请问如何每5秒发送一次http请求？

我想知道我如何每 5 秒（左右）发送一个 http 请求？我目前发送 http 请求的方法：

本地空ICACHE_FLASH_ATTR
tcp_connect_cb（void *arg）{
   os_printf("Connected to TCP Server.n");
   struct espconn *conn = (struct espconn*)arg;
   char requestText[SIZE];
   os_sprintf(requestText,"GET /toggleLED.php?getnumber /HTTP/1.1rnUser-Agent: curl/7.37.0rnHost: %srnAccept: */*rnrn",DOMAIN);
   espconn_send(conn,requestText,SIZE);
}

本地空ICACHE_FLASH_ATTR
tcp_sent_cb（void *arg）{
   os_printf("Send command is out.n");
}

本地空ICACHE_FLASH_ATTR
tcp_recv_cb（void *arg， char *data， unsigned short len）{
   struct espconn *conn = (struct espconn*)arg;
   //do some stuff
}

本地空ICACHE_FLASH_ATTR
tcp_recon_cb（void *arg， sint8 err）{
   os_printf("TCP reconnected %dn", err);
}

本地空ICACHE_FLASH_ATTR
tcp_discon_cb（void *arg）{
   os_printf("TCP disconnected.n");
}

本地空ICACHE_FLASH_ATTR
getHostByNameCB（const char *name， ip_addr_t *ip，void *arg）{
   static esp_tcp tcp;
   struct espconn *conn = (struct espconn*)arg;
   conn->type=ESPCONN_TCP;
   conn->state=ESPCONN_NONE;
   conn->proto.tcp=&tcp;
   conn->proto.tcp->local_port=espconn_port();
   conn->proto.tcp->remote_port=80;
   os_memcpy(conn->proto.tcp->remote_ip,&ip->addr,4);

   espconn_regist_connectcb(conn,tcp_connect_cb);
   espconn_regist_recvcb(conn,tcp_recv_cb);
   espconn_regist_sentcb(conn,tcp_sent_cb);
   espconn_regist_reconcb(conn,tcp_recon_cb);
   espconn_regist_disconcb(conn,tcp_discon_cb);
   espconn_connect(conn);
}

本地空ICACHE_FLASH_ATTR
check_ip（无效）{
   struct ip_info ipconf;
   bool res = wifi_get_ip_info(STATION_IF, &ipconf);
   if(!res)
      os_printf("No WiFi Connection.");
   else{
      if(wifi_station_get_connect_status() == STATION_GOT_IP && ipconf.ip.addr != 0){
         os_printf("Got IP Address.n");
         static struct espconn con;
         static ip_addr_t ip;
         espconn_gethostbyname(&con,DOMAIN,&ip,getHostByNameCB);
      } else {
         os_timer_setfn(&timer,(os_timer_func_t*)check_ip,NULL);
         os_timer_arm(&timer,100,0); //recall function after 100ms, don't repeat
      }
   }
}

本地空ICACHE_FLASH_ATTR
set_station_config（void）{
    struct station_config stationConf;
    char *SSID = "";
    char *PW = "";

    stationConf.bssid_set = 0;

    os_memcpy(&stationConf.ssid,SSID,32);
    os_memcpy(&stationConf.password,PW,64);
    wifi_station_set_config(&stationConf);
    wifi_station_connect();
}

void user_init（void）{
    wifi_set_opmode(STATION_MODE);
    set_station_config();
    check_ip();
}