ESP32 Forum

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#include <lwip/sockets.h>
#include <esp_log.h>
#include <string.h>
#include <errno.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>

#include <esp_event.h>
#include <esp_event_loop.h>
#include <esp_system.h>
#include <esp_wifi.h>
#include <nvs_flash.h>
#include <stdio.h>
#include <string.h>
#include "driver/ledc.h"
#include "sdkconfig.h"

#define PORT_NUMBER 8001

static char tag[] = "socket_server";

static void sendData(int socket) {
	char text[80];
	int i;
	for(i=1;i<=10;i++){
		sprintf(text, "Message %d\n", i);
		send(socket, text, strlen(text), 0);
		vTaskDelay(1000/portTICK_PERIOD_MS);
	}
	close(socket);
}

esp_err_t wifi_event_handler(void *ctx, system_event_t *event) {
    return ESP_OK;
}

/**

Creates a new Wifi-AP on ESP32

*/
void wifi_start_access_point() {
    wifi_config_t wifi_config = {
        .ap = {
            .ssid="_ ESP32",
            .ssid_len=0,
            .password="12345678",
            .channel=6,
            .authmode=WIFI_AUTH_WPA2_PSK,
            .ssid_hidden=0,
            .max_connection=4,
            .beacon_interval=100
        }
    };

    tcpip_adapter_init();
    esp_event_loop_init(wifi_event_handler, NULL);
    wifi_init_config_t wifi_init_config = WIFI_INIT_CONFIG_DEFAULT();
    esp_wifi_init(&wifi_init_config);
    esp_wifi_set_storage(WIFI_STORAGE_RAM);
    esp_wifi_set_mode(WIFI_MODE_AP);
    esp_wifi_set_config(WIFI_IF_AP, &wifi_config);
    esp_wifi_start();
}

/**
 * Create a listening socket.  We then wait for a client to connect.
 * Once a client has connected, we then read until there is no more data
 * and log the data read.  We then close the client socket and start
 * waiting for a new connection.
 */
void socket_server_task(void *ignore) {
	struct sockaddr_in clientAddress;
	struct sockaddr_in serverAddress;

	// Create a socket that we will listen upon.
	int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (sock < 0) {
		ESP_LOGE(tag, "socket: %d %s", sock, strerror(errno));
		goto END;
	}

	// Bind our server socket to a port.
	serverAddress.sin_family = AF_INET;
	serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
	serverAddress.sin_port = htons(PORT_NUMBER);
	int rc  = bind(sock, (struct sockaddr *)&serverAddress, sizeof(serverAddress));
	if (rc < 0) {
		ESP_LOGE(tag, "bind: %d %s", rc, strerror(errno));
		goto END;
	}

	// Flag the socket as listening for new connections.
	rc = listen(sock, 5);
	if (rc < 0) {
		ESP_LOGE(tag, "listen: %d %s", rc, strerror(errno));
		goto END;
	}

	while (1) {
		// Listen for a new client connection.
		ESP_LOGD(tag, "Waiting for new client connection");
		socklen_t clientAddressLength = sizeof(clientAddress);
		int clientSock = accept(sock, (struct sockaddr *)&clientAddress, &clientAddressLength);
		if (clientSock < 0) {
			ESP_LOGE(tag, "accept: %d %s", clientSock, strerror(errno));
			goto END;
		}
		sendData(clientSock);
	}
	END:
	vTaskDelete(NULL);
}

//--------
//  Main
//--------

void app_main() {
    nvs_flash_init();

    
    wifi_start_access_point();
    //socket_server_task();
    vTaskDelete(NULL);
}

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roge@rg-tp:~$ nc 192.168.4.1 8001

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wifi_start_access_point();
    socket_server_task();    
    vTaskDelete(NULL);