Connecting homey pro to Gardena Sileno with Bluetooth

I got a Gardena Sileno life 800, but not with the smart function. Only with Bluetooth. Is there a way to connect to my homey pro. Have tried to seach, and when I use the Gardena app it says it needs a Smart Gateway, that is not in stores anymore.
Is there a way to connect directly to homey?

It says in stock, but not sure if it really is:

Thanks, maybe I can try to order this. But I’m in Norway and when I search the Norwegian Gardena site it doesn’t show.

But if there is a workaround without the smart gateway it would be great.

And I’m also hesitant if the smart gateway fixes it for my “not so smart” SILENO. Anyone who can confirm that they are compatible even for the Bluetooth version?