Based on the the error message you posted in your original message, I think the real source of your timeout issue is between the client and the gateway. Can you open the project in question in the designer , then go to Project->Properties->Client->Timing-> Read Timeout , change this value to 120,000. I think the issues you are having are with the delay in values updating but its the client that is timeout out not the OPC-UA server. Let me know if this change causes the error messages to go away.