TouchOSC is a remote control app for iOS and Android that can be used to remotely control a SmartFade console via MIDI.
It sends MIDI commands to a host PC via WiFi, which then forwards them to your SmartFade as 'real' MIDI.
You'll need a suitable MIDI adapter (eg USB MIDI device) and a suitable MIDI software bridge to output the TouchOSC MIDI signals, such as TouchOSC bridge.
This should ensure that the WiFi Ethernet MIDI is being directed to a physical MIDI port and back.
Now make sure the SmartFade MIDI In is connected to the MIDI adapter's MIDI Out.
These two TouchOSC layouts were created by ETC SmartFade user Richard Howey: