Unable to change variable value to True

[Zouzou1988]

Hello Dears,
I can read data from a server (opc ua device) without any problem. However, i can't write any variables.
Here is my code:

    def set_opcua_data():
        try:
            node = client.get_node("ns=3; i=16847616")
            node.set_value(True)
        except Exception as er:
            print(f"*** Failure: {str(er)}")

Here is the error:

*** Failure: "The server does not support writing the combination of value, status and timestamps provided."(BadWriteNotSupported)

When i use Ua expert, i can read and write to the server!

Your help please :)

[schroeder-]

some server doesn't allow setting the timestamp. you need to set it via DataValue.

datavalue = ua.DataValue(ua.Variant(True, ua.VariantType.Boolean))
node.set_value(datavalue)

[Zouzou1988]

Same issue with your code:

            node = client.get_node("ns=3; i=16847616")
            data_value = ua.DataValue(ua.Variant(True, ua.VariantType.Boolean))
            node.set_value(data_value)

Error: "The server does not support writing the combination of value, status and timestamps provided."(BadWriteNotSupported)

[schroeder-]

Try this:

node.set_attribute(ua.AttributeIds.Value, ua.DataValue(True))

[Zouzou1988]

same error. sorry

[schroeder-]

Are you sure you can write that value? Dod you try it via ua expert?

[Zouzou1988]

it works using uaexpert.

[Zouzou1988]

[AndreasHeine]

why is there a blank after ; in the nodeid?

[Zouzou1988]

why is there a blank after ; in the nodeid?

Do you mean « , »in the description of nodeid on UA expert ? I don’t know

[oroulet]

datavalue = ua.DataValue(ua.Variant(True, ua.VariantType.Boolean))
datavalue.SouceTimestamp = None
datavalaue.ServerTimestamp = None
node.set_value(datavalue)
``

[Zouzou1988]

datavalue = ua.DataValue(ua.Variant(True, ua.VariantType.Boolean))
datavalue.SouceTimestamp = None
datavalaue.ServerTimestamp = None
node.set_value(datavalue)
``

*** Failure: "The server does not support writing the combination of value, status and timestamps provided."(BadWriteNotSupported)

[oroulet]

Try to remove status or add one of the timestamp. That is what the server says is the issue but does not tell us what it wants