Adjustments and fixes for attribute_wrapper merge

Thomas Juergesrequested to merge
2021-04-02T17.33.12-branched_from_master-Adjustments_for_attribute_wrapper into master
  • Added a prototype function mapping
  • Improved exception formatting in some places
  • Removed unneeded opcua import and import opcua where actually needed
  • Correct the login in Initialise
  • Correct the disconnect() call
  • Ping server only if self.connected is True (now that I am thinking about it this modification could make this ping purposeless, please check)
Edited by Thomas Juerges

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