homebridge-eveatmo/service/eveatmo-co2.js

Homebridge plugin which adds a Netatmo weatherstation as HomeKit device and tries to act like Elgato Eve Room/Weather

'use strict';

var homebridge;
var Characteristic;

module.exports = function(pHomebridge) {
  if (pHomebridge && !homebridge) {
    homebridge = pHomebridge;
    Characteristic = homebridge.hap.Characteristic;
  }

  class CarbonDioxideService extends homebridge.hap.Service.CarbonDioxideSensor {
    constructor(accessory) {
      super(accessory.name + ' Carbon Dioxide');
      this.accessory = accessory;

      this.getCharacteristic(Characteristic.CarbonDioxideDetected)
        .on('get', this.getCarbonDioxideDetected.bind(this))
        .eventEnabled = true;

      var co2LevelCharacteristic = this.getCharacteristic(Characteristic.CarbonDioxideLevel) ||
                this.addCharacteristic(Characteristic.CarbonDioxideLevel);

      co2LevelCharacteristic.on('get', this.getCarbonDioxideLevel.bind(this))
        .eventEnabled = true;
    }

    updateCharacteristics() {
      this.getCharacteristic(Characteristic.CarbonDioxideDetected)
        .updateValue(this.transformCO2ToCarbonDioxideDetected());
      this.getCharacteristic(Characteristic.CarbonDioxideLevel)
        .updateValue(this.accessory.co2);
    }

    getCarbonDioxideDetected(callback) {
      this.accessory.refreshData((err,data) => {
        callback(err, this.transformCO2ToCarbonDioxideDetected());
      });
    }

    getCarbonDioxideLevel(callback) {
      this.accessory.refreshData((err,data) => {
        callback(err, this.accessory.co2);
      });
    }

    transformCO2ToCarbonDioxideDetected() {
      return (this.accessory.co2 >= this.accessory.config.co2_alert_threshold ? Characteristic.CarbonDioxideDetected.CO2_LEVELS_ABNORMAL : Characteristic.CarbonDioxideDetected.CO2_LEVELS_NORMAL);
    }
  }

  return CarbonDioxideService;
};