I developed HackMaster Pi, an open source IoT security testing tool based on the Raspberry Pi Zero 2 W, for the purpose of IoT security learning. By combining Bluetooth, Wi-Fi, Infrared, and RFID features at a low cost, users can learn about attacks and defenses of IoT devices on a cheap budget.
For links to the slide show, see https://github.com/1PingSun/HackMaster-Pi/blob/main/keynote/HackMaster Pi Introduction Keynote.pdf or Google Drive cloud link: https://drive.google.com/drive/folders/1ZqCFNfG6tz7VR5vZua2AAn2tCn7cCu9W?usp=sharing (Notice: The English content is automatically translated and may contain inaccuracies or misinterpretations. Please refer to the original version for the most accurate information.)