add limited listener

[ninedraft]

No description provided.

[codecov-commenter]

Codecov Report

Base: 66.56% // Head: 68.52% // Increases project coverage by +1.95% 🎉

Coverage data is based on head (9400f5e) compared to base (d44fd05).
Patch coverage: 87.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   66.56%   68.52%   +1.95%     
==========================================
  Files           8        8              
  Lines         344      359      +15     
==========================================
+ Hits          229      246      +17     
  Misses         94       94              
+ Partials       21       19       -2     

Flag	Coverage Δ
unittests	68.52% <87.50%> (+1.95%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gemax/server.go	85.29% <87.50%> (+0.23%)	⬆️
gemax/client.go	79.68% <0.00%> (+6.25%)	⬆️

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