Sharing does not work

🐛 Bug

Please reproduce using the BoringModel and post here

Currently, on_batch_start is called along on_train_batch_start during training but doesn't for test and validation.
It results in a different number of function calls betwee

Is your feature request related to a problem? Please describe.

merger happened long back, and predates the earliest supported versions.

Describe the solution you'd like
remove references to io.js from the docs, aiming to reduce confusion.

Describe alternatives you've considered
status-quo.

Describe the bug

I've been trying to get the joystick example under tools to work for about a week now. I feel like there are things missing from the readme, it definitely doesn't work right out of the box.
After following all the steps, Running Boardd without sudo gives me Permission Denied for one

Then running it with sudo does show that the panda is found and the correct panda with