Being involved with Linux for a few years, I can tell you I understand how these projects work. As with Linux you have thousands of people all around the world working on small projects, and somebody, somewhere is in charge of maintaining each project. then another group takes these projects and combines them into a bigger project, and then an even bigger project.
I don't know how Wang's project is setup, but it sounds like one group is working on the WIFI part, and another is working on the Thermometer part, and maybe somebody is working on building the cases. It's just like any project, it's a team effort.
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