It seems you are working with test versions of the OPC UA client app. Could you please confirm the version number?
How does your code look like for writing? What is the error that your DL_WriteNode is giving back when you try to write?
We did some tests with the example out of the CXA_DataLayer library using address strings up to 370 character and writing via DL_WriteNode was working fine. Beware that the data type of the value that should be written needs to fit to the target data type. Further more the address string variable needs to be big enough to be able to hold the complete string (standard string = 80 characters, string(1024) = 1024 characters). Please also do a complete download when data types are changed.
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