Fix dropping datagrams from unknown connections on the client endpoint

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.15%. Comparing base (7cf54a5) to head (cd34d22).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #269 +/- ## =========================================== - Coverage 95.15% 95.15% -0.01% =========================================== Files 49 49 Lines 33218 33242 +24 =========================================== + Hits 31609 31631 +22 - Misses 1609 1611 +2 ```

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