Can't get digital signal from iPad?


I picked up a used Topping D50  and was excited to try my old retired iPad as a streaming device.

Hooked up the camera connecting kit adapter to my iPad 2 (30 pin connector) then used a usb cable to the Topping and I get nothing! Well, the iPad continues to play out of it's speakers as if it's not recognizing the adapter maybe?  

Any ideas?
blkwrxwgn
Not even sure if the 30-pin connection outputs audio at all.  You might need to use the 3.5mm output, but that’s just a guess.  
It's supposed to if you use the camera connection kit that converts it to USB output.  It's supposed to provide a pure digital signal that you can then use with an external DAC.

I can hook up a memory card adapter and that pulls up photos app so it's recognizing adapters but not getting anything audio wise.
I think you can only import to the iPad through the camera kit or sync certain other apple products.
You may need to use a powered usb hub (I had to do this with my iPad Air 2) here’s a video that will provide a solution if that is the case. 

https://www.youtube.com/watch?v=0DKYLBuElng