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echo "on 0" | sudo cec-client -s -d 1

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echo "hdmi_ignore_cec_init=1" >> /boot/config.txt

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hdmi_ignore_cec_init

Setting hdmi_ignore_cec_init to 1 will stop the initial active source message being sent during bootup. This prevents a CEC-enabled TV from coming out of standby and channel-switching when you are rebooting your Raspberry Pi.

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#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <IRremoteESP8266.h>
#include <IRsend.h>

const char* ssid = "2,4GzSSID";
const char* password = "PASSWORT";

const char* mqtt_server = "IPADRESSEDESMQTTSERVERS";

//IR LED on Pin  D2
#define IR_LED 4

IRsend irsend(IR_LED);

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

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

  randomSeed(micros());

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

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.println();
  //Message
  byte* p = (byte*)malloc(length);
  std::string message ( reinterpret_cast<char const*>(payload), length ) ;
  //AppleTV Commands
  if (strcmp(topic,"/netzwerk/wohnzimmer/tv/poweron/command")==0){
    if (message == "ON") {
      irsend.sendNEC(0x77E1403C, 32); //Hier den passenden IR Code eingeben :-)
      client.publish("/netzwerk/wohnzimmer/tv/poweron/state","OFF");
      Serial.println("poweron");
    }
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "WeMos_TV_WZ";
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
        //AppleTV
        client.subscribe("/netzwerk/wohnzimmer/tv/poweron/command");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  irsend.begin();
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
      setup_wifi();
  }
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
}