IoT devices for security research (UART / SPI)

Hello Reddit Community,

I am currently working on a thesis where I need to demonstrate an attack on an IoT device that poses a security risk. Specifically, I am looking for low-cost IoT devices that allow access via UART or firmware dumping from the chip, modification, and reflashing with a backdoor. The goal is to retrieve data and highlight potential security vulnerabilities that could affect public safety by compromising user data.

I have identified a few types of devices that might fit this criteria, such as cameras and routers, but I am open to other suggestions. Do any of you have specific models in mind that are well-documented and allow for this kind of access? For example, I know the Hikvision IoT Camera is a good candidate, but I'm looking for more options to explore, especially those that are not excessively priced.

Please share any models you are familiar with that meet these criteria. Any insights or personal experiences with these devices would be greatly appreciated.

Thank you in advance for your help!