Negativ value of temperature about homebridge-temperature-cmd HOT 5 OPEN

getServices: function() {
    var services = [],
        informationService = new Service.AccessoryInformation();

    informationService
        .setCharacteristic(Characteristic.Manufacturer, this.manufacturer)
        .setCharacteristic(Characteristic.Model, this.model)
        .setCharacteristic(Characteristic.SerialNumber, this.serial);
    services.push(informationService);

    temperatureService = new Service.TemperatureSensor(this.name);
    temperatureService
        .getCharacteristic(Characteristic.CurrentTemperature)
        .on('get', this.getState.bind(this));

    // Required to support negative temperature values:
    var characteristic = temperatureService.getCharacteristic(Characteristic.CurrentTemperature);
    characteristic.props.minValue = -50;

    services.push(temperatureService);

    return services;
}