fix(mqtt):handle errors when no subACK code is received

[hxy7yx]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.67%. Comparing base (d623fff) to head (dc51ba1).
⚠️ Report is 154 commits behind head on main.

Files with missing lines	Patch %	Lines
src/connection/mqtt_client.c	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2539      +/-   ##
==========================================
- Coverage   66.68%   66.67%   -0.01%     
==========================================
  Files         121      121              
  Lines       27577    27581       +4     
==========================================
  Hits        18389    18389              
- Misses       9188     9192       +4     

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