SIANXSVC-1058 stability improvements

[PatrickTaibel]

Several stability improvements. Those changes are already part of draft release .v3

See commits for details

[codecov-commenter]

Codecov Report

Patch coverage: 32.75% and project coverage change: +0.29% 🎉

Comparison is base (5ed8952) 42.49% compared to head (5e4fd39) 42.78%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           anexia       #7      +/-   ##
==========================================
+ Coverage   42.49%   42.78%   +0.29%     
==========================================
  Files          17       17              
  Lines        1572     1587      +15     
==========================================
+ Hits          668      679      +11     
- Misses        852      857       +5     
+ Partials       52       51       -1     

Files Changed	Coverage Δ
client.go	18.53% <0.00%> (+0.40%)	⬆️
main/config.go	41.17% <ø> (ø)
main/main.go	0.00% <0.00%> (ø)
protocol/protocol.go	71.86% <0.00%> (+0.81%)	⬆️
connection/connection.go	64.53% <66.66%> (-0.13%)	⬇️
connection/connection_pool.go	79.77% <66.66%> (+3.68%)	⬆️
server.go	16.97% <87.50%> (+1.94%)	⬆️

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