this is my first Topic and I am a really beginner...
I used different code examples to build an WLAN-AP and a Socket-Server based on kolban's examples:
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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);
}
when i connect to the AP and type in:
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roge@rg-tp:~$ nc 192.168.4.1 8001
Does anybody has an idea?
Thank You!
roge
