[podiki]

Fun (or I guess "fun" depending on the outcome here) detective story. But would be nice to have the context of what sort of company this Pi was found at. What might be a motive to be tracking devices and be inside the network?

[juliand]

OP provided a little bit of more context in another comment. It was a public school.

[podiki]

Well that is worrying in a way I didn't expect

[sitzkrieg]

i have seen redteams do this for persistence