ESP8266 Community Forum

Hello all I am having an issue understanding how the ESP8266 12e sleeps and wakes and runs functions on wake. I am a C# developer so I know programming I am just having a hard time understanding how this works.
I made a simple application that sleeps and when it detects GPIO13 it should wake but it does not.

#include <ESP8266WiFi.h>

extern "C" {
#include "gpio.h"
}

extern "C" {
#include "user_interface.h"
}
#define LIGHT_WAKE_PIN 13

void sleep()
{
wifi_fpm_set_sleep_type(LIGHT_SLEEP_T);
wifi_fpm_open();
gpio_pin_wakeup_enable(GPIO_ID_PIN(LIGHT_WAKE_PIN), GPIO_PIN_INTR_LOLEVEL);
wifi_fpm_do_sleep(0xFFFFFFF);
}

void setup()
{
Serial.begin(115200);
delay(100);
Serial.println("scanning for wifi");
WiFi.scanNetworks();
}

void loop()
{
delay(100);
sleep();
if(digitalRead(LIGHT_WAKE_PIN))
{
wifi_fpm_do_wakeup();
wifi_fpm_close();
Serial.println("scanning for wifi");
WiFi.scanNetworks();
}
}

I can not figure out what I am doing wrong on this, should I be using a different GPIO port? I am just not sure how to fix this. Any help would be great!