Delivery state described in Kotlin

delivery_state.kt

sealed class DeliveryState: StateType {
    object NotStarted: DeliveryState()
    data class SettingUp (val appId: AppId,
                          val serviceId: ServiceId,
                          val description: ServiceDescription? = null): DeliveryState()
    data class Going (val progress: DeliveryProgress): DeliveryState()
    data class IsIdle (val reason: Idle): DeliveryState()
    data class Failed (val error: Throwable): DeliveryState()
    data class Finished (val status: ServiceStatus): DeliveryState()

    sealed class Idle {
        object WaitingForConnection: Idle()
        object WaitingForServerResponse : Idle()
        object WaitingForNetworkConnection: Idle()
        data class WaitingForReconnect constructor (val deviceId: DeviceId) : Idle()
    }
}