@NonNull
    @Override
    public String toString() {
        return "IV Index: " + ivIndex + ", IV Update Active: " + isIvUpdateActive;
    }
Construct the IV Index state of the mesh network

@param ivIndex          IV Index of the network.
@param isIvUpdateActive If true IV Update is in progress and false the network is in Normal operation.
@param transitionDate   Time when the last IV Update happened
mesh/src/main/java/no/nordicsemi/android/mesh/IvIndex.java