The recommended MQTT Client software for the IoT modules is MQTT.fx. MQTT.fx is an easy-to-use software that allows publishing and subscribing to various topics. Alternatively, an MQTTBox can be used as a replacement.
USB Serial Port can be used for debugging IoT kits. For this, a serial terminal is needed. One of the most advanced serial terminals is a RealTerm, allowing view and log data in different formats and manually reset the IoT modules.