getInterestingTopics() {
        let topics = {};

        if (this.settable) {
            topics[this.getBaseTopic() + "/set"] = async (value) => {
                try {
                    await this.setHomie(value);
                } catch (err) {
                    Logger.error("MQTT: Error while handling " + this.getBaseTopic() + "/set", {
                        payload: value,
                        error: err
                    });
                }
            };
        }

        return topics;
    }
Return topics that this handle is interested in. This contains by default the /set topic if this handle is
settable. If more topics are desired, it can be overridden and extended.

@public
@return {object}