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: Untitled.c Select all

#include "string.h"



#include "freertos/FreeRTOS.h"

#include "freertos/task.h"

#include "freertos/event_groups.h"

#include "esp_wifi.h"

#include "esp_system.h"

#include "esp_event.h"

#include "esp_event_loop.h"

#include "esp_log.h"

#include "nvs_flash.h"

#include "esp_http_server.h"



#define SOFT_AP_SSID "ESP32 SoftAP"

#define SOFT_AP_PASSWORD "Password"



#define SOFT_AP_IP_ADDRESS_1 192

#define SOFT_AP_IP_ADDRESS_2 168

#define SOFT_AP_IP_ADDRESS_3 5

#define SOFT_AP_IP_ADDRESS_4 18



#define SOFT_AP_GW_ADDRESS_1 192

#define SOFT_AP_GW_ADDRESS_2 168

#define SOFT_AP_GW_ADDRESS_3 5

#define SOFT_AP_GW_ADDRESS_4 20



#define SOFT_AP_NM_ADDRESS_1 255

#define SOFT_AP_NM_ADDRESS_2 255

#define SOFT_AP_NM_ADDRESS_3 255

#define SOFT_AP_NM_ADDRESS_4 0



#define SERVER_PORT 3500

#define HTTP_METHOD HTTP_POST

#define URI_STRING "/test"



static httpd_handle_t httpServerInstance = NULL;



static esp_err_t methodHandler(httpd_req_t* httpRequest){

	ESP_LOGI("HANDLER","This is the handler for the <%s> URI", httpRequest->uri);

	return ESP_OK;

}



static httpd_uri_t testUri = {

    .uri       = URI_STRING,

    .method    = HTTP_METHOD,

    .handler   = methodHandler,

    .user_ctx  = NULL,

};



static void startHttpServer(void){

    httpd_config_t httpServerConfiguration = HTTPD_DEFAULT_CONFIG();

    httpServerConfiguration.server_port = SERVER_PORT;

    if(httpd_start(&httpServerInstance, &httpServerConfiguration) == ESP_OK){

        ESP_ERROR_CHECK(httpd_register_uri_handler(httpServerInstance, &testUri));

    }

}



static void stopHttpServer(void){

    if(httpServerInstance != NULL){

    	ESP_ERROR_CHECK(httpd_stop(httpServerInstance));

    }

}



static esp_err_t wifiEventHandler(void* userParameter, system_event_t *event) {

    switch(event->event_id){

	case SYSTEM_EVENT_AP_STACONNECTED:

		startHttpServer();

		break;

	case SYSTEM_EVENT_AP_STADISCONNECTED:

		stopHttpServer();

		break;

	default:

        break;

    }

	return ESP_OK;

}



static void launchSoftAp(){

	ESP_ERROR_CHECK(nvs_flash_init());

	tcpip_adapter_init();

	ESP_ERROR_CHECK(tcpip_adapter_dhcps_stop(TCPIP_ADAPTER_IF_AP));

	tcpip_adapter_ip_info_t ipAddressInfo;

    memset(&ipAddressInfo, 0, sizeof(ipAddressInfo));

	IP4_ADDR(

		&ipAddressInfo.ip,

		SOFT_AP_IP_ADDRESS_1,

		SOFT_AP_IP_ADDRESS_2,

		SOFT_AP_IP_ADDRESS_3,

		SOFT_AP_IP_ADDRESS_4);

    IP4_ADDR(

		&ipAddressInfo.gw,

		SOFT_AP_GW_ADDRESS_1,

		SOFT_AP_GW_ADDRESS_2,

		SOFT_AP_GW_ADDRESS_3,

		SOFT_AP_GW_ADDRESS_4);

    IP4_ADDR(

		&ipAddressInfo.netmask,

		SOFT_AP_NM_ADDRESS_1,

		SOFT_AP_NM_ADDRESS_2,

		SOFT_AP_NM_ADDRESS_3,

		SOFT_AP_NM_ADDRESS_4);

	ESP_ERROR_CHECK(tcpip_adapter_set_ip_info(TCPIP_ADAPTER_IF_AP, &ipAddressInfo));

    ESP_ERROR_CHECK(tcpip_adapter_dhcps_start(TCPIP_ADAPTER_IF_AP));

    ESP_ERROR_CHECK(esp_event_loop_init(wifiEventHandler, NULL));

	wifi_init_config_t wifiConfiguration = WIFI_INIT_CONFIG_DEFAULT();

	ESP_ERROR_CHECK(esp_wifi_init(&wifiConfiguration));

	ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));

	wifi_config_t apConfiguration = {

        .ap = {

            .ssid = SOFT_AP_SSID,

            .password = SOFT_AP_PASSWORD,

			.ssid_len = 0,

			//.channel = default,

			.authmode = WIFI_AUTH_WPA2_PSK,

			.ssid_hidden = 0,

			.max_connection = 1,

			.beacon_interval = 150,

        },

    };

	ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &apConfiguration));

	ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));

	ESP_ERROR_CHECK(esp_wifi_start());

}



void app_main(void){

	launchSoftAp();

	while(1) vTaskDelay(10);

}

Hope it helps
Best regards
Verde