_topicChange(msg) {
    this.uibuilder.log("trace", this.localName, "Topic msg received: '".concat(msg.topic, "'"), msg);
    this.value = msg.payload;
    this.showVar();
    if (this.report === true) this.uibuilder.send({ topic: msg.topic, payload: this.value || void 0, source: this.localName, id: this.id });
  }
Process watched uibuilder msg.topic received
@param {object} msg The value of the managed uibuilder variable