Is there some more information about this functionality in Domoticz? I'm trying to find a solution for this..

Not sure what version is running, haven't updated it lately. I'll give it a try after I update the ogtw firmware to see if that helps.

Wasn't really sure if it was a problem on the domotics side or not, we'll see!

Looks like a way better solution then the MySensor rgb dimmer, isn't it?

After using the OTGW (usb) with Domoticz for almost a month without issues, I'm facing some strange problems the last days. The returned values for all the sensors (setpoint, boiler, etc) suddenly drop to 0. Checking the logs it looks like this: ... 2015-09-23 08:47:05.954 OTGW: Error 03 2015-09-23 ...