Fix concurrency issue, add timeout tests, fix client

[Ananto30]

No description provided.

[codecov]

Codecov Report

Patch coverage: 78.89% and project coverage change: +1.56 🎉

Comparison is base (e2c69a9) 75.35% compared to head (3d634b6) 76.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   75.35%   76.92%   +1.56%     
==========================================
  Files          12       12              
  Lines         349      455     +106     
==========================================
+ Hits          263      350      +87     
- Misses         86      105      +19     

Impacted Files	Coverage Δ
zero/codegen.py	41.17% <ø> (ø)
zero/logger.py	0.00% <ø> (ø)
zero/subscriber.py	100.00% <ø> (ø)
zero/server.py	63.24% <40.62%> (+2.04%)	⬆️
zero/zero_mq.py	52.63% <43.47%> (+1.46%)	⬆️
zero/client.py	91.27% <90.90%> (-8.73%)	⬇️
zero/__init__.py	100.00% <100.00%> (ø)
zero/error.py	100.00% <100.00%> (ø)
zero/generate_client.py	89.47% <100.00%> (-10.53%)	⬇️
zero/type_util.py	87.50% <100.00%> (ø)
... and 1 more

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