ESP 8266 PIR Motion sensor + MQTT

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I use the following code … for the PIR sensor, if reads GPIO 14 on a SonOff(which is ESP8266 based) which is connected to the PIR, as for the MQTT just use and modify the example code, it’s the same for most use cases. A good example would be KmanOzs SonOff code on this forum (https://github.com/KmanOz/Sonoff-HomeAssistant)

void pir_readPIR()
{
  char log[LOGSZ];

  pirval = digitalRead(PIR_PIN);  // read input value

    if (pirval == HIGH) 
    {            // check if the input is HIGH
      if (pirState == LOW) 
      { 
        digitalWrite(LED, LOW);  // turn LED ON
        // we have just turned on
        addLog("Motion detected!");
        digitalWrite(RELAY,HIGH); // turn relay on
        sprintf(log, "on");
        addLog(log);
        // Publish the Relay state to HA
        mqttClient.publish(MQTT::Publish(PUB_PREFIX"/"MQTT_TOPIC,log).set_retain().set_qos(1));
        ESP.wdtFeed();
        // We only want to turn on light on the output change, not state
        pirState = HIGH;      
      }
    } 
    else 
    {
      if (pirState == HIGH)
      {

        digitalWrite(LED, HIGH); // turn LED OFF
        // we have just turned off
        addLog("Motion detected Ended!");
        digitalWrite(RELAY,LOW); // turn relay off
        sprintf(log, "off");
        addLog(log);
        // Publish the Relay state to HA
        mqttClient.publish(MQTT::Publish(PUB_PREFIX"/"MQTT_TOPIC,log).set_retain().set_qos(1));
        ESP.wdtFeed();
     
        // We only want to turn on the light on the output change, not state
        pirState = LOW;
      }
    }
}