Nikon D600, iPhone 5s, OTG Adapter and USB not working

[rookie]

Hello,

I bought this App for iPhone 5s (IOS: 9.3.2) and OTG adapter and the original Nikon USB cable.
I connected everything, but it won´t work.
The USB button is not there.

Any ideas to that?

Thanks
rookie

[hubaiz]

On IOS only wireless connection is available.
Either with DSLR that have built in wireless (or the Nikon WU-1a/1b adapter) or using the TP-Link MR3040 portable wireless router with the OpenWrt firmware and the ddserver package.