reduce serial com port checks

[robamu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.13%. Comparing base (69223ba) to head (0093a0d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tmtccmd/com/ser_utils.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
+ Coverage   76.94%   77.13%   +0.18%     
==========================================
  Files          91       91              
  Lines        5761     5747      -14     
==========================================
  Hits         4433     4433              
+ Misses       1328     1314      -14     

Flag	Coverage Δ
unittests	77.13% <33.33%> (+0.18%)	⬆️

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