Wemos d1 mini Adafruit Mqtt

Hi, ich möchte eine led mit adafruit steuern, jedoch macht das ganze 
probleme. Im Wlan verbindet der wemos d1 mini sich und auch Mqtt 
connectet, jedoch klappt nach  MQTT_connect(); nichts in void loop mehr.



#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

#define WIFI_SSID "FRITZ!Box 7590 SZ"
#define WIFI_PASS "PW"

#define MQTT_SERV "io.adafruit.com"
#define MQTT_PORT 1883
#define MQTT_NAME "sntlyeet"
#define MQTT_PASS "Key"

int led = 0;

WiFiClient client;
Adafruit_MQTT_Client mqtt(&client, MQTT_SERV, MQTT_PORT, MQTT_NAME, 
MQTT_PASS);

Adafruit_MQTT_Subscribe onoff = Adafruit_MQTT_Subscribe(&mqtt, MQTT_NAME 
"/f/ONOF");
Adafruit_MQTT_Publish LightsStatus = Adafruit_MQTT_Publish(&mqtt, 
MQTT_NAME "/f/LightsStatus");


void setup()
{
  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);


  //Connect to WiFi
  Serial.print("\n\nConnecting Wifi>");
  WiFi.begin(WIFI_SSID, WIFI_PASS);
  digitalWrite(LED_BUILTIN, LOW);

  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(">");
    delay(50);
  }

  Serial.println("OK!");

  //Subscribe to the onoff topic
  mqtt.subscribe(&onoff);

  pinMode(led, OUTPUT);
  digitalWrite(LED_BUILTIN, HIGH);
  digitalWrite(led, LOW);

}

void loop()
{
  //Connect/Reconnect to MQTT
  MQTT_connect();

  //Read from our subscription queue until we run out, or
  //wait up to 5 seconds for subscription to update
  Adafruit_MQTT_Subscribe * subscription;
  while ((subscription = mqtt.readSubscription(5000)))
  {
    //If we're in here, a subscription updated...
    if (subscription == &onoff)
    {
      //Print the new value to the serial monitor
      Serial.print("onoff: ");
      Serial.println((char*) onoff.lastread);

      //If the new value is  "ON", turn the light on.
      //Otherwise, turn it off.
      if (!strcmp((char*) onoff.lastread, "ON"))
      {
        //active low logic
        digitalWrite(led, HIGH);
        LightsStatus.publish("ON");
      }
      else if (!strcmp((char*) onoff.lastread, "OFF"))
      {
        digitalWrite(led, LOW);
        LightsStatus.publish("OFF");

      }
      else
      {
        LightsStatus.publish("ERROR");
      }
    }
    else
    {
      //LightsStatus.publish("ERROR");
    }
  }
  //  if (!mqtt.ping())
  //  {
  //    mqtt.disconnect();
  //  }
}


void MQTT_connect()
{

  //  // Stop if already connected
  if (mqtt.connected() && mqtt.ping())
  {
    //    mqtt.disconnect();
    return;
  }

  int8_t ret;

  mqtt.disconnect();

  Serial.print("Connecting to MQTT... ");
  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) // connect will return 0 for 
connected
  {
    Serial.println(mqtt.connectErrorString(ret));
    Serial.println("Retrying MQTT connection in 5 seconds...");
    mqtt.disconnect();
    delay(5000);  // wait 5 seconds
    retries--;
    if (retries == 0)
    {
      ESP.reset();
    }
  }
  Serial.println("MQTT Connected!");
}