sp4 and sp4b classes not found, discover call fails as a result

[EdgarVerona]

Not sure how they're supposed to be implemented, but I get an error when I call the /discover endpoint because they're not defined in init.py.

Removing the lines in get_devices() that refer to them and rebuilding/redeploying the image worked, though at the expense of losing those devices (which I personally didn't care about, but others might).