I have a lot of YoLink stuff, like @Sam_Bam mentioned. I have door sensors linked to light switches so they turn on the lights when you go into the garage or my shop. Outdoor motion sensors to turn on lights via Home Assistant. A motion sensor in my mailbox. I also have the speaker hubs which can make customized voice announcements. I have one smoke detector in my garage above my PV inverter and batteries.
They all work well. YoLink is working on a local hub with cell phone backup which will handle automation without the need for an internet connection. I have one but it isn’t ready for anything yet. Too many bugs.