Hello there. I want to connect a Thermostat. Now, I use the capability “Thermostat”. For more informations about the capability: http://docs.smartthings.com/en/latest/capabilities-reference.html#thermostat. Now I want to change the value of an attribute. In the example below I want to change the attribute coolingSetpoint. But the Problem is that I always get null back on the attribute. Can someone help me or tell me where my mistake is?