public final void addAppKey(final int position, final String applicationKey) {
        /*if (this.appKeys.contains(applicationKey))
            throw new IllegalArgumentException("App key already exists");*/

        this.appKeys.add(position, applicationKey);
        saveApplicationKeys();
    }
Adds an application key to the application keys list

@param position       Position would be used as the key for the application key. Also during configuration steps position value would be used as the index for the application key index.
@param applicationKey application key to be added in the specified position
mesh/src/main/java/no/nordicsemi/android/mesh/ProvisioningSettings.java