I had a question about the type of Product we create…
Is it possible to use both GPIOs & UART in one product?
While making a product which is both GPIO and UART in product type is not possible, you can use the Bolt Cloud API to achieve almost any application you can think of.
Here is a link to the documentation for the Bolt Cloud API
Could you clarify why you want a product type which has both UART and GPIO? I might be able to help you better if I know this info.