NodeMCU Sprachsteuerung

#include <ESP8266WiFi.h>

const char* SSID = *WlanName*; //hier dein Wlannamen einfügen
const char* PSK = *WlanPasswort*; //hier dein Wlanpasswort einfügen

WiFiServer server(80);

const int LampenPin = 5;
const int SLPin = 4;

void setup() {
  WiFi.mode(WIFI_STA);

  Serial.begin (9600);
  pinMode(LampenPin, OUTPUT);
  digitalWrite(LampenPin, 0);
  pinMode(SLPin, OUTPUT);
  digitalWrite(SLPin, 0);

  initWiFi();
}

void loop() {
  WiFiClient client = server.available();
  if(!client){
    return;
  }

  if(WiFi.status() != WL_CONNECTED){
    initWiFi();
  }

  String request = client.readStringUntil('\r');
  client.flush();

  String arrayString;
  if(request.indexOf("licht-an")>=0){
    digitalWrite(LampenPin, 1);
    Serial.println("1 an");
    arrayString = "on";
  }
  else if(request.indexOf("licht-aus")>=0){
    digitalWrite(LampenPin, 0);
    Serial.println("1 aus");
    arrayString = "off";
  }
  else if(request.indexOf("steckerleiste-an")>=0){
    digitalWrite(SLPin, 1);
    Serial.println("2 an");
    arrayString = "on";
  }
  else if(request.indexOf("steckerleiste-aus")>=0){
    digitalWrite(SLPin, 0);
    Serial.println("2 aus");
    arrayString = "off";
  }
    else if(request.indexOf("alles-aus")>=0){
    digitalWrite(SLPin, 0);
    digitalWrite(LampenPin, 0);
    Serial.println("alles aus");
    arrayString = "off";
  }
    else if(request.indexOf("abbo")>=0){
    digitalWrite(SLPin, 1);
    Serial.println("2 an");
    arrayString = "on";
  }

  client.println(arrayString);
  client.stop();

  Serial.println(request);
  Serial.println("HTTP/1.1 200 OK");
  Serial.println("Content-type: text/html");
  Serial.print("Content-Length: ");
  Serial.println(arrayString.length());
  Serial.println();
  Serial.println(arrayString);
}

void initWiFi(){
  WiFi.begin(SSID, PSK);

  while(WiFi.status() != WL_CONNECTED){
    delay(500);
  }

  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  server.begin();
}