main.c

#include <string.h>

#include "freertos/FreeRTOS.h"

#include "esp_event.h"
#include "esp_event_loop.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "nvs_flash.h"

#include "./../../../mongoose.h"

#define WIFI_SSID "ssid"
#define WIFI_PASS "pass"

#define MG_LISTEN_ADDR "80"

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

static void mg_ev_handler(struct mg_connection *nc, int ev, void *p) {
  static const char *reply_fmt =
      "HTTP/1.0 200 OK\r\n"
      "Connection: close\r\n"
      "Content-Type: text/plain\r\n"
      "\r\n"
      "Hello %s\n";

  switch (ev) {
    case MG_EV_ACCEPT: {
      char addr[32];
      mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr),
                          MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
      printf("Connection %p from %s\n", nc, addr);
      break;
    }
    case MG_EV_HTTP_REQUEST: {
      char addr[32];
      struct http_message *hm = (struct http_message *) p;
      mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr),
                          MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
      printf("HTTP request from %s: %.*s %.*s\n", addr, (int) hm->method.len,
             hm->method.p, (int) hm->uri.len, hm->uri.p);
      mg_printf(nc, reply_fmt, addr);
      nc->flags |= MG_F_SEND_AND_CLOSE;
      break;
    }
    case MG_EV_CLOSE: {
      printf("Connection %p closed\n", nc);
      break;
    }
  }
}

void app_main(void) {
  nvs_flash_init();
  tcpip_adapter_init();
  ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));

  /* Initializing WiFi */
  wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
  ESP_ERROR_CHECK(esp_wifi_init(&cfg));
  ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
  ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
  wifi_config_t sta_config = {
      .sta = {.ssid = WIFI_SSID, .password = WIFI_PASS, .bssid_set = false}};
  ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &sta_config));
  ESP_ERROR_CHECK(esp_wifi_start());
  ESP_ERROR_CHECK(esp_wifi_connect());

  /* Starting Mongoose */
  struct mg_mgr mgr;
  struct mg_connection *nc;

  printf("Starting web-server on port %s\n", MG_LISTEN_ADDR);

  mg_mgr_init(&mgr, NULL);

  nc = mg_bind(&mgr, MG_LISTEN_ADDR, mg_ev_handler);
  if (nc == NULL) {
    printf("Error setting up listener!\n");
    return;
  }
  mg_set_protocol_http_websocket(nc);

  /* Processing events */
  while (1) {
    mg_mgr_poll(&mgr, 1000);
  }
}