Binding label to permantly changing value from thread - kotlin

Question

I have a really basic question but I couldn't find an answer to it. I already searched via google for people with similar problems but I didn´t find anything useful.
(e.g. https://github.com/edvin/tornadofx-guide/blob/master/part1/11.%20Editing%20Models%20and%20Validation.md )
I have the following ViewModel
class MasterSizeModel(var size : Int) : ViewModel()
{
val value = bind { size.toProperty() }
}
And inject it into another class, where I do the following:
masterSize.size = order.masterStatSize
masterSize is my model.
Now in a third class, I want to bind the value from the label to a label.
private val recvMaster : Label by fxid("recvMaster")
/*....*/
recvMaster.bind(masterSizeModel.value)
But unfortunately, my attempts are failing completely. I can see size from my ModelView is updating as it should, but the changes are not present in the value nither are they shown in the label.
Edit:
I totally forgot to bind to the textProperty(), but I don´t get any further.
recvMaster.textProperty().bind(masterSizeModel.value/*?*/)
Edit 2:
After the request I add my complete code section:
class Setup : View() {
override val root : VBox by fxml()
/*Adding Buttons and Textfields*/
init {
//Binding all checkboxes to their text field
//Input validation....
//start Button
start.setOnAction {
val masterSize = 0
val masterSizeModel = MasterSizeModel((masterSize))
//Open a socket (see code below)
val req = Requester(ipAdress.text, masterSizeModel)
val reqModel = RequesterModel(SimpleObjectProperty<Requester>(req))
val scope = Scope()
setInScope(reqModel, scope)
setInScope(masterSizeModel, scope)
req.sendOrder(SetupOrder(/*Sending stuff throw the network*/))
val overview = find<Overview>(scope)
replaceWith(overview)
}
}
}
class Overview : View() {
override val root : VBox by fxml()
private val req : RequesterModel by inject()
private val masterSizeModel : MasterSizeModel by inject()
private val recvMaster : Label by fxid("recvMaster")
/*Adding buttons and stuff */
init{
/*A loop that will request stats from the server i keept it very simple so i can resolv the view problem first */
var run= true
val thread = thread(start= true, name="StatRequester"){while(run){req.req.get().sendOrder(StatOrder(OrderType.STAT))}}
//Change the label whenever the number of recived messages ist raised
recvMaster.textProperty().set(masterSizeModel.size.toString())
}
}
class Requester(val address: String = "localhost", var masterSize: MasterSizeModel ) : Sender() {
override val socket: ZMQ.Socket = context.socket(ZMQ.REQ)
override val port = "4993"
init {
socket.connect("$protocol$address:$port")
}
override fun sendOrder(order: Order) {
//ZeroMQ requires special care....
val message = packOrder(order)
val wrapper = packOrder(RequestOrder(order.type, message))
socket.send(wrapper,0)
val orderAsString = socket.recvStr(0)
handleOrder(orderAsString)
}
private fun handleOrder(orderString: String)
{
val orderDedec = unpackOrder<RequestOrder>(orderString)
when(orderDedec.type)
{
OrderType.STAT ->{
val order = unpackOrder<StatOrder>(orderDedec.order)
sleep(5000) //sleep for debugging only
println("$masterSize, ${order.masterStatSize}")
//Here I receive a new value and want to update the label in my view
masterSize.size = order.masterStatSize
}
OrderType.STOP ->{
close()
}
else ->{}
}
}
override fun close() {
socket.close()
context.term()
}
}