-NOW message processing task internal error at line %d.", __LINE__);
}
heap_caps_free(queue.data.payload);
esp_now_del_peer(peer->peer_addr);
heap_caps_free(peer);
heap_caps_free(on_send);
break;
case ON_RECV:
ESP_LOGI(TAG, "Incoming ESP-NOW data from MAC %02X:%02X:%02X:%02X:%02X:%02X processing begin.", MAC2STR(queue.data.mac_addr));
zh_espnow_event_on_recv_t *recv_data = (zh_espnow_event_on_recv_t *)&queue.data;
ESP_LOGI(TAG, "Incoming ESP-NOW data from MAC %02X:%02X:%02X:%02X:%02X:%02X processed success.", MAC2STR(queue.data.mac_addr));
if (esp_event_post(ZH_ESPNOW, ZH_ESPNOW_ON_RECV_EVENT, recv_data, recv_data->data_len + sizeof(recv_data->mac_addr) + sizeof(uint8_t), portTICK_PERIOD_MS) != ESP_OK)
{
ESP_LOGE(TAG, "ESP-NOW message processing task internal error at line %d.", __LINE__);
}
break;
default:
break;
}
}
vTaskDelete(NULL);
}