Recommendation for remote or wired digital I/O to combine with NR running on Raspberry Pi

Thanks for your notification.
For sure, I am a Node-RED user/code contributor as well as a netGate company runner.Our company named chvda , locates in Beijing, China, and focus on embedded system R&D.
I will obey the forum rules, especially when talking about our products.
By the way, if I need to do some commercial activities,is there any dos and don'ts I should pay special attention to?