Thanks.

with 1.1940:
/json.htm?type=command&param=udevice&idx=8&svalue=Off works
/json.htm?type=command&param=udevice&idx=8&svalue=On does not work

plus I cannot find the correct command to update virtual dimmers.

I have a requirement for the exact same functionality.

I have a script that gets the real states of the devices. I want to update the domoticz switches and dimmers status accordingly, without issuing a command.

The param=udevice parameter of the json api doesn't seem to help either.

Thank you for your prompt reply.

'ls -l /usr/bin/python' showed no results.

'sudo apt-get install python' installed python successfully.

All my python scripts are now running fine.

Minor issue: The only python script that is still failing is the above example script. The 'example.log' file ...

I tried again and works fine for me.

What I did:
I created a virtual on/off switch.
Put the example.py in ~/domoticz/scripts
Made the example.py executable
Added the full path to the scripts to the "On Action" like this : script:///home/pi/domoticz/scripts/example.py
Triggered the switch to ...