fix waiting for netcat to end.

[legacycode]

fix for #67.

[codecov-io]

Codecov Report

Merging #68 into master will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   53.64%   53.79%   +0.14%     
==========================================
  Files          41       41              
  Lines        6949     6949              
  Branches     1732     1732              
==========================================
+ Hits         3728     3738      +10     
+ Misses       2316     2309       -7     
+ Partials      905      902       -3

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