Where do you connect pink wire?
If you want the wall switch to turn off the light/fan, then hook the pink wire in the box to the black wire on your controller. If you want to prevent the switch from turning off the light/fan then connect black to black.
Is pink positive or negative?
Even a very faint, pink Test Line and a blue Control Line is a POSITIVE result.
What’s the pink wire?
In commercial wiring a pink might typically be a switch let that would be positive when circuit is closed. The neutral conductors in commercial are usually white or gray.