Control Kodi 17 on iPad 1

On my iPad 1 I have the Kodi remote app installed and I can connect to Kodi 16 (on an old laptop) but not to Kodi 17 (on Nvidia Shield). I can control Kodi 17 with an app on my HTC 10.

The app cannot be updated on the iPad, so I wonder if it is still possible to connect to Kodi 17 with this app. Kodi 17 doesn’t have Zeroconf could that be the reason I can connect? Or is there a setting in Kodi 17 that I need to set to control Kodi with my iPad 1?