Does the source timestamp of a DataValue get overridden?

[prathik-quartic]

I start a opcua server and create 20 nodes. I connect to the server as a client and continuously write data to all the 20 nodes at a update interval of 500 milliseconds. I am trying to make sure while writing data each time to all the 20 nodes, they have the same source timestamp. Here is the code snippet that tries to write data to all 20 tags.

async def write_data_to_each_node(node_id, value, source_timestamp):
    print(f"Source Timestamp: {source_timestamp.timestamp() * 1000}")
    datetime_current = datetime.utcnow()
    data_timestamp = int(datetime_current.timestamp() * 1000)
    print(f'writing {str(node_id)} with {value} at {data_timestamp}')

    data_value = ua.DataValue(value)
    data_value.SourceTimestamp = source_timestamp
    # data_value.ServerTimestamp = datetime_current
    node_id.set_value(value)

async def write_data(self, nodes):
    await asyncio.gather(*[write_data_to_each_node(node, values[i], datetime.utcnow()) for i, node in enumerate(nodes)])

When I fetch these data as a client, I observed that the source_timestamp that I assigned to the node was not the same as the source_timestamp of the data fetched.
Is the source_timestamp of the DataValue overridden by the server? Or am I might be missing something?

[oroulet]

It should not be I have seen some merge request touching that lately, maybe there is a bug...

[prathik-quartic]

Oh okay. So how to proceed? Should I create an issue for someone to investigate?

[AndreasHeine]

propably here:

opcua-asyncio/asyncua/common/node.py

Line 220 in 7a86b03

async def write_value(self, value, varianttype=None):

opcua-asyncio/asyncua/common/ua_utils.py

Line 16 in 7a86b03

def value_to_datavalue(val, varianttype=None):

pass a DataValue as value to set_value and it should work ;)

[prathik-quartic]

@AndreasHeine In my code snippet that I mentioned, I am passing the DataValue to set_value.

[AndreasHeine]

in the snipet you make: node_id.set_value(value)
should be: node_id.set_value(data_value)

[prathik-quartic]

Ah damn. My bad. Not sure how I missed such a trivial thing. Thank you @AndreasHeine