OPC Server variable updation from OPC client

[sundar_svks]

Hi All,
I am working on OPC server development.
I have the following doubt:

what are all the ways that the OPC UA client can write/update the OPC UA server variable value ?
As per my knowledge, through OPC server's Write() function, the client can update the value.
Any other ways are there ?

[I am facing the following issue:
Third party vendor's UA client is connected to my OPC server and creates the subscription for the variable.
It is trying to update the value in some way, but it is not calling Write() function, with some other server,
it works fine ]

Thanks & Regards,
Sundararajan

[Support Team]

Hi Sundararajan,

The only standard way a client can update a variable value attribute is through the Write service.

In theory the update can also be done through a server specific method executed through the Call service but this is not common.

In addition variable values are updated by internal server logic.

You can use Wireshark to monitor the communication between client and server.

Best Regards,
Unified Automation Support Team