I would say subscribe to a couple subreddits. The level of discussion is not as to the point as I find HN tends to have (which is a good thing in my opinion), but there are quite a few different ones with varying levels of discussion and acceptance. So I wouldn't expect the HN version of hardware there, but something different.
Note that there subreddits related to a specific product where discussion focuses on that specific hardware. They tend to by hobbyist, but that's as close as you can get.
To start you off, I subscribe to the following:
https://www.reddit.com/r/electronics/
https://www.reddit.com/r/AskElectronics/
https://www.reddit.com/r/ECE/
https://www.reddit.com/r/DSP/
https://www.reddit.com/r/ComputerEngineering/
https://www.reddit.com/r/FPGA/
Note that there subreddits related to a specific product where discussion focuses on that specific hardware. They tend to by hobbyist, but that's as close as you can get.
https://www.reddit.com/r/esp32/
https://www.reddit.com/r/esp8266/