improve get_own_ip

[TAlonglong]

Closes #51

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.97%. Comparing base (b041234) to head (4760d73).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   88.73%   88.97%   +0.23%     
==========================================
  Files          26       26              
  Lines        2611     2648      +37     
==========================================
+ Hits         2317     2356      +39     
+ Misses        294      292       -2     

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[TAlonglong]

Any views on this?

The test are simple unit test and not part of the pubsub.