ESP32 Forum

Posted: **Sat Aug 14, 2021 12:19 pm**

Hello

What i want:

Connect to wifi
esp_wifi_stop()
Reconnect to wifi
esp_wifi_stop()

For now I only connect to wifi once

Code: Select all

esp_err_t ret = nvs_flash_init();
    if(ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND){
      	ESP_ERROR_CHECK(nvs_flash_erase());
    	ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);
    s_wifi_event_group = xEventGroupCreate();
    ESP_ERROR_CHECK(esp_netif_init());
    ESP_ERROR_CHECK(esp_event_loop_create_default());
    esp_netif_create_default_wifi_sta();
    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));

    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
   wifi_config_t wifi_config = {
    	           	 .sta = {
    	           	 .ssid = EXAMPLE_ESP_WIFI_SSID,
    	           	 .password = EXAMPLE_ESP_WIFI_PASS,
    	           	 .threshold.authmode = WIFI_AUTH_WPA2_PSK,
    	           	    .pmf_cfg = {
    	           	       .capable = true,
    	                   .required = false
    	               	},
    	             },
   };
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );

    ESP_ERROR_CHECK(esp_wifi_start() );

    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);

    if (bits & WIFI_CONNECTED_BIT) {
        //sntp sync
                }
    ESP_ERROR_CHECK(esp_wifi_stop() );

    vTaskDelay(3000/portTICK_PERIOD_MS);


    ESP_ERROR_CHECK(esp_wifi_start() );
    if (bits & WIFI_CONNECTED_BIT) {
             ESP_LOGI(TAG, "connected to ap SSID:%s password:%s", EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
        } else if (bits & WIFI_FAIL_BIT) {
             ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s", EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
        } else {
             ESP_LOGE(TAG, "UNEXPECTED EVENT");
        }
    if(bits & WIFI_CONNECTED_BIT){
    	//sntp sync			
                    }
 
    ESP_ERROR_CHECK(esp_wifi_stop() );

What I am doing wrong?

Posted: **Sat Aug 14, 2021 4:19 pm**

solution:

Code: Select all

esp_err_t ret = nvs_flash_init();
    if(ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND){
      	ESP_ERROR_CHECK(nvs_flash_erase());
    	ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);
    s_wifi_event_group = xEventGroupCreate();
    ESP_ERROR_CHECK(esp_netif_init());
    ESP_ERROR_CHECK(esp_event_loop_create_default());
    esp_netif_create_default_wifi_sta();
    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));

    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
   wifi_config_t wifi_config = {
    	           	 .sta = {
    	           	 .ssid = EXAMPLE_ESP_WIFI_SSID,
    	           	 .password = EXAMPLE_ESP_WIFI_PASS,
    	           	 .threshold.authmode = WIFI_AUTH_WPA2_PSK,
    	           	    .pmf_cfg = {
    	           	       .capable = true,
    	                   .required = false
    	               	},
    	             },
   };
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );

    ESP_ERROR_CHECK(esp_wifi_start() );

    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);

    if (bits & WIFI_CONNECTED_BIT) {
        //sntp sync
                }
    ESP_ERROR_CHECK(esp_wifi_stop() );

    vTaskDelay(3000/portTICK_PERIOD_MS);

    s_wifi_event_group = xEventGroupCreate();
    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
    ESP_ERROR_CHECK(esp_wifi_start() );
    bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
    if (bits & WIFI_CONNECTED_BIT) {
             ESP_LOGI(TAG, "connected to ap SSID:%s password:%s", EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
        } else if (bits & WIFI_FAIL_BIT) {
             ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s", EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
        } else {
             ESP_LOGE(TAG, "UNEXPECTED EVENT");
        }
    ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
    ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
    vEventGroupDelete(s_wifi_event_group);    
    if(bits & WIFI_CONNECTED_BIT){
    	//sntp sync			
                    }
 
    ESP_ERROR_CHECK(esp_wifi_stop() );

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