Use phone as a controller for 3ds?

I know it is possible to use a PC to conmect a controller to our 3ds,but is it possible to do it on our phone?

Like,i installed a controller app on my phone to simulate a controller and would be great to connect it to my 3ds.

It would be good for when I travel and I wouldn't want to carry my laptop with me everytime to do it...

Just curious if it is possible?

Ps: When we connect the 3ds to our controller with input redirection,do we need to do it everytime or the controller is already connected?