HTTP server in SoftAp mode with IP configuration [ESP-IDF]

[karlo.verde.13]

Hey there!

This is an example of HTTP server in AP mode.

NOTES

• Some header files are unnecessary.
• This example also includes IP configuration.
• The URI handler has minimal code in this example but you can define it as you wish.
• If you have an Android device, I recommend that you use this app: https://play.google.com/store/apps/deta ... tprequests.

Code: [Select all] [Expand/Collapse]

1. #include "string.h"
2.  
3. #include "freertos/FreeRTOS.h"
4. #include "freertos/task.h"
5. #include "freertos/event_groups.h"
6. #include "esp_wifi.h"
7. #include "esp_system.h"
8. #include "esp_event.h"
9. #include "esp_event_loop.h"
10. #include "esp_log.h"
11. #include "nvs_flash.h"
12. #include "esp_http_server.h"
13.  
14. #define SOFT_AP_SSID "ESP32 SoftAP"
15. #define SOFT_AP_PASSWORD "Password"
16.  
17. #define SOFT_AP_IP_ADDRESS_1 192
18. #define SOFT_AP_IP_ADDRESS_2 168
19. #define SOFT_AP_IP_ADDRESS_3 5
20. #define SOFT_AP_IP_ADDRESS_4 18
21.  
22. #define SOFT_AP_GW_ADDRESS_1 192
23. #define SOFT_AP_GW_ADDRESS_2 168
24. #define SOFT_AP_GW_ADDRESS_3 5
25. #define SOFT_AP_GW_ADDRESS_4 20
26.  
27. #define SOFT_AP_NM_ADDRESS_1 255
28. #define SOFT_AP_NM_ADDRESS_2 255
29. #define SOFT_AP_NM_ADDRESS_3 255
30. #define SOFT_AP_NM_ADDRESS_4 0
31.  
32. #define SERVER_PORT 3500
33. #define HTTP_METHOD HTTP_POST
34. #define URI_STRING "/test"
35.  
36. static httpd_handle_t httpServerInstance = NULL;
37.  
38. static esp_err_t methodHandler(httpd_req_t* httpRequest){
39.     ESP_LOGI("HANDLER","This is the handler for the <%s> URI", httpRequest->uri);
40.     return ESP_OK;
41. }
42.  
43. static httpd_uri_t testUri = {
44.     .uri       = URI_STRING,
45.     .method    = HTTP_METHOD,
46.     .handler   = methodHandler,
47.     .user_ctx  = NULL,
48. };
49.  
50. static void startHttpServer(void){
51.     httpd_config_t httpServerConfiguration = HTTPD_DEFAULT_CONFIG();
52.     httpServerConfiguration.server_port = SERVER_PORT;
53.     if(httpd_start(&httpServerInstance, &httpServerConfiguration) == ESP_OK){
54.         ESP_ERROR_CHECK(httpd_register_uri_handler(httpServerInstance, &testUri));
55.     }
56. }
57.  
58. static void stopHttpServer(void){
59.     if(httpServerInstance != NULL){
60.         ESP_ERROR_CHECK(httpd_stop(httpServerInstance));
61.     }
62. }
63.  
64. static esp_err_t wifiEventHandler(void* userParameter, system_event_t *event) {
65.     switch(event->event_id){
66.     case SYSTEM_EVENT_AP_STACONNECTED:
67.         startHttpServer();
68.         break;
69.     case SYSTEM_EVENT_AP_STADISCONNECTED:
70.         stopHttpServer();
71.         break;
72.     default:
73.         break;
74.     }
75.     return ESP_OK;
76. }
77.  
78. static void launchSoftAp(){
79.     ESP_ERROR_CHECK(nvs_flash_init());
80.     tcpip_adapter_init();
81.     ESP_ERROR_CHECK(tcpip_adapter_dhcps_stop(TCPIP_ADAPTER_IF_AP));
82.     tcpip_adapter_ip_info_t ipAddressInfo;
83.     memset(&ipAddressInfo, 0, sizeof(ipAddressInfo));
84.     IP4_ADDR(
85.         &ipAddressInfo.ip,
86.         SOFT_AP_IP_ADDRESS_1,
87.         SOFT_AP_IP_ADDRESS_2,
88.         SOFT_AP_IP_ADDRESS_3,
89.         SOFT_AP_IP_ADDRESS_4);
90.     IP4_ADDR(
91.         &ipAddressInfo.gw,
92.         SOFT_AP_GW_ADDRESS_1,
93.         SOFT_AP_GW_ADDRESS_2,
94.         SOFT_AP_GW_ADDRESS_3,
95.         SOFT_AP_GW_ADDRESS_4);
96.     IP4_ADDR(
97.         &ipAddressInfo.netmask,
98.         SOFT_AP_NM_ADDRESS_1,
99.         SOFT_AP_NM_ADDRESS_2,
100.         SOFT_AP_NM_ADDRESS_3,
101.         SOFT_AP_NM_ADDRESS_4);
102.     ESP_ERROR_CHECK(tcpip_adapter_set_ip_info(TCPIP_ADAPTER_IF_AP, &ipAddressInfo));
103.     ESP_ERROR_CHECK(tcpip_adapter_dhcps_start(TCPIP_ADAPTER_IF_AP));
104.     ESP_ERROR_CHECK(esp_event_loop_init(wifiEventHandler, NULL));
105.     wifi_init_config_t wifiConfiguration = WIFI_INIT_CONFIG_DEFAULT();
106.     ESP_ERROR_CHECK(esp_wifi_init(&wifiConfiguration));
107.     ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
108.     wifi_config_t apConfiguration = {
109.         .ap = {
110.             .ssid = SOFT_AP_SSID,
111.             .password = SOFT_AP_PASSWORD,
112.             .ssid_len = 0,
113.             //.channel = default,
114.             .authmode = WIFI_AUTH_WPA2_PSK,
115.             .ssid_hidden = 0,
116.             .max_connection = 1,
117.             .beacon_interval = 150,
118.         },
119.     };
120.     ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &apConfiguration));
121.     ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
122.     ESP_ERROR_CHECK(esp_wifi_start());
123. }
124.  
125. void app_main(void){
126.     launchSoftAp();
127.     while(1) vTaskDelay(10);
128. }

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Hope it helps
Best regards
Verde