CHNAGE: added size comparism

src/app/_models/mqtt_base.ts

@@ -56,6 +56,12 @@ export class MQTTEntity implements iMQTTEntityBase {
     }
     return jsonObject;
   }
+
+  get size(): number {
+    this._size = JSON.stringify(this.toJSON()).length;
+    return this._size;
+  }
+
   getProperty(name: string): any {
     if (!this.attrs.has(name)) return;
     return this[name as keyof this];