@Override
    public final void onIncompleteTimerExpired(final int address) {
        //We switch no operation state if the incomplete timer has expired so that we don't wait on the same state if a particular message fails.
        stateSparseArray.put(address, toggleState(getTransport(address), getState(address).getMeshMessage()));
    }
Returns the K2output for a given Network Key matching the received NID

@param networkKey NetworkKey
@param nid        NID
@return {@link SecureUtils.K2Output} or null if the NID doesn't match.
mesh/src/main/java/no/nordicsemi/android/mesh/transport/BaseMeshMessageHandler.java