Hello community
I have been connecting to a WPA2 network with an ESP8266 module and I found the code that works.
But...
When I connect and spend 20 seconds. This overflows and restarts.
Looking for I found that it could be memory or voltage
but from memory there is only that and if it is well connected
HELP ME 
#include <ESP8266WiFi.h>
#include <WebSocketsServer.h>
#include <WiFiClient.h>
extern "C" {
#include "user_interface.h"
#include "wpa2_enterprise.h"
}
// SSID to connect to
static const char* ssid = "*********";
// Username for authentification
static const char* username = "********";
// Password for authentication
static const char* password = "*********";
void setup() {
lcd.begin (16,2);
// put your setup code here, to run once:
Serial.begin(9200);
// WPA2 Connection starts here
// Setting ESP into STATION mode only (no AP mode or dual mode)
wifi_set_opmode(STATION_MODE);
struct station_config wifi_config;
memset(&wifi_config, 0, sizeof(wifi_config));
strcpy((char*)wifi_config.ssid, ssid);
wifi_station_set_config(&wifi_config);
wifi_station_clear_cert_key();
wifi_station_clear_enterprise_ca_cert();
wifi_station_set_wpa2_enterprise_auth(1);
wifi_station_set_enterprise_identity((uint8*)username, strlen(username));
wifi_station_set_enterprise_username((uint8*)username, strlen(username));
wifi_station_set_enterprise_password((uint8*)password, strlen(password));
wifi_station_connect();
// WPA2 Connection ends here
// Wait for connection AND IP address from DHCP
Serial.println();
Serial.println("Waiting for connection and IP Address from DHCP");
while (WiFi.status() != WL_CONNECTED) {
delay(2000);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
IPAddress myAddr = WiFi.localIP();
}
void loop() {
delay(2000);
}
Error
Exception (3):
epc1=0x40204e81 epc2=0x00000000 epc3=0x00000000 excvaddr=0x40070151 depc=0x00000000
>>>stack>>>
ctx: sys
sp: 3fffec80 end: 3fffffb0 offset: 01a0
3fffee20: 00000002 40100ddc 000000a0 3ffe8004
3fffee30: 40100e10 0000049c 000003fe 40204fab
3fffee40: 0000049c 00001000 000003fe 40100e10
............