My iPad pro will not connect to my keyboard any more. It stopped working

Remove the Smart keyboard from your iPad - and carefully/gently clean the smart connector contacts on both the iPad and keyboard with a soft pencil eraser. Ensure that the contacts are dirt and dust free before reconnecting the two.

If you can't connect your iPad to your Magic Keyboard, Smart Keyboard, or Smart Keyboard Folio - Apple Support

Would this be an Apple Smart or Magic Keyboard - or a Bluetooth Keyboard of some variety?