135 lines
4.7 KiB
C
135 lines
4.7 KiB
C
#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "esp_event.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "nvs.h"
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#include "lwip/err.h"
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#include "lwip/sys.h"
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#define WIFI_SSID_MAX_LEN 32
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#define WIFI_PASS_MAX_LEN 64
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#define MAX_RETRY 5
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static EventGroupHandle_t s_wifi_event_group;
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#define WIFI_CONNECTED_BIT BIT0
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#define WIFI_FAIL_BIT BIT1
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static const char *TAG = "wifi_nvm_sta";
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static int s_retry_num = 0;
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void save_wifi_creds(const char *ssid, const char *pass) {
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nvs_handle_t nvs_handle;
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ESP_ERROR_CHECK(nvs_open("wifi_creds", NVS_READWRITE, &nvs_handle));
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ESP_ERROR_CHECK(nvs_set_str(nvs_handle, "ssid", ssid));
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ESP_ERROR_CHECK(nvs_set_str(nvs_handle, "pass", pass));
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ESP_ERROR_CHECK(nvs_commit(nvs_handle));
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nvs_close(nvs_handle);
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ESP_LOGI(TAG, "WiFi credentials saved");
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}
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bool load_wifi_creds(char *ssid, size_t ssid_len, char *pass, size_t pass_len) {
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nvs_handle_t nvs_handle;
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esp_err_t err = nvs_open("wifi_creds", NVS_READONLY, &nvs_handle);
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if (err != ESP_OK) return false;
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err = nvs_get_str(nvs_handle, "ssid", ssid, &ssid_len);
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if (err != ESP_OK) {
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nvs_close(nvs_handle);
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return false;
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}
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err = nvs_get_str(nvs_handle, "pass", pass, &pass_len);
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nvs_close(nvs_handle);
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return err == ESP_OK;
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}
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static void event_handler(void* arg, esp_event_base_t event_base,
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int32_t event_id, void* event_data) {
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if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
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esp_wifi_connect();
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} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
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if (s_retry_num < MAX_RETRY) {
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esp_wifi_connect();
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s_retry_num++;
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ESP_LOGI(TAG, "retrying connection to AP");
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} else {
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xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
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}
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ESP_LOGI(TAG,"failed to connect to AP");
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} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
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ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
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ESP_LOGI(TAG, "got ip: " IPSTR, IP2STR(&event->ip_info.ip));
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s_retry_num = 0;
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xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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}
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}
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void wifi_init_sta(void) {
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char ssid[WIFI_SSID_MAX_LEN] = {0};
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char pass[WIFI_PASS_MAX_LEN] = {0};
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bool creds_loaded = load_wifi_creds(ssid, sizeof(ssid), pass, sizeof(pass));
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if (!creds_loaded) {
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// Default open network: UCLA_WIFI
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strcpy(ssid, "UCLA_WIFI");
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pass[0] = '\0'; // No password
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save_wifi_creds(ssid, pass);
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}
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s_wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK(esp_netif_init());
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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esp_netif_create_default_wifi_sta();
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK(esp_wifi_init(&cfg));
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esp_event_handler_instance_t instance_any_id;
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esp_event_handler_instance_t instance_got_ip;
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ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
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ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
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wifi_config_t wifi_config = { 0 };
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strncpy((char *)wifi_config.sta.ssid, ssid, sizeof(wifi_config.sta.ssid));
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strncpy((char *)wifi_config.sta.password, pass, sizeof(wifi_config.sta.password));
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wifi_config.sta.threshold.authmode = WIFI_AUTH_OPEN;
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
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ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
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ESP_ERROR_CHECK(esp_wifi_start());
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ESP_LOGI(TAG, "wifi_init_sta finished.");
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EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
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WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
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pdFALSE,
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pdFALSE,
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portMAX_DELAY);
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if (bits & WIFI_CONNECTED_BIT) {
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ESP_LOGI(TAG, "connected to SSID:%s", ssid);
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} else if (bits & WIFI_FAIL_BIT) {
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ESP_LOGI(TAG, "Failed to connect to SSID:%s", ssid);
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} else {
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ESP_LOGE(TAG, "UNEXPECTED EVENT");
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}
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}
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void app_main(void) {
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK(ret);
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ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
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wifi_init_sta();
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}
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