Failure with generated Item name

Setup, Configuration and Use Scripts & Rules
1

Hello,

I am using the actual stable version of openhab (2.5.9). I get the following error:

Rule 'Volume Steuerung': An error occurred during the script execution: Could not invoke method: org.eclipse.smarthome.model.script.actions.BusEvent.sendCommand(java.lang.String,java.lang.String) on instance: null

in the logs when executing the following rule:

 rule "Volume Steuerung"
when
    Item MqttSonosBox_Volume changed 
then
//Sonos Gerät festlegen und Items benennen
var String sonosselect = FabiBox_SonosSelect.state.toString
var String sonos = transform("MAP", "FabiBox.map", sonosselect)
val sonoslautstaerke = ScriptServiceUtil.getItemRegistry.getItem(sonos + "_Lautstaerke") as DimmerItem
sendCommand(sonoslautstaerke, MqttSonosBox_Volume.state)
end

What is my failure. Can somebody please point me in the right direction?

Best Regards

Johannes

2

We need to see your Item definitions too.

3

hmm, so that sendCommand() action is looking for two strings …

Is sonoslautstaerke a string variable?
Don’t think so, isn’t that an Item object that you just selected with ScriptServiceUitil?
How about MqttSonosBox_Volume.state, is that a string?
Doubt it, unless it is from a String type Item.

As you’ve got the Item, you may as well use it’s own method, then you’ve only one argument to stringify.
sonoslautstaerke.sendCommand(MqttSonosBox_Volume.state.toString)

4

I suggest simplifying your rule. Remove the sonoslautstaerke variable and use…

sendCommand(sonos + "_Lautstaerke", MqttSonosBox_Volume.state.toString)
5

Super, the problem was the this part: MqttSonosBox_Volume.state.toString
I had to add the .toString.

Thank You!!!