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 95.09%. Comparing base (08924ee) to head (b159ae0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   95.83%   95.09%   -0.75%     
==========================================
  Files           5        5              
  Lines         168      163       -5     
==========================================
- Hits          161      155       -6     
- Misses          7        8       +1     

Flag	Coverage Δ
unittests	95.09% <100.00%> (-0.75%)	⬇️

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