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Reconnect to existing session not handled correctly #202

@ralphlange

Description

@ralphlange

Describe the bug
We have seen cases where ^C on the IOC and a quick reconnect to an S7-1500 PLC led to all nodes added a second time to the (still) existing subscription.

Not sure how to reproduce (yet).

Setup:

  • OPCUA Support: v0.11.2
  • Platform: RHEL8.5
  • EPICS Base: 7.0.9
  • Client library: UA SDK 1.7.4
  • Server: S7-1500

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