GET wifi status as connected or not connected

[microwrk234]

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1. [/#include <string.h>
2. #include "freertos/FreeRTOS.h"
3. #include "freertos/task.h"
4. #include "freertos/event_groups.h"
5. #include "esp_system.h"
6. #include "esp_wifi.h"
7. #include "esp_event_loop.h"
8. #include "esp_log.h"
9. #include "nvs_flash.h"
10.  
11. #include "lwip/err.h"
12. #include "lwip/sys.h"
13.  
14. #define EXAMPLE_ESP_WIFI_SSID      CONFIG_ESP_WIFI_SSID
15. #define EXAMPLE_ESP_WIFI_PASS      CONFIG_ESP_WIFI_PASSWORD
16. #define EXAMPLE_ESP_MAXIMUM_RETRY  CONFIG_ESP_MAXIMUM_RETRY
17.  
18. static EventGroupHandle_t s_wifi_event_group;
19. const int WIFI_CONNECTED_BIT = BIT0;
20. static const char *TAG = "wifi station";
21. static int s_retry_num = 0;
22.  
23.  
24. static void check_status()
25. {
26.     EventBits_t uxBits;
27.     uxBits = xEventGroupGetBits(s_wifi_event_group);
28.     if(uxBits & WIFI_CONNECTED_BIT)
29.     {
30.         printf ("wifi connected\n");
31.     }
32.    
33.     else if (!(uxBits & WIFI_CONNECTED_BIT))
34.     {
35.         printf ("wifi disconnected\n");
36.     }
37.    
38. }
39.  
40. static esp_err_t event_handler(void *ctx, system_event_t *event)
41. {
42.     switch(event->event_id)
43.     {
44.     case SYSTEM_EVENT_STA_START:
45.         esp_wifi_connect();
46.         break;
47.     case SYSTEM_EVENT_STA_GOT_IP:
48.         ESP_LOGI(TAG, "got ip:%s",
49.                  ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
50.         s_retry_num = 0;
51.         xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
52.        
53.         check_status(); // To update the wifi status
54.         break;
55.        
56.     case SYSTEM_EVENT_STA_DISCONNECTED:
57.     {
58.         esp_wifi_connect();
59.         xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
60.        
61.         check_status(); // To update the wifi status
62.         break;       
63.     }
64.     default:
65.         break;
66.     }
67.     return ESP_OK;
68. }
69.  
70. void wifi_init_sta()
71. {
72.     s_wifi_event_group = xEventGroupCreate();
73.  
74.     tcpip_adapter_init();
75.     ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
76.  
77.     wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
78.     ESP_ERROR_CHECK(esp_wifi_init(&cfg));
79.     wifi_config_t wifi_config = {
80.         .sta = {
81.             .ssid = EXAMPLE_ESP_WIFI_SSID,
82.             .password = EXAMPLE_ESP_WIFI_PASS
83.         },
84.     };
85.  
86.     ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
87.     ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
88.     ESP_ERROR_CHECK(esp_wifi_start() );
89.  
90.     ESP_LOGI(TAG, "wifi_init_sta finished.");
91.     ESP_LOGI(TAG, "connect to ap SSID:%s password:%s",
92.              EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
93. }
94.  
95. void app_main()
96. {
97.     //Initialize NVS
98.     esp_err_t ret = nvs_flash_init();
99.     if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
100.       ESP_ERROR_CHECK(nvs_flash_erase());
101.       ret = nvs_flash_init();
102.     }
103.     ESP_ERROR_CHECK(ret);
104.    
105.     ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
106.     wifi_init_sta();
107. }]

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