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I think those devices could use the psk option?

It really depends... I'm sure they're not going to be using one single key for everybody; it'll be 802.1X, which a lot of devices don't support.

The portal is mist.com, so I'd assume it's using a form of MPSK - https://www.mist.com/documentation/multi-psk/

Yeah, assuming they're not just random wifi devices people have around MIT campus.