The program MQTT.fx provides a graphical representation to receive and send MQTT messages.
With an MQTT broker e.g. Mosquitto you can your devices by means of a firmware, e.g. Control Tasmota or ESP Easy in your Smart Home System (openHAB, ioBroker, Home Assistant ...).
First, you create a profile and connect with your broker, who is e.g. running on a Raspberry Pi.
Once the connection has been established, a connection or message exchange can be made via publish and subscribe.
link to MQTT.fx: https://mqttfx.jensd.de/
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