This HTTP command works for me to set the virtual temp sensor to a value of 23.
You need to use the Temperature Item id number of your virtual device.
https://192.168.0.101:17000/v1/method/hub.item.value.set?_id=66058f6c123e4314a6310100&value_int=23
However not sure how helpful this is if at all.
Much more information about the Ezlo HTTP Server API here.