I am waiting for my mesh devices. What I have been doing is making a machine learning curriculum for high school students. see website of examples at https://www.rocksetta.com/tensorflowjs/
Since tensorflowjs uses javascript it works fairly well on RPI3 and mobile devices. Try https://hpssjellis.github.io/face-api.js-for-beginners/ on your cell phone. Wheras the Photon and Mesh devices probably can’t do much machine learning on their own with a websocket or database your could probably do a fair bit of machine learning data collection. with feedback.
Will be interesting to see where all this goes.