tests/projects/modbus/modbus_0@modbus/ModbusTCPclient_0@ModbusTCPclient/confnode.xml
SVGHMI: add warning_labels, same as optional_labels but emits warnings at build time if element is missing.
<?xml version='1.0' encoding='utf-8'?>
<ModbusTCPclient xmlns:xsd="http://www.w3.org/2001/XMLSchema" Remote_Port_Number="1502"/>