Trigger scene via MQTT

Hello everyone.
I have just managed to control Shelly lights via an RF remote, an RF/MQTT gateway and Node red. Not a direct path but it works.
Now, I would like to control not just one light but all four outdoor lights with a single action on the remote.
I thought I would easily find what I was looking for by creating a scene triggered by an MQTT message but I cannot find this type of trigger in the scenes. That’s why I am turning to you.
Do you have any tips, any tricks to bypass the problem? I would like to use Gladys for this rather than using Node red again (where I think I could fiddle something).
Thanks in advance for your ideas.
Eric

You need to create a fake device in MQTT on Gladys that you can control via NodeRed.
And use this device as a trigger in a scene.