Figure 1. Internet-Based Temperature Control Lab (iTCLab) Kit The testing programming and setting on the iTCLab Kit are shown in Figure 3. Through the serial monitor on the PC, it can be seen the temperature readings from the iTCLab Kit. Some important program snippets include the following command line: according to the topic created, on the IoT MQTT Panel. If it is appropriate, monitoring and controlling on/off via cellphone can be carried out. From the system architecture in Figure 2, to run as desired, a program using the Arduinc programming language is first made. The program contains temperature data retrieval. Equippec with a way of connecting to IoT. The program is embedded in the iTCLab Kit. When run, if the settings are correct, it will successfully connect to the MQTT Broker. Next, settings are made according to the topic created, on the IoT MQTT Panel. If it is appropriate, monitoring and controlling on/off via cellphone can be carried out. Figure 3. System testing using the iTCLab Kit Next, settings are made according to the topic created, on the loT MQTT Panel. The selection of the panel used, and the settings that must be made on the IoT MQTT Panel, are shown in Figures 4 to Figure 6. If the settings are appropriate, On/Off monitoring and control via Mobile Phones can be carried out. In this experiment, an example of the results of On/Off temperature monitoring and control is shown in Figure 7. Figure 4. Panels used in loT MQTT Panel Figure 5. Connection settings in loT MQTT Panel Figure 7. Experimental results on the IoT MQTT Panel
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