izar_meter.h

#include "esphome.h"
#include "Arduino.h"
#include "ArduinoJson.h"
#include "izar_wmbus.h"
 

int  meterId = 0xFFFFFFFF;      //comment to determine the ID of your counter, enter the ID (instead FFFFFFFF) and uncomment the line  

int waterUsage_temp;
int waterUsage;
IzarWmbus reader;

namespace MyTextData {
      TextSensor *my_text_sensor = new TextSensor();
    }
    
class MyTextSensor :public Component, public TextSensor {
      public:
        TextSensor *my_text_sensor = MyTextData::my_text_sensor;
    };
    
class MySensor :public Component, public Sensor {
      public: Sensor *my_sensor = new Sensor();
      
  void setup() {
//       reader.init(0);                                 //to display all meters in range
       reader.init(meterId);                             //uncomment the line after identifying your meter
  }
  
IzarResultData data;

  void loop() {

    FetchResult result = reader.fetchPacket(&data);
    if (result == FETCH_SUCCESSFUL) {
        waterUsage_temp = data.waterUsage;
        if ((waterUsage_temp > 0) and (waterUsage_temp < 10000000)) {     //data filter
            waterUsage = waterUsage_temp;
        } 
       
//        int meterId = data.meterId;                 //Uncomment from reading all the meters in the range. Comment this line after identifying your meter ID.                            
        char ID_text[32];
        itoa(meterId, ID_text, 16);
       
        my_sensor->publish_state(waterUsage);
        MyTextData::my_text_sensor->publish_state(ID_text);
      
    } else {
        delay(300);
        reader.ensureRx(); 
    }
  }
};