Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 57.17%. Comparing base (700856f) to head (24a2933).
⚠️ Report is 206 commits behind head on master.

@@             Coverage Diff              @@
##             master     #219      +/-   ##
============================================
- Coverage     57.21%   57.17%   -0.04%     
+ Complexity     2089     2088       -1     
============================================
  Files           163      163              
  Lines         10908    10908              
  Branches       1573     1573              
============================================
- Hits           6241     6237       -4     
- Misses         4250     4252       +2     
- Partials        417      419       +2     

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Thanks!
Actually, instead of just replace millis with nanos, the class should store the timeout value instead of endTime to avoid the numeric overflow mentioned in the Javadoc of nanoTime(). Would you mind refactoring TCPClient like this?
Also, 3.5 (current master) will take a while before there's a release. You might want to target the 3.4.x branch instead.