BrainBox | web application that lets you annotate and segment 3D brain | Collaboration library

It sounds like you're trying to do quite a few things at once. To paraphrase what you want: to achieve (looking at both your question, your sample code and your comment)

• When your application starts, you want it to connect to a collection of different devices automatically
• When running, users can connect to and configure (the right) device
• Ensure that connections are closed when the application stops

Also your question is rather open ended and from your first statement, I'm going to assume that you're a beginner. I know that it's quite dry, but you are going to have to look up the documentation for the hardware you're using. Luckily, it looks quite comprehensive

1. You need to give your class a more representative name. E.g. BrainboxController or BrainboxManager as, by the sounds of it, that is what it's for.
2. Looks like BB400 is one of the possible hardware devices, it is part of an inheritance hierarchy, so you don't want to restrict yourself to just that
3. I would avoid doing a lot of work in the constructor, it makes it harder to find problems
4. Use a dictionary to store your devices, that's how you'll "refer to each device at a later time"