title: Writing a Data to Matrikon OPC UA Server
body: <p>I have using matrikon flex ua sdk server for opc ua server and conect this server via python. I can connect server and get value of a node. But when i want to write a value to a variable in server, it gives me </p>
  
  <blockquote>
    <p>'DataValue object has no attribute set_value'</p>
  </blockquote>
  
  <p>error message. </p>
  
  <p>In the <a href="https://github.com/FreeOpcUa/python-opcua/blob/master/examples/client-example.py" rel="nofollow noreferrer">client_examples.py</a> script , there are examples to write value to server like what i do. Help please?</p>
  
  <p>This is the error: <a href="https://i.stack.imgur.com/8Tvaa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8Tvaa.png" alt="error message"></a></p>