static byte[] createProxyNonce(@NonNull final byte[] sequenceNumber, final int src, @NonNull final byte[] ivIndex) {
        final ByteBuffer applicationNonceBuffer = ByteBuffer.allocate(13);
        applicationNonceBuffer.put((byte) NONCE_TYPE_PROXY); //Nonce type
        applicationNonceBuffer.put((byte) PAD_PROXY_NONCE); //PAD
        applicationNonceBuffer.put(sequenceNumber);
        applicationNonceBuffer.putShort((short) src);
        applicationNonceBuffer.put(new byte[]{PAD_PROXY_NONCE, PAD_PROXY_NONCE});
        applicationNonceBuffer.put(ivIndex);
        return applicationNonceBuffer.array();
    }
Creates the proxy nonce

@param sequenceNumber Sequence number of the message
@param src            Source address
@return Proxy nonce
mesh/src/main/java/no/nordicsemi/android/mesh/transport/NetworkLayer.java