Migrate paho to api v2

[hyperspacex2]

• updated affected callbacks according to paho migration guide

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.90%. Comparing base (efb06af) to head (63bb785).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   95.83%   95.90%   +0.07%     
==========================================
  Files           5        5              
  Lines         168      171       +3     
==========================================
+ Hits          161      164       +3     
  Misses          7        7              

Flag	Coverage Δ
unittests	95.90% <100.00%> (+0.07%)	⬆️

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[amotl]

Thank you very much, and apologies for the delay.