Also you need some software on your mobile Device. In my case I'm using an iPad.
Be shure that AIRSTEP Lite and WIDI Bud Pro (a Midi Bluetooth Dongle) running with actual firmware. With IOS you need this software for firmware updates:
AIRSTEP Update
WIDI
For customize:
AIRSTEP
and WIDI again
In 'WIDI' control that the BLE role is set to 'Auto (to all BLE MIDI devices)'