!
https://support.industry.siemens.com/cs/document/109737901/creating-of-opc-ua-clients-with-net-and-helper-class?dti=0&lc=en-TN
https://support.industry.siemens.com/cs/document/109748892/opc-ua-client-library-for-microsoft-excel?dti=0&lc=en-TN
https://support.industry.siemens.com/cs/document/42014088/programming-an-opc-ua-net-client-with-c-for-the-simatic-net-opc-ua-server?dti=0&lc=en-TN