Yes, FulGaz 2.6 onwards works with the Wattbike Atom via bluetooth. Just leave all the settings on default, then jump on and ride.
If it does not change resistance automatically, you will need to update the firmware in the Atom.
At the time of writing (June 2018) Resistance changes automatically, but you won't see what gear you are in. We are working on that with Wattbike