import java.nio.charset.StandardCharsets;
import java.util.Optional;
import javax.xml.transform.TransformerException;
-import org.opendaylight.netconf.api.NetconfMessage;
import org.opendaylight.netconf.api.messages.HelloMessage;
import org.opendaylight.netconf.api.messages.NetconfHelloMessageAdditionalHeader;
+import org.opendaylight.netconf.api.messages.NetconfMessage;
/**
* Customized NetconfMessageToXMLEncoder that serializes additional header with