Write values to multiple nodes at the same time

[vidyarao123]

I have a list of 10 nodeIDs. Usually to update a value we use the .set_value() method. General way of achieving this would be to update them using a for loop and iterate over the list.
I have another list which has 10 integer values. But instead of going through a cyclic way(for loop) I want to update all 10 nodeIDs at the same time from the second list which has it's corresponding values. Is there a way to achieve this ? Is it possible to write values to multiple node IDs at the same time. ?

Thanks

[AndreasHeine]

are you server or client?

[AndreasHeine]

the server does not have a method like this....

instead of node.set_value() you could use:
server.iserver.set_attribute_value(nodeid, datavalue, attr=ua.AttributeIds.Value)
but still you must loop!

python-opcua/opcua/server/internal_server.py

Line 279 in 67e5484

def set_attribute_value(self, nodeid, datavalue, attr=ua.AttributeIds.Value):

[AndreasHeine]

if you have two lists just list(zip(nodeids, values)) together and then loop over it and set the value (set_attribute_value(nodeid, datavalue, attr=ua.AttributeIds.Value))

[vidyarao123]

Hi, I have almost of 30000 tags. So looping over from 1 to 30000 will be a time consuming task. And since I am getting the data from Modbus, iterating one after that will be a tedious task that's why I was wondering if there is a way to write all 30000 tags at once Thanks

[AndreasHeine]

there is no other way on server side...

clients can write multiple nodes with one request but internally we loop over them!

[oroulet]

the fastest methode on server side is write_attrbute (opcua-asyncio only). It write directly to the target dict. But with 30000 nodes you might be over what Python can do