Fan speed control for wood fireplace

Need help for that.
I have a wood fireplace at home. Very old controller for ON/OFF and fan speed.
It work only in manual mode, the probe is gone years ago, and I can select 3 different fan speed.
I could use a fibaro switch to turn it On and Off but I would prefer to control fan speed with my phone.
Open to any suggestion; thank you for your help

You could use a Fibaro Dimmer. Set the fan-speed to 3 and use youre phone to dimm the fan-speed. If your fan needs less than 250 watt.

250w I think is too low as limit for the fireplace fan, I will check tomorrow

There is an IR eye on the controller, if it is in reach of Homey then use IR to control the fan.

Or Broadlink…