Refact cmdTable & Improve code coverage

[xgzlucario]

No description provided.

[codecov]

Codecov Report

Attention: 113 lines in your changes are missing coverage. Please review.

Comparison is base (f9aa275) 45.88% compared to head (5b052a7) 73.57%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #19       +/-   ##
===========================================
+ Coverage   45.88%   73.57%   +27.68%     
===========================================
  Files           4        4               
  Lines         754      791       +37     
===========================================
+ Hits          346      582      +236     
+ Misses        390      172      -218     
- Partials       18       37       +19     

Files	Coverage Δ
server.go	52.17% <66.66%> (+52.17%)	⬆️
codec.go	79.51% <77.41%> (+15.23%)	⬆️
client.go	67.64% <65.95%> (+67.64%)	⬆️
rotom.go	74.23% <57.76%> (+23.15%)	⬆️

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