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I also would find it very useful to have more capability in this direction. There are add-ons to do some of this (or there used to be), but it really seems like core functionality for stats, data science, and so on.
A related note: It seems that CDF Player 9.0.1 doesn't work in the latest versions of Chrome, at least on OSX. This may be related to Chrome's recent transition to 64-bit mode.
A follow-up: I'm able to load the library and connect to a device again, though I don't believe I changed anything. My current guess is that I need to pause between loading the library and calling any other functions. I can run BLEDiscover, then...