Shelly with Yeeligth ceiling lamp always power on

Hi,

From my point of view it wouldn't get any better when combining two smart systems e.g. your smart ceiling lamp by adding a Shelly.
If you have Life, Neutral and Lamp wire available at the existing switch, you could replace your smart lamp by a generic , or Shelly compatible lamp and then add a Shelly 1 to your switch.
Such you would be able to either control your lamp by Smartphone or wall switch.

Or:

If you have Life, Neutral and Lamp wire available at the existing switch and your smart Lamp can be controled by http commands, then you could add a Shelly 1 to your wall switch, connect the Lamp wire to Life, such that the smart lamp is always energized and then you would be able to control the lamp by Smartphone or existing wall switch, which then would send a http command to your smart lamp to toggle their condition. (this solution is overkill).