Hi Emme.
Thank you for responding for some more pieces of this puzzel :D
I appreciate your help !!!!!

As i understand is that the ESP8266 is send mqtt message from the rotary swithch to mqtt
But How do i get / see these update in variable "dimmer" i have created in Domoticz.

Dimmer-1 and Rotary ...

Running Domotics 4.9700
ip 192.168.178.200:8080

Wemos D1 firmware v2.0.0-dev12 test image with rotary
with Rotary KY-040 encoder connected to D3 GPIO(0) and D2 GPIO(2)
Ip 192.168.178.110 and at the device tab the rotary switch.

Mqtt:
192.178.178.200:1883

Hi All.
I like to controle my dimmer via ...

Hi Roland.

Maybe you can give me a hint after playing arround for weeks without results connecting a rotary switch to my ESP8266 for dimming function.
The rotery switch is counting up and down in my esp8266 and dimer is working via the slider using you script thank you for that.
But how do i ...

Hi Rhendriks.
Did you Manage to get it working ?

Kind regars Frank Verdonk