Create firewall service for OPC UA

 > sudo nano /etc/firewalld/services/opc.xml
    <?xml version="1.0" encoding="utf-8"?>
    <service>
       <short>OPC</short>
       <description>OPC</description>
       <port protocol="tcp" port="4840"/>
       <port protocol="tcp" port="4843"/>         
       <port protocol="tcp" port="51210-51211"/>   
       <port protocol="tcp" port="61210-61211"/>    
       <port protocol="tcp" port="62540-62553"/>                    
    </service>
 > sudo chmod 640 /etc/firewalld/services/opc.xml
 > sudo firewall-cmd --permanent --add-service=opc
 

Create firewall service for Node Red

 > sudo nano /etc/firewalld/services/nodered.xml
    <?xml version="1.0" encoding="utf-8"?>
    <service>
       <short>nodered</short>
       <description>Node Red</description>
       <port protocol="tcp" port="1880"/>
    </service>
 > sudo chmod 640 /etc/firewalld/services/nodered.xml
 > sudo firewall-cmd --permanent --add-service=nodered
 

 > bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)
 > node-red-start