Just associated the fibaro relay switch. I device configuration appears as FGS211 v1.9. It works fine and can be controlled by the Z-cloud interface. The only problem is that in the map appears as it was a dual switch (with the second set of buttons just dead) and its icon does not get yellow when lit. Just to drop a note for future improvements.
marcello
Fibaro FGS 211 V2.1 single switch
Irony
Ironically, if you switch it off or on with the mobile interface (on a different device) the map on the server interface does get update, but the mobile status does not! On the mobile interface the switch appears three time (as switch X, switch X1 and switch X2).
This has it's own reason ;)
This has it's own reason 
The device have no second load, but still shows it's status for second paddle to allow you read the status.
So, it is indeed seen as main device and two instances.
The device have no second load, but still shows it's status for second paddle to allow you read the status.
So, it is indeed seen as main device and two instances.