Change retain related interface/implementation.

[xinyi-xs]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 58.33% and project coverage change: -0.27 ⚠️

Comparison is base (e320beb) 54.42% compared to head (be1e148) 54.16%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
- Coverage   54.42%   54.16%   -0.27%     
==========================================
  Files         120      120              
  Lines       36421    36425       +4     
==========================================
- Hits        19822    19729      -93     
- Misses      16599    16696      +97     

Impacted Files	Coverage Δ
src/supplemental/nanolib/mqtt_db.c	68.63% <58.33%> (-0.47%)	⬇️

... and 16 files with indirect coverage changes

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