BetaBetaThe initial UIRawMessage value for this observable.
Optionaloptions: ObservableOptionsOptional configuration for the observable, such as whether the value can be written by the client.
BetaBetaA function that receives the new UIRawMessage value each time the observable changes.
BetaThe callback handle previously returned by subscribe.
Rc
An observable that holds a UIRawMessage value. Listeners are notified whenever the value changes.