We have Savoy House brand ceiling fan/light units in 4 rooms controlled by over under rocker switches on the wall. The switches only turn fan power on and off and ditto for the fan light. No speed control function at wall (have to use pull chain on fan to do that) and no light dimming function at switch (only on and off) or on fan. Our fans did not come with remote controls. The fans were installed in our new house when we moned in in 2018.
Are there any aftermarket zigbee devices that would do both - either a device under ceiling fan cowl OR a zigbee wall switch unit that would respond to Alexa and smart things and control fan on-off and speed and light on off and dimming?
The ceiling fan units are the over head lights in our rooms so it would be nice to control fan and light operation using alexa or ST app or Alexa app.
Unless I’m misunderstanding, The OP wants a wall switch that will control the fan speed. The present dumb switch is just on/off, but they want more than that.