ESP32-C6 RISC-V에서 Wi-Fi 연결 및 데이터 전송

#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_http_client.h"
#include "nvs_flash.h"

#define WIFI_SSID "your_ssid"
#define WIFI_PASS "your_password"
#define SERVER_URL "http://example.com/api/data"

static void wifi_event_handler(void* arg, esp_event_base_t event_base,
                              int32_t event_id, void* event_data) {
    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
        esp_wifi_connect();
    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
        esp_wifi_connect();
    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
        ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
        printf("Connected with IP Address: " IPSTR "\n", IP2STR(&event->ip_info.ip));
    }
}

static void http_post_task(void *pvParameters) {
    while (1) {
        // 센서에서 데이터 읽기 (예: 온도)
        float temperature = read_temperature();
        
        // HTTP 요청 설정
        esp_http_client_config_t config = {
            .url = SERVER_URL,
            .method = HTTP_METHOD_POST,
        };
        esp_http_client_handle_t client = esp_http_client_init(&config);
        
        // JSON 데이터 생성
        char post_data[100];
        sprintf(post_data, "{\"temperature\": %.2f}", temperature);
        
        esp_http_client_set_header(client, "Content-Type", "application/json");
        esp_http_client_set_post_field(client, post_data, strlen(post_data));
        
        // 요청 보내기
        esp_err_t err = esp_http_client_perform(client);
        if (err == ESP_OK) {
            printf("Data sent successfully, status: %d\n", 
                   esp_http_client_get_status_code(client));
        }
        
        esp_http_client_cleanup(client);
        vTaskDelay(60000 / portTICK_PERIOD_MS); // 1분마다 전송
    }
}

void app_main() {
    // NVS 초기화
    nvs_flash_init();
    
    // Wi-Fi 초기화
    esp_netif_init();
    esp_event_loop_create_default();
    esp_netif_create_default_wifi_sta();
    
    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    esp_wifi_init(&cfg);
    
    // 이벤트 핸들러 등록
    esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL);
    esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &wifi_event_handler, NULL);
    
    // Wi-Fi 설정
    wifi_config_t wifi_config = {
        .sta = {
            .ssid = WIFI_SSID,
            .password = WIFI_PASS,
        },
    };
    esp_wifi_set_mode(WIFI_MODE_STA);
    esp_wifi_set_config(WIFI_IF_STA, &wifi_config);
    esp_wifi_start();
    
    // HTTP 태스크 시작
    xTaskCreate(&http_post_task, "http_post_task", 4096, NULL, 5, NULL);
}