Write request without StatusCode and SourceTimeStamp

[NoHeinz]

I am currently trying to communicate with a Siemens S7-1500 PLC and they have their own OPC server that I believe doesn't allow the StatusCode and SourceTimeStamp in their packets for write requests(see pictures attached). Read request from python work fine though. Is there anyway to exclude those values in a write request? The prosys client that I am using sends the packets correctly and gets back a successful packet.(see picture attached)
P.S. I'm using a synchronous client but I used the asynchronous client also and it has the same problems
PYTHON CODE

WRITE REQUEST PACKET FROM PYTHON TO PLC

WRITE RESPONSE TO PYTHON PACKET FROM PLC

ERROR TEXT

WRITE REQUEST PACKET FROM PROSYS OPC CLIENT(works)

?

[NoHeinz]

The siemens opc ua server doesn't accept write requests with SourceTimestamp in the Value:DataValue section, I had to change the way it builds the datavalue of the write request in the python package itself in common/ua-utils.py in the value_to_datavalue function:

just by deleting the parameter of SourceTimestamp when instantiating the DataValue for write requests I was successfully writing to the PLC's OPC server. I wish there was a better way to do this but it works for now and I dont believe this messes anything else up since the packet already has a timestamp in the header.

[AndreasHeine]

you could pass a propper datavalue to the write method rather than a value!
working with siemens alot, so if you call write_value(True) some typeguessing and convinience functions com into play (which can lead to your problems...)

we had that already in multiple issues and discussions resolved!

[AndreasHeine]

even if its not asyncua the logic is almost the same:
FreeOpcUa/python-opcua#1159
FreeOpcUa/python-opcua#1069