Go to Data Explorer → MQTT Tools to start. You can connect to your own broker, if you wish, but our system has a native SpartkplugB MQTT Built-In Broker that you can use.
Out platform also offers a MQTT Publisher Simulator, that has customizable data being published. Simply click both of the green "start" buttons to start the Broker and Simulator.
Once you've done so, click Connect to see and browse the generated data.